Articles | Volume 14, issue 23
https://doi.org/10.5194/bg-14-5607-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/bg-14-5607-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Reconstructing Holocene temperature and salinity variations in the western Baltic Sea region: a multi-proxy comparison from the Little Belt (IODP Expedition 347, Site M0059)
Ulrich Kotthoff
CORRESPONDING AUTHOR
Institute for Geology, University of Hamburg, 20146, Hamburg, Germany
Center of Natural History, University of Hamburg, 20146, Hamburg, Germany
Jeroen Groeneveld
MARUM, Center for Marine Environmental Sciences, University of Bremen, 28359, Bremen, Germany
Jeanine L. Ash
Department of Earth, Planetary, and Space Sciences, UCLA, Los Angeles, 90024,
USA
Anne-Sophie Fanget
Centre for Past Climate Studies, Department of Geoscience, Aarhus University, 8000 Aarhus C, Denmark
Centre de formation et de recherche sur les environnements méditerranées, Université de Perpignan, 66860 Perpignan CEDEX, France
Nadine Quintana Krupinski
Department of Geology, Lund University, 22362 Lund, Sweden
Odile Peyron
Institute of Evolutionary Sciences, UMR 5554, University of Montpellier, 34095 Montpellier CEDEX 05, France
Anna Stepanova
Department of Computer Science and Engineering, Texas A&M University, College Station, 77843,
USA
Jonathan Warnock
Department of Geoscience, Indiana University of Pennsylvania, Indiana, 15705, USA
Niels A. G. M. Van Helmond
Department of Earth Sciences – Geochemistry, Faculty of Geosciences, Utrecht University, P.O. Box 80021, 3508 TA Utrecht, the Netherlands
Benjamin H. Passey
Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, 48109,
USA
Ole Rønø Clausen
Centre for Past Climate Studies, Department of Geoscience, Aarhus University, 8000 Aarhus C, Denmark
Ole Bennike
Geological Survey of Denmark and Greenland, 1350 Copenhagen, Denmark
Elinor Andrén
School of Natural Sciences, Technology and Environmental Studies, Södertörn University, 14189 Huddinge, Sweden
Wojciech Granoszewski
Polish Geological Institute-National Research Institute Krakow, 31-560 Kraków, Poland
Thomas Andrén
School of Natural Sciences, Technology and Environmental Studies, Södertörn University, 14189 Huddinge, Sweden
Helena L. Filipsson
Department of Geology, Lund University, 22362 Lund, Sweden
Marit-Solveig Seidenkrantz
Centre for Past Climate Studies, Department of Geoscience, Aarhus University, 8000 Aarhus C, Denmark
Caroline P. Slomp
Department of Earth Sciences – Geochemistry, Faculty of Geosciences, Utrecht University, P.O. Box 80021, 3508 TA Utrecht, the Netherlands
Thorsten Bauersachs
Christian-Albrechts-Universität, Institute of Geosciences, Department of Organic Geochemistry, 24118 Kiel, Germany
Related authors
Sabine Prader, Ulrich Kotthoff, Francine M.G. McCarthy, Gerhard Schmiedl, Timme H. Donders, and David R. Greenwood
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-511, https://doi.org/10.5194/bg-2017-511, 2018
Manuscript not accepted for further review
Short summary
Short summary
The observed palaeovegetation movement signals probably correspond to several glacial phases of the middle Oligocene and Early Miocene and might be best reflected within peaks of the conifer forests. Glacial phases exposed shallow shelf areas and allowed the spreading of substrate-depending forest formations. Temperature estimates revealing relative stable humid warm temperate conditions. A Sporadic occurred extinct taxon widens the understanding of its distribution pattern during the Cenozoic.
U. Kotthoff, D. R. Greenwood, F. M. G. McCarthy, K. Müller-Navarra, S. Prader, and S. P. Hesselbo
Clim. Past, 10, 1523–1539, https://doi.org/10.5194/cp-10-1523-2014, https://doi.org/10.5194/cp-10-1523-2014, 2014
Joanna Davies, Kirsten Fahl, Matthias Moros, Alice Carter-Champion, Henrieka Detlef, Ruediger Stein, Christof Pearce, and Marit-Solveig Seidenkrantz
The Cryosphere, 18, 3415–3431, https://doi.org/10.5194/tc-18-3415-2024, https://doi.org/10.5194/tc-18-3415-2024, 2024
Short summary
Short summary
Here, we evaluate the use of biomarkers for reconstructing sea ice between 1880 and 2017 from three sediment cores located in a transect across the Northeast Greenland continental shelf. We find that key changes, specifically the decline in sea-ice cover identified in observational records between 1971 and 1984, align with our biomarker reconstructions. This outcome supports the use of biomarkers for longer reconstructions of sea-ice cover in this region.
Dael Sassoon, Nathalie Combourieu-Nebout, Odile Peyron, Adele Bertini, Francesco Toti, Vincent Lebreton, and Marie-Hélène Moncel
EGUsphere, https://doi.org/10.5194/egusphere-2024-1771, https://doi.org/10.5194/egusphere-2024-1771, 2024
Short summary
Short summary
Comparisons of climatic reconstructions of past interglacials MIS 19, 11, 5 with the current interglacial (MIS 1) based on pollen data from a marine core (Alboran Sea) show that, compared with MIS 1, MIS 19 was colder and highly variable, MIS 11 was longer and more stable, and MIS 5 was warmer. While there is no real equivalent to the current interglacial, past interglacials give insights into the sensitivity of the SW Mediterranean to global climatic changes during conditions similar to MIS 1.
Robin Klomp, Olga M. Żygadłowska, Mike S. M. Jetten, Véronique E. Oldham, Niels A. G. M. van Helmond, Caroline P. Slomp, and Wytze K. Lenstra
EGUsphere, https://doi.org/10.5194/egusphere-2024-1706, https://doi.org/10.5194/egusphere-2024-1706, 2024
Short summary
Short summary
In marine sediments, dissolved Mn is present as either Mn(III) or Mn(II). We apply a reactive transport model to geochemical data for a seasonally anoxic and sulfidic coastal basin to determine the pathways of formation and removal of dissolved Mn(III) in the sediment. We demonstrate a critical role for reactions with Fe(II) and show evidence for substantial benthic release of dissolved Mn(III). Given the mobility of Mn(III), these findings have important implications for marine Mn cycling.
Lara F. Pérez, Paul C. Knutz, John R. Hopper, Marit-Solveig Seidenkrantz, Matt O'Regan, and Stephen Jones
Sci. Dril., 33, 33–46, https://doi.org/10.5194/sd-33-33-2024, https://doi.org/10.5194/sd-33-33-2024, 2024
Short summary
Short summary
The Greenland ice sheet is highly sensitive to global warming and a major contributor to sea level rise. In Northeast Greenland, ice–ocean–tectonic interactions are readily observable today, but geological records that illuminate long-term trends are lacking. NorthGreen aims to promote scientific drilling proposals to resolve key scientific questions on past changes in the Northeast Greenland margin that further affected the broader Earth system.
Babette Hoogakker, Catherine Davis, Yi Wang, Stepanie Kusch, Katrina Nilsson-Kerr, Dalton Hardisty, Allison Jacobel, Dharma Reyes Macaya, Nicolaas Glock, Sha Ni, Julio Sepúlveda, Abby Ren, Alexandra Auderset, Anya Hess, Katrina Meissner, Jorge Cardich, Robert Anderson, Christine Barras, Chandranath Basak, Harold Bradbury, Inda Brinkmann, Alexis Castillo, Madelyn Cook, Kassandra Costa, Constance Choquel, Paula Diz, Jonas Donnenfield, Felix Elling, Zeynep Erdem, Helena Filipsson, Sebastian Garrido, Julia Gottschalk, Anjaly Govindankutty Menon, Jeroen Groeneveld, Christian Hallman, Ingrid Hendy, Rick Hennekam, Wanyi Lu, Jean Lynch-Stieglitz, Lelia Matos, Alfredo Martínez-García, Giulia Molina, Práxedes Muñoz, Simone Moretti, Jennifer Morford, Sophie Nuber, Svetlana Radionovskaya, Morgan Raven, Christopher Somes, Anja Studer, Kazuyo Tachikawa, Raúl Tapia, Martin Tetard, Tyler Vollmer, Shuzhuang Wu, Yan Zhang, Xin-Yuan Zheng, and Yuxin Zhou
EGUsphere, https://doi.org/10.5194/egusphere-2023-2981, https://doi.org/10.5194/egusphere-2023-2981, 2024
Short summary
Short summary
Paleo-oxygen proxies can extend current records, bound pre-anthropogenic baselines, provide datasets necessary to test climate models under different boundary conditions, and ultimately understand how ocean oxygenation responds on longer timescales. Here we summarize current proxies used for the reconstruction of Cenozoic seawater oxygen levels. This includes an overview of the proxy's history, how it works, resources required, limitations, and future recommendations.
K. Mareike Paul, Martijn Hermans, Sami A. Jokinen, Inda Brinkmann, Helena L. Filipsson, and Tom Jilbert
Biogeosciences, 20, 5003–5028, https://doi.org/10.5194/bg-20-5003-2023, https://doi.org/10.5194/bg-20-5003-2023, 2023
Short summary
Short summary
Seawater naturally contains trace metals such as Mo and U, which accumulate under low oxygen conditions on the seafloor. Previous studies have used sediment Mo and U contents as an archive of changing oxygen concentrations in coastal waters. Here we show that in fjords the use of Mo and U for this purpose may be impaired by additional processes. Our findings have implications for the reliable use of Mo and U to reconstruct oxygen changes in fjords.
Léa d'Oliveira, Lucas Dugerdil, Guillemette Ménot, Allowen Evin, Serge D. Muller, Salomé Ansanay-Alex, Julien Azuara, Colline Bonnet, Laurent Bremond, Mehmet Shah, and Odile Peyron
Clim. Past, 19, 2127–2156, https://doi.org/10.5194/cp-19-2127-2023, https://doi.org/10.5194/cp-19-2127-2023, 2023
Short summary
Short summary
In southern Europe, Holocene climate variability is characterized by a strong heterogeneity whose patterns are still poorly understood. Here, a multi-proxy approach (pollen and biomarkers) is applied to the Canroute sequence to reconstruct the climatic variation over the last 15 000 years in southern Massif Central, France. Results reveal that reconstructions of regional climate trends notably differ depending on proxies and sites, notably concerning the presence of a Holocene thermal maximum.
Jonathan Obrist-Farner, Andreas Eckert, Peter M. J. Douglas, Liseth Perez, Alex Correa-Metrio, Bronwen L. Konecky, Thorsten Bauersachs, Susan Zimmerman, Stephanie Scheidt, Mark Brenner, Steffen Kutterolf, Jeremy Maurer, Omar Flores, Caroline M. Burberry, Anders Noren, Amy Myrbo, Matthew Lachniet, Nigel Wattrus, Derek Gibson, and the LIBRE scientific team
Sci. Dril., 32, 85–100, https://doi.org/10.5194/sd-32-85-2023, https://doi.org/10.5194/sd-32-85-2023, 2023
Short summary
Short summary
In August 2022, 65 scientists from 13 countries gathered in Antigua, Guatemala, for a workshop, co-funded by the US National Science Foundation and the International Continental Scientific Drilling Program. This workshop considered the potential of establishing a continental scientific drilling program in the Lake Izabal Basin, eastern Guatemala, with the goals of establishing a borehole observatory and investigating one of the longest continental records from the northern Neotropics.
Ulrike Herzschuh, Thomas Böhmer, Manuel Chevalier, Raphaël Hébert, Anne Dallmeyer, Chenzhi Li, Xianyong Cao, Odile Peyron, Larisa Nazarova, Elena Y. Novenko, Jungjae Park, Natalia A. Rudaya, Frank Schlütz, Lyudmila S. Shumilovskikh, Pavel E. Tarasov, Yongbo Wang, Ruilin Wen, Qinghai Xu, and Zhuo Zheng
Clim. Past, 19, 1481–1506, https://doi.org/10.5194/cp-19-1481-2023, https://doi.org/10.5194/cp-19-1481-2023, 2023
Short summary
Short summary
A mismatch between model- and proxy-based Holocene climate change may partially originate from the poor spatial coverage of climate reconstructions. Here we investigate quantitative reconstructions of mean annual temperature and annual precipitation from 1908 pollen records in the Northern Hemisphere. Trends show strong latitudinal patterns and differ between (sub-)continents. Our work contributes to a better understanding of the global mean.
Rodrigo Martínez-Abarca, Michelle Abstein, Frederik Schenk, David Hodell, Philipp Hoelzmann, Mark Brenner, Steffen Kutterolf, Sergio Cohuo, Laura Macario-González, Mona Stockhecke, Jason Curtis, Flavio S. Anselmetti, Daniel Ariztegui, Thomas Guilderson, Alexander Correa-Metrio, Thorsten Bauersachs, Liseth Pérez, and Antje Schwalb
Clim. Past, 19, 1409–1434, https://doi.org/10.5194/cp-19-1409-2023, https://doi.org/10.5194/cp-19-1409-2023, 2023
Short summary
Short summary
Lake Petén Itzá, northern Guatemala, is one of the oldest lakes in the northern Neotropics. In this study, we analyzed geochemical and mineralogical data to decipher the hydrological response of the lake to climate and environmental changes between 59 and 15 cal ka BP. We also compare the response of Petén Itzá with other regional records to discern the possible climate forcings that influenced them. Short-term climate oscillations such as Greenland interstadials and stadials are also detected.
Ulrike Herzschuh, Thomas Böhmer, Chenzhi Li, Manuel Chevalier, Raphaël Hébert, Anne Dallmeyer, Xianyong Cao, Nancy H. Bigelow, Larisa Nazarova, Elena Y. Novenko, Jungjae Park, Odile Peyron, Natalia A. Rudaya, Frank Schlütz, Lyudmila S. Shumilovskikh, Pavel E. Tarasov, Yongbo Wang, Ruilin Wen, Qinghai Xu, and Zhuo Zheng
Earth Syst. Sci. Data, 15, 2235–2258, https://doi.org/10.5194/essd-15-2235-2023, https://doi.org/10.5194/essd-15-2235-2023, 2023
Short summary
Short summary
Climate reconstruction from proxy data can help evaluate climate models. We present pollen-based reconstructions of mean July temperature, mean annual temperature, and annual precipitation from 2594 pollen records from the Northern Hemisphere, using three reconstruction methods (WA-PLS, WA-PLS_tailored, and MAT). Since no global or hemispheric synthesis of quantitative precipitation changes are available for the Holocene so far, this dataset will be of great value to the geoscientific community.
Alistair J. Monteath, Matthew S. M. Bolton, Jordan Harvey, Marit-Solveig Seidenkrantz, Christof Pearce, and Britta Jensen
Geochronology, 5, 229–240, https://doi.org/10.5194/gchron-5-229-2023, https://doi.org/10.5194/gchron-5-229-2023, 2023
Short summary
Short summary
Accurately dating ocean cores is challenging because the radiocarbon age of water masses varies substantially. We identify ash fragments from eruptions more than 4000 km from their source and use these time markers to develop a new age–depth model for an ocean core in Placentia Bay, North Atlantic. Our results show that the radiocarbon age of waters masses in the bay varied considerably during the last 10 000 years and highlight the potential of using ultra-distal ash deposits in this region.
Mary Robles, Odile Peyron, Guillemette Ménot, Elisabetta Brugiapaglia, Sabine Wulf, Oona Appelt, Marion Blache, Boris Vannière, Lucas Dugerdil, Bruno Paura, Salomé Ansanay-Alex, Amy Cromartie, Laurent Charlet, Stephane Guédron, Jacques-Louis de Beaulieu, and Sébastien Joannin
Clim. Past, 19, 493–515, https://doi.org/10.5194/cp-19-493-2023, https://doi.org/10.5194/cp-19-493-2023, 2023
Short summary
Short summary
Quantitative climate reconstructions based on pollen and brGDGTs reveal, for the Late Glacial, a warm Bølling–Allerød and a marked cold Younger Dryas in Italy, showing no latitudinal differences in terms of temperatures across Italy. In terms of precipitation, no latitudinal differences are recorded during the Bølling–Allerød, whereas 40–42° N appears as a key junction point between wetter conditions in southern Italy and drier conditions in northern Italy during the Younger Dryas.
Wout Krijgsman, Iuliana Vasiliev, Anouk Beniest, Timothy Lyons, Johanna Lofi, Gabor Tari, Caroline P. Slomp, Namik Cagatay, Maria Triantaphyllou, Rachel Flecker, Dan Palcu, Cecilia McHugh, Helge Arz, Pierre Henry, Karen Lloyd, Gunay Cifci, Özgür Sipahioglu, Dimitris Sakellariou, and the BlackGate workshop participants
Sci. Dril., 31, 93–110, https://doi.org/10.5194/sd-31-93-2022, https://doi.org/10.5194/sd-31-93-2022, 2022
Short summary
Short summary
BlackGate seeks to MSP drill a transect to study the impact of dramatic hydrologic change in Mediterranean–Black Sea connectivity by recovering the Messinian to Holocene (~ 7 Myr) sedimentary sequence in the North Aegean, Marmara, and Black seas. These archives will reveal hydrographic, biotic, and climatic transitions studied by a broad scientific community spanning the stratigraphic, tectonic, biogeochemical, and microbiological evolution of Earth’s most recent saline and anoxic giant.
Raúl Tapia, Sze Ling Ho, Hui-Yu Wang, Jeroen Groeneveld, and Mahyar Mohtadi
Biogeosciences, 19, 3185–3208, https://doi.org/10.5194/bg-19-3185-2022, https://doi.org/10.5194/bg-19-3185-2022, 2022
Short summary
Short summary
We report census counts of planktic foraminifera in depth-stratified plankton net samples off Indonesia. Our results show that the vertical distribution of foraminifera species routinely used in paleoceanographic reconstructions varies in hydrographically distinct regions, likely in response to food availability. Consequently, the thermal gradient based on mixed layer and thermocline dwellers also differs for these regions, suggesting potential implications for paleoceanographic reconstructions.
Mimmi Oksman, Anna Bang Kvorning, Signe Hillerup Larsen, Kristian Kjellerup Kjeldsen, Kenneth David Mankoff, William Colgan, Thorbjørn Joest Andersen, Niels Nørgaard-Pedersen, Marit-Solveig Seidenkrantz, Naja Mikkelsen, and Sofia Ribeiro
The Cryosphere, 16, 2471–2491, https://doi.org/10.5194/tc-16-2471-2022, https://doi.org/10.5194/tc-16-2471-2022, 2022
Short summary
Short summary
One of the questions facing the cryosphere community today is how increasing runoff from the Greenland Ice Sheet impacts marine ecosystems. To address this, long-term data are essential. Here, we present multi-site records of fjord productivity for SW Greenland back to the 19th century. We show a link between historical freshwater runoff and productivity, which is strongest in the inner fjord – influenced by marine-terminating glaciers – where productivity has increased since the late 1990s.
Inda Brinkmann, Christine Barras, Tom Jilbert, Tomas Næraa, K. Mareike Paul, Magali Schweizer, and Helena L. Filipsson
Biogeosciences, 19, 2523–2535, https://doi.org/10.5194/bg-19-2523-2022, https://doi.org/10.5194/bg-19-2523-2022, 2022
Short summary
Short summary
The concentration of the trace metal barium (Ba) in coastal seawater is a function of continental input, such as riverine discharge. Our geochemical records of the severely hot and dry year 2018, and following wet year 2019, reveal that prolonged drought imprints with exceptionally low Ba concentrations in benthic foraminiferal calcium carbonates of coastal sediments. This highlights the potential of benthic Ba / Ca to trace past climate extremes and variability in coastal marine records.
Karol Kuliński, Gregor Rehder, Eero Asmala, Alena Bartosova, Jacob Carstensen, Bo Gustafsson, Per O. J. Hall, Christoph Humborg, Tom Jilbert, Klaus Jürgens, H. E. Markus Meier, Bärbel Müller-Karulis, Michael Naumann, Jørgen E. Olesen, Oleg Savchuk, Andreas Schramm, Caroline P. Slomp, Mikhail Sofiev, Anna Sobek, Beata Szymczycha, and Emma Undeman
Earth Syst. Dynam., 13, 633–685, https://doi.org/10.5194/esd-13-633-2022, https://doi.org/10.5194/esd-13-633-2022, 2022
Short summary
Short summary
The paper covers the aspects related to changes in carbon, nitrogen, and phosphorus (C, N, P) external loads; their transformations in the coastal zone; changes in organic matter production (eutrophication) and remineralization (oxygen availability); and the role of sediments in burial and turnover of C, N, and P. Furthermore, this paper also focuses on changes in the marine CO2 system, the structure of the microbial community, and the role of contaminants for biogeochemical processes.
Teodora Pados-Dibattista, Christof Pearce, Henrieka Detlef, Jørgen Bendtsen, and Marit-Solveig Seidenkrantz
Clim. Past, 18, 103–127, https://doi.org/10.5194/cp-18-103-2022, https://doi.org/10.5194/cp-18-103-2022, 2022
Short summary
Short summary
We carried out foraminiferal, stable isotope, and sedimentological analyses of a marine sediment core retrieved from the Northeast Greenland shelf. This region is highly sensitive to climate variability because it is swept by the East Greenland Current, which is the main pathway for sea ice and cold waters that exit the Arctic Ocean. The palaeoceanographic reconstruction reveals significant variations in the water masses and in the strength of the East Greenland Current over the last 9400 years.
Lukas Jonkers, Geert-Jan A. Brummer, Julie Meilland, Jeroen Groeneveld, and Michal Kucera
Clim. Past, 18, 89–101, https://doi.org/10.5194/cp-18-89-2022, https://doi.org/10.5194/cp-18-89-2022, 2022
Short summary
Short summary
The variability in the geochemistry among individual foraminifera is used to reconstruct seasonal to interannual climate variability. This method requires that each foraminifera shell accurately records environmental conditions, which we test here using a sediment trap time series. Even in the absence of environmental variability, planktonic foraminifera display variability in their stable isotope ratios that needs to be considered in the interpretation of individual foraminifera data.
Tanya J. R. Lippmann, Michiel H. in 't Zandt, Nathalie N. L. Van der Putten, Freek S. Busschers, Marc P. Hijma, Pieter van der Velden, Tim de Groot, Zicarlo van Aalderen, Ove H. Meisel, Caroline P. Slomp, Helge Niemann, Mike S. M. Jetten, Han A. J. Dolman, and Cornelia U. Welte
Biogeosciences, 18, 5491–5511, https://doi.org/10.5194/bg-18-5491-2021, https://doi.org/10.5194/bg-18-5491-2021, 2021
Short summary
Short summary
This paper is a step towards understanding the basal peat ecosystem beneath the North Sea. Plant remains followed parallel sequences. Methane concentrations were low with local exceptions, with the source likely being trapped pockets of millennia-old methane. Microbial community structure indicated the absence of a biofilter and was diverse across sites. Large carbon stores in the presence of methanogens and in the absence of methanotrophs have the potential to be metabolized into methane.
Torsten Hundebøl Hansen, Ole Rønø Clausen, and Katrine Juul Andresen
Solid Earth, 12, 1719–1747, https://doi.org/10.5194/se-12-1719-2021, https://doi.org/10.5194/se-12-1719-2021, 2021
Short summary
Short summary
We have analysed the role of deep salt layers during tectonic shortening of a group of sedimentary basins buried below the North Sea. Due to the ability of salt to flow over geological timescales, the salt layers are much weaker than the surrounding rocks during tectonic deformation. Therefore, complex structures formed mainly where salt was present in our study area. Our results align with findings from other basins and experiments, underlining the importance of salt tectonics.
Lucas Dugerdil, Sébastien Joannin, Odile Peyron, Isabelle Jouffroy-Bapicot, Boris Vannière, Bazartseren Boldgiv, Julia Unkelbach, Hermann Behling, and Guillemette Ménot
Clim. Past, 17, 1199–1226, https://doi.org/10.5194/cp-17-1199-2021, https://doi.org/10.5194/cp-17-1199-2021, 2021
Short summary
Short summary
Since the understanding of Holocene climate change appears to be a relevant issue for future climate change, the paleoclimate calibrations have to be improved. Here, surface samples from Mongolia and Siberia were analyzed to provide new calibrations for pollen and biomarker climate models. These calibrations appear to be more powerful than global calibrations, especially in an arid central Asian context. These calibrations will improve the understanding of monsoon Holocene oscillations.
Andrew M. Dolman, Torben Kunz, Jeroen Groeneveld, and Thomas Laepple
Clim. Past, 17, 825–841, https://doi.org/10.5194/cp-17-825-2021, https://doi.org/10.5194/cp-17-825-2021, 2021
Short summary
Short summary
Uncertainties in climate proxy records are temporally autocorrelated. By deriving expressions for the power spectra of errors in proxy records, we can estimate appropriate uncertainties for any timescale, for example, for temporally smoothed records or for time slices. Here we outline and demonstrate this approach for climate proxies recovered from marine sediment cores.
Alix G. Cage, Anna J. Pieńkowski, Anne Jennings, Karen Luise Knudsen, and Marit-Solveig Seidenkrantz
J. Micropalaeontol., 40, 37–60, https://doi.org/10.5194/jm-40-37-2021, https://doi.org/10.5194/jm-40-37-2021, 2021
Short summary
Short summary
Morphologically similar benthic foraminifera taxa are difficult to separate, resulting in incorrect identifications, complications understanding species-specific ecological preferences, and flawed reconstructions of past environments. Here we provide descriptions and illustrated guidelines on how to separate some key Arctic–North Atlantic species to circumvent taxonomic confusion, improve understanding of ecological affinities, and work towards more accurate palaeoenvironmental reconstructions.
Annette Hahn, Enno Schefuß, Jeroen Groeneveld, Charlotte Miller, and Matthias Zabel
Clim. Past, 17, 345–360, https://doi.org/10.5194/cp-17-345-2021, https://doi.org/10.5194/cp-17-345-2021, 2021
Constance Choquel, Emmanuelle Geslin, Edouard Metzger, Helena L. Filipsson, Nils Risgaard-Petersen, Patrick Launeau, Manuel Giraud, Thierry Jauffrais, Bruno Jesus, and Aurélia Mouret
Biogeosciences, 18, 327–341, https://doi.org/10.5194/bg-18-327-2021, https://doi.org/10.5194/bg-18-327-2021, 2021
Short summary
Short summary
Marine microorganisms such as foraminifera are able to live temporarily without oxygen in sediments. In a Swedish fjord subjected to seasonal oxygen scarcity, a change in fauna linked to the decrease in oxygen and the increase in an invasive species was shown. The invasive species respire nitrate until 100 % of the nitrate porewater in the sediment and could be a major contributor to nitrogen balance in oxic coastal ecosystems. But prolonged hypoxia creates unfavorable conditions to survive.
Martijn Hermans, Nils Risgaard-Petersen, Filip J. R. Meysman, and Caroline P. Slomp
Biogeosciences, 17, 5919–5938, https://doi.org/10.5194/bg-17-5919-2020, https://doi.org/10.5194/bg-17-5919-2020, 2020
Short summary
Short summary
This paper demonstrates that the recently discovered cable bacteria are capable of using a mineral, known as siderite, as a source for the formation of iron oxides. This work also demonstrates that the activity of cable bacteria can lead to a distinct subsurface layer in the sediment that can be used as a marker for their activity.
Vann Smith, Sophie Warny, Kliti Grice, Bettina Schaefer, Michael T. Whalen, Johan Vellekoop, Elise Chenot, Sean P. S. Gulick, Ignacio Arenillas, Jose A. Arz, Thorsten Bauersachs, Timothy Bralower, François Demory, Jérôme Gattacceca, Heather Jones, Johanna Lofi, Christopher M. Lowery, Joanna Morgan, Noelia B. Nuñez Otaño, Jennifer M. K. O'Keefe, Katherine O'Malley, Francisco J. Rodríguez-Tovar, Lorenz Schwark, and the IODP–ICDP Expedition 364 Scientists
Clim. Past, 16, 1889–1899, https://doi.org/10.5194/cp-16-1889-2020, https://doi.org/10.5194/cp-16-1889-2020, 2020
Short summary
Short summary
A rare tropical record of the Paleocene–Eocene Thermal Maximum, a potential analog for future global warming, has been identified from post-impact strata in the Chicxulub crater. Multiproxy analysis has yielded evidence for increased humidity, increased pollen and fungi input, salinity stratification, bottom water anoxia, and sea surface temperatures up to 38 °C. Pollen and plant spore assemblages indicate a nearby diverse coastal shrubby tropical forest resilient to hyperthermal conditions.
Katrine Elnegaard Hansen, Jacques Giraudeau, Lukas Wacker, Christof Pearce, and Marit-Solveig Seidenkrantz
Clim. Past, 16, 1075–1095, https://doi.org/10.5194/cp-16-1075-2020, https://doi.org/10.5194/cp-16-1075-2020, 2020
Short summary
Short summary
In this study, we present RainNet, a deep convolutional neural network for radar-based precipitation nowcasting, which was trained to predict continuous precipitation intensities at a lead time of 5 min. RainNet significantly outperformed the benchmark models at all lead times up to 60 min. Yet an undesirable property of RainNet predictions is the level of spatial smoothing. Obviously, RainNet learned an optimal level of smoothing to produce a nowcast at 5 min lead time.
Niels A. G. M. van Helmond, Elizabeth K. Robertson, Daniel J. Conley, Martijn Hermans, Christoph Humborg, L. Joëlle Kubeneck, Wytze K. Lenstra, and Caroline P. Slomp
Biogeosciences, 17, 2745–2766, https://doi.org/10.5194/bg-17-2745-2020, https://doi.org/10.5194/bg-17-2745-2020, 2020
Short summary
Short summary
We studied the removal of phosphorus (P) and nitrogen (N) in the eutrophic Stockholm archipelago (SA). High sedimentation rates and sediment P contents lead to high P burial. Benthic denitrification is the primary nitrate-reducing pathway. Together, these mechanisms limit P and N transport to the open Baltic Sea. We expect that further nutrient load reduction will contribute to recovery of the SA from low-oxygen conditions and that the sediments will continue to remove part of the P and N loads.
Julien Richirt, Bettina Riedel, Aurélia Mouret, Magali Schweizer, Dewi Langlet, Dorina Seitaj, Filip J. R. Meysman, Caroline P. Slomp, and Frans J. Jorissen
Biogeosciences, 17, 1415–1435, https://doi.org/10.5194/bg-17-1415-2020, https://doi.org/10.5194/bg-17-1415-2020, 2020
Short summary
Short summary
The paper presents the response of benthic foraminiferal communities to seasonal absence of oxygen coupled with the presence of hydrogen sulfide, considered very harmful for several living organisms.
Our results suggest that the foraminiferal community mainly responds as a function of the duration of the adverse conditions.
This knowledge is especially useful to better understand the ecology of benthic foraminifera but also in the context of palaeoceanographic interpretations.
Lucas Dugerdil, Sébastien Joannin, Odile Peyron, Isabelle Jouffroy-Bapicot, Boris Vannière, Bazartseren Boldgiv, and Guillemette Ménot
Biogeosciences Discuss., https://doi.org/10.5194/bg-2019-475, https://doi.org/10.5194/bg-2019-475, 2020
Preprint withdrawn
Laurie M. Charrieau, Karl Ljung, Frederik Schenk, Ute Daewel, Emma Kritzberg, and Helena L. Filipsson
Biogeosciences, 16, 3835–3852, https://doi.org/10.5194/bg-16-3835-2019, https://doi.org/10.5194/bg-16-3835-2019, 2019
Short summary
Short summary
We reconstructed environmental changes in the Öresund during the last 200 years, using foraminifera (microfossils), sediment, and climate data. Five zones were identified, reflecting oxygen, salinity, food content, and pollution levels for each period. The largest changes occurred ~ 1950, towards stronger currents. The foraminifera responded quickly (< 10 years) to the changes. Moreover, they did not rebound when the system returned to the previous pattern, but displayed a new equilibrium state.
Flor Vermassen, Nanna Andreasen, David J. Wangner, Nicolas Thibault, Marit-Solveig Seidenkrantz, Rebecca Jackson, Sabine Schmidt, Kurt H. Kjær, and Camilla S. Andresen
Clim. Past, 15, 1171–1186, https://doi.org/10.5194/cp-15-1171-2019, https://doi.org/10.5194/cp-15-1171-2019, 2019
Short summary
Short summary
By studying microfossils from sediments in Upernavik Fjord we investigate the role of ocean warming on the retreat of Upernavik Isstrøm during the past ~90 years. The reconstruction of Atlantic-derived waters shows a pattern similar to that of the Atlantic Multidecadal Oscillation, corroborating previous studies. The response of Upernavik Isstrøm to ocean forcing has been variable in the past, but the current retreat may be temporarily tempered by cooling bottom waters in the coming decade.
Monica Bini, Giovanni Zanchetta, Aurel Perşoiu, Rosine Cartier, Albert Català, Isabel Cacho, Jonathan R. Dean, Federico Di Rita, Russell N. Drysdale, Martin Finnè, Ilaria Isola, Bassem Jalali, Fabrizio Lirer, Donatella Magri, Alessia Masi, Leszek Marks, Anna Maria Mercuri, Odile Peyron, Laura Sadori, Marie-Alexandrine Sicre, Fabian Welc, Christoph Zielhofer, and Elodie Brisset
Clim. Past, 15, 555–577, https://doi.org/10.5194/cp-15-555-2019, https://doi.org/10.5194/cp-15-555-2019, 2019
Short summary
Short summary
The Mediterranean region has returned some of the clearest evidence of a climatically dry period occurring approximately 4200 years ago. We reviewed selected proxies to infer regional climate patterns between 4.3 and 3.8 ka. Temperature data suggest a cooling anomaly, even if this is not uniform, whereas winter was drier, along with dry summers. However, some exceptions to this prevail, where wetter condition seems to have persisted, suggesting regional heterogeneity.
Erik Gustafsson, Mathilde Hagens, Xiaole Sun, Daniel C. Reed, Christoph Humborg, Caroline P. Slomp, and Bo G. Gustafsson
Biogeosciences, 16, 437–456, https://doi.org/10.5194/bg-16-437-2019, https://doi.org/10.5194/bg-16-437-2019, 2019
Short summary
Short summary
This work highlights that iron (Fe) dynamics plays a key role in the release of alkalinity from sediments, as exemplified for the Baltic Sea. It furthermore demonstrates that burial of Fe sulfides should be included in alkalinity budgets of low-oxygen basins. The sedimentary alkalinity generation may undergo large changes depending on both organic matter loads and oxygen conditions. Enhanced release of alkalinity from the seafloor can increase the CO2 storage capacity of seawater.
Gaia Sinopoli, Odile Peyron, Alessia Masi, Jens Holtvoeth, Alexander Francke, Bernd Wagner, and Laura Sadori
Clim. Past, 15, 53–71, https://doi.org/10.5194/cp-15-53-2019, https://doi.org/10.5194/cp-15-53-2019, 2019
Short summary
Short summary
Climate changes occur today as they occurred in the past. This study deals with climate changes reconstructed at Lake Ohrid (Albania and FYROM) between 160 000 and 70 000 years ago. Climate reconstruction, based on a high-resolution pollen study, provides quantitative estimates of past temperature and precipitation. Our data show an alternation of cold/dry and warm/wet periods. The last interglacial appears to be characterized by temperatures higher than nowadays.
Wytze K. Lenstra, Matthias Egger, Niels A. G. M. van Helmond, Emma Kritzberg, Daniel J. Conley, and Caroline P. Slomp
Biogeosciences, 15, 6979–6996, https://doi.org/10.5194/bg-15-6979-2018, https://doi.org/10.5194/bg-15-6979-2018, 2018
Short summary
Short summary
We show that burial rates of phosphorus (P) in an estuary in the northern Baltic Sea are very high. We demonstrate that at high sedimentation rates, P retention in the sediment is related to the formation of vivianite. With a reactive transport model, we assess the sensitivity of sedimentary vivianite formation. We suggest that enrichments of iron and P in the sediment are linked to periods of enhanced riverine input of Fe, which subsequently strongly enhances P burial in coastal sediments.
Andrea Fischel, Marit-Solveig Seidenkrantz, and Bent Vad Odgaard
J. Micropalaeontol., 37, 499–518, https://doi.org/10.5194/jm-37-499-2018, https://doi.org/10.5194/jm-37-499-2018, 2018
Short summary
Short summary
Benthic foraminifera often colonize marine underwater vegetation in tropical regions. We studied these so-called epiphytic foraminifera in a shallow bay in the Bahamas. Here the foraminifera differed between types of vegetation, but sedimentological processes seem to be the main controller of the dead foraminifera in the sediment. This indicates that in carbonate platform regions, epiphytic foraminifera should only be used cautiously as direct indicators of past in situ marine vegetation.
Jeroen Groeneveld, Helena L. Filipsson, William E. N. Austin, Kate Darling, David McCarthy, Nadine B. Quintana Krupinski, Clare Bird, and Magali Schweizer
J. Micropalaeontol., 37, 403–429, https://doi.org/10.5194/jm-37-403-2018, https://doi.org/10.5194/jm-37-403-2018, 2018
Short summary
Short summary
Current climate and environmental changes strongly affect shallow marine and coastal areas like the Baltic Sea. The combination of foraminiferal geochemistry and environmental parameters demonstrates that in a highly variable setting like the Baltic Sea, it is possible to separate different environmental impacts on the foraminiferal assemblages and therefore use chemical factors to reconstruct how seawater temperature, salinity, and oxygen varied in the past and may vary in the future.
Irina Polovodova Asteman, Helena L. Filipsson, and Kjell Nordberg
Clim. Past, 14, 1097–1118, https://doi.org/10.5194/cp-14-1097-2018, https://doi.org/10.5194/cp-14-1097-2018, 2018
Short summary
Short summary
We present 2500 years of winter temperatures, using a sediment record from Gullmar Fjord analyzed for stable oxygen isotopes in benthic foraminifera. Reconstructed temperatures are within the annual temperature variability recorded in the fjord since the 1890s. Results show the warm Roman and Medieval periods and the cold Little Ice Age. The record also shows the recent warming, which does not stand out in the 2500-year perspective and is comparable to the Roman and Medieval climate anomalies.
Timme H. Donders, Niels A. G. M. van Helmond, Roel Verreussel, Dirk Munsterman, Johan ten Veen, Robert P. Speijer, Johan W. H. Weijers, Francesca Sangiorgi, Francien Peterse, Gert-Jan Reichart, Jaap S. Sinninghe Damsté, Lucas Lourens, Gesa Kuhlmann, and Henk Brinkhuis
Clim. Past, 14, 397–411, https://doi.org/10.5194/cp-14-397-2018, https://doi.org/10.5194/cp-14-397-2018, 2018
Short summary
Short summary
The buildup and melting of ice during the early glaciations in the Northern Hemisphere, around 2.5 million years ago, were far shorter in duration than during the last million years. Based on molecular compounds and microfossils from sediments dating back to the early glaciations we show that the temperature on land and in the sea changed simultaneously and was a major factor in the ice buildup in the Northern Hemisphere. These data provide key insights into the dynamics of early glaciations.
Jan-Peter Duda, Volker Thiel, Thorsten Bauersachs, Helge Mißbach, Manuel Reinhardt, Nadine Schäfer, Martin J. Van Kranendonk, and Joachim Reitner
Biogeosciences, 15, 1535–1548, https://doi.org/10.5194/bg-15-1535-2018, https://doi.org/10.5194/bg-15-1535-2018, 2018
Short summary
Short summary
The origin of organic matter in the oldest rocks on Earth is commonly ambiguous (biotic vs. abiotic). This problem culminates in the case of hydrothermal chert veins that contain abundant organic matter. Here we demonstrate a microbial origin of kerogen embedded in a 3.5 Gyr old hydrothermal chert vein. We explain this finding with the large-scale redistribution of biomass by hydrothermal fluids, emphasizing the interplay between biological and abiological processes on the early Earth.
Nikki Dijkstra, Mathilde Hagens, Matthias Egger, and Caroline P. Slomp
Biogeosciences, 15, 861–883, https://doi.org/10.5194/bg-15-861-2018, https://doi.org/10.5194/bg-15-861-2018, 2018
Short summary
Short summary
We show that post-depositional formation of iron(II) phosphate as vivianite strongly alters the phosphorus record in sediments of the Bornholm Basin (Baltic Sea). These minerals began to precipitate in the lake sediments just after the last lake–marine transition ~ 7.5 kyr BP, migrated downwards and are now a stable feature. Formation of vivianite may affect sedimentary phosphorus records in other systems as well. This should be considered when using such records to reconstruct past environments.
Laurie M. Charrieau, Lene Bryngemark, Ingemar Hansson, and Helena L. Filipsson
J. Micropalaeontol., 37, 191–194, https://doi.org/10.5194/jm-37-191-2018, https://doi.org/10.5194/jm-37-191-2018, 2018
Short summary
Short summary
Splitting samples into smaller subsamples is often necessary in micropalaeontological studies. Indeed, the general high abundance of microfossils – which makes them excellent tools to reconstruct past environments – also results in very time-consuming faunal analyses. Here we present an improved and cost-effective wet splitter for micropalaeontological samples aimed to reduce picking time, while keeping information loss to a minimum.
Jassin Petersen, Christine Barras, Antoine Bézos, Carole La, Lennart J. de Nooijer, Filip J. R. Meysman, Aurélia Mouret, Caroline P. Slomp, and Frans J. Jorissen
Biogeosciences, 15, 331–348, https://doi.org/10.5194/bg-15-331-2018, https://doi.org/10.5194/bg-15-331-2018, 2018
Short summary
Short summary
In Lake Grevelingen, a coastal ecosystem, foraminifera experience important temporal variations in oxygen concentration and in pore water manganese. The high resolution of LA-ICP-MS allows us to analyse the chambers of foraminiferal shells separately and to obtain signals from a series of calcification events. We estimate the variability in Mn/Ca observed within single shells due to biomineralization and show that a substantial part of the signal is related to environmental variability.
Sabine Prader, Ulrich Kotthoff, Francine M.G. McCarthy, Gerhard Schmiedl, Timme H. Donders, and David R. Greenwood
Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-511, https://doi.org/10.5194/bg-2017-511, 2018
Manuscript not accepted for further review
Short summary
Short summary
The observed palaeovegetation movement signals probably correspond to several glacial phases of the middle Oligocene and Early Miocene and might be best reflected within peaks of the conifer forests. Glacial phases exposed shallow shelf areas and allowed the spreading of substrate-depending forest formations. Temperature estimates revealing relative stable humid warm temperate conditions. A Sporadic occurred extinct taxon widens the understanding of its distribution pattern during the Cenozoic.
Martin Bartels, Jürgen Titschack, Kirsten Fahl, Rüdiger Stein, Marit-Solveig Seidenkrantz, Claude Hillaire-Marcel, and Dierk Hebbeln
Clim. Past, 13, 1717–1749, https://doi.org/10.5194/cp-13-1717-2017, https://doi.org/10.5194/cp-13-1717-2017, 2017
Short summary
Short summary
Multi-proxy analyses (i.a., benthic foraminiferal assemblages and sedimentary properties) of a marine record from Woodfjorden at the northern Svalbard margin (Norwegian Arctic) illustrate a significant contribution of relatively warm Atlantic water to the destabilization of tidewater glaciers, especially during the deglaciation and early Holocene (until ~ 7800 years ago), whereas its influence on glacier activity has been fading during the last 2 millennia, enabling glacier readvances.
Philipp M. Munz, Stephan Steinke, Anna Böll, Andreas Lückge, Jeroen Groeneveld, Michal Kucera, and Hartmut Schulz
Clim. Past, 13, 491–509, https://doi.org/10.5194/cp-13-491-2017, https://doi.org/10.5194/cp-13-491-2017, 2017
Short summary
Short summary
We present the results of several independent proxies of summer SST and upwelling SST from the Oman margin indicative of monsoon strength during the early Holocene. In combination with indices of carbonate preservation and bottom water redox conditions, we demonstrate that a persistent solar influence was modulating summer monsoon intensity. Furthermore, bottom water conditions are linked to atmospheric forcing, rather than changes of intermediate water masses.
Bernd Wagner, Thomas Wilke, Alexander Francke, Christian Albrecht, Henrike Baumgarten, Adele Bertini, Nathalie Combourieu-Nebout, Aleksandra Cvetkoska, Michele D'Addabbo, Timme H. Donders, Kirstin Föller, Biagio Giaccio, Andon Grazhdani, Torsten Hauffe, Jens Holtvoeth, Sebastien Joannin, Elena Jovanovska, Janna Just, Katerina Kouli, Andreas Koutsodendris, Sebastian Krastel, Jack H. Lacey, Niklas Leicher, Melanie J. Leng, Zlatko Levkov, Katja Lindhorst, Alessia Masi, Anna M. Mercuri, Sebastien Nomade, Norbert Nowaczyk, Konstantinos Panagiotopoulos, Odile Peyron, Jane M. Reed, Eleonora Regattieri, Laura Sadori, Leonardo Sagnotti, Björn Stelbrink, Roberto Sulpizio, Slavica Tofilovska, Paola Torri, Hendrik Vogel, Thomas Wagner, Friederike Wagner-Cremer, George A. Wolff, Thomas Wonik, Giovanni Zanchetta, and Xiaosen S. Zhang
Biogeosciences, 14, 2033–2054, https://doi.org/10.5194/bg-14-2033-2017, https://doi.org/10.5194/bg-14-2033-2017, 2017
Short summary
Short summary
Lake Ohrid is considered to be the oldest existing lake in Europe. Moreover, it has a very high degree of endemic biodiversity. During a drilling campaign at Lake Ohrid in 2013, a 569 m long sediment sequence was recovered from Lake Ohrid. The ongoing studies of this record provide first important information on the environmental and evolutionary history of the lake and the reasons for its high endimic biodiversity.
Odile Peyron, Nathalie Combourieu-Nebout, David Brayshaw, Simon Goring, Valérie Andrieu-Ponel, Stéphanie Desprat, Will Fletcher, Belinda Gambin, Chryssanthi Ioakim, Sébastien Joannin, Ulrich Kotthoff, Katerina Kouli, Vincent Montade, Jörg Pross, Laura Sadori, and Michel Magny
Clim. Past, 13, 249–265, https://doi.org/10.5194/cp-13-249-2017, https://doi.org/10.5194/cp-13-249-2017, 2017
Short summary
Short summary
This study aims to reconstruct the climate evolution of the Mediterranean region during the Holocene from pollen data and model outputs. The model- and pollen-inferred precipitation estimates show overall agreement: the eastern Medit. experienced wetter-than-present summer conditions during the early–late Holocene. This regional climate model highlights how the patchy nature of climate signals and data in the Medit. may lead to stronger local signals than the large-scale pattern suggests.
Wenxin Ning, Jing Tang, and Helena L. Filipsson
Earth Surf. Dynam., 4, 773–780, https://doi.org/10.5194/esurf-4-773-2016, https://doi.org/10.5194/esurf-4-773-2016, 2016
Matthias Egger, Peter Kraal, Tom Jilbert, Fatimah Sulu-Gambari, Célia J. Sapart, Thomas Röckmann, and Caroline P. Slomp
Biogeosciences, 13, 5333–5355, https://doi.org/10.5194/bg-13-5333-2016, https://doi.org/10.5194/bg-13-5333-2016, 2016
Short summary
Short summary
By combining detailed geochemical analyses with diagenetic modeling, we provide new insights into how methane dynamics may strongly overprint burial records of iron, sulfur and phosphorus in marine systems subject to changes in organic matter loading or water column salinity. A better understanding of these processes will improve our ability to read ancient sediment records and thus to predict the potential consequences of global warming and human-enhanced inputs of nutrients to the ocean.
Cornelia Mueller-Niggemann, Sri Rahayu Utami, Anika Marxen, Kai Mangelsdorf, Thorsten Bauersachs, and Lorenz Schwark
Biogeosciences, 13, 1647–1666, https://doi.org/10.5194/bg-13-1647-2016, https://doi.org/10.5194/bg-13-1647-2016, 2016
Laura Sadori, Andreas Koutsodendris, Konstantinos Panagiotopoulos, Alessia Masi, Adele Bertini, Nathalie Combourieu-Nebout, Alexander Francke, Katerina Kouli, Sébastien Joannin, Anna Maria Mercuri, Odile Peyron, Paola Torri, Bernd Wagner, Giovanni Zanchetta, Gaia Sinopoli, and Timme H. Donders
Biogeosciences, 13, 1423–1437, https://doi.org/10.5194/bg-13-1423-2016, https://doi.org/10.5194/bg-13-1423-2016, 2016
Short summary
Short summary
Lake Ohrid (FYROM/Albania) is the deepest, largest and oldest lake in Europe. To understand the climatic and environmental evolution of its area, a palynological study was undertaken for the last 500 ka. We found a correspondence between forested/non-forested periods and glacial-interglacial cycles of marine isotope stratigraphy. Our record shows a progressive change from cooler and wetter to warmer and dryer interglacial conditions. This shift is also visible in glacial vegetation.
B. Gambin, V. Andrieu-Ponel, F. Médail, N. Marriner, O. Peyron, V. Montade, T. Gambin, C. Morhange, D. Belkacem, and M. Djamali
Clim. Past, 12, 273–297, https://doi.org/10.5194/cp-12-273-2016, https://doi.org/10.5194/cp-12-273-2016, 2016
Short summary
Short summary
Based on the study of ancient microfossils, such as pollen and spores, this paper explores climate change in a Mediterranean island context. Using a multi-disciplinary approach this original research corroborates existing archaeological and historical data. It also uses comparative data from elsewhere in the central Mediterranean to ensure that the current research is placed within the appropriate geographic context.
T. Andrén, B. Barker Jørgensen, C. Cotterill, S. Green, and the IODP expedition 347 scientific party
Sci. Dril., 20, 1–12, https://doi.org/10.5194/sd-20-1-2015, https://doi.org/10.5194/sd-20-1-2015, 2015
J. M. Bernhard, W. G. Phalen, A. McIntyre-Wressnig, F. Mezzo, J. C. Wit, M. Jeglinski, and H. L. Filipsson
Biogeosciences, 12, 5515–5522, https://doi.org/10.5194/bg-12-5515-2015, https://doi.org/10.5194/bg-12-5515-2015, 2015
Short summary
Short summary
We present an innovative method using osmotic pumps and the fluorescent marker calcein to help identify where and when calcareous bottom-dwelling organisms mineralize in sediments. These organisms, and their geochemical signatures in their carbonate, are the ocean’s storytellers helping us understand past marine conditions. For many species, the timing and location of their calcite growth is not known. Knowing this will enable us to reconstruct past marine environments with greater accuracy.
C. L. McKay, J. Groeneveld, H. L. Filipsson, D. Gallego-Torres, M. J. Whitehouse, T. Toyofuku, and O.E. Romero
Biogeosciences, 12, 5415–5428, https://doi.org/10.5194/bg-12-5415-2015, https://doi.org/10.5194/bg-12-5415-2015, 2015
Short summary
Short summary
We highlight the proxy potential of foraminiferal Mn/Ca determined by secondary ion mass spectrometry and flow-through inductively coupled plasma optical emission spectroscopy for recording changes in bottom-water oxygen conditions. Comparisons with Mn sediment bulk measurements from the same sediment core largely agree with the results. High foraminiferal Mn/Ca occurs in samples from times of high productivity export and corresponds with the benthic foraminiferal faunal composition.
C. Lenz, T. Jilbert, D.J. Conley, M. Wolthers, and C.P. Slomp
Biogeosciences, 12, 4875–4894, https://doi.org/10.5194/bg-12-4875-2015, https://doi.org/10.5194/bg-12-4875-2015, 2015
T. Bauersachs, J. Rochelmeier, and L. Schwark
Biogeosciences, 12, 3741–3751, https://doi.org/10.5194/bg-12-3741-2015, https://doi.org/10.5194/bg-12-3741-2015, 2015
M. Hagens, C. P. Slomp, F. J. R. Meysman, D. Seitaj, J. Harlay, A. V. Borges, and J. J. Middelburg
Biogeosciences, 12, 1561–1583, https://doi.org/10.5194/bg-12-1561-2015, https://doi.org/10.5194/bg-12-1561-2015, 2015
Short summary
Short summary
This study looks at the combined impacts of hypoxia and acidification, two major environmental stressors affecting coastal systems, in a seasonally stratified basin. Here, the surface water experiences less seasonality in pH than the bottom water despite higher process rates. This is due to a substantial reduction in the acid-base buffering capacity of the bottom water as it turns hypoxic in summer. This highlights the crucial role of the buffering capacity as a modulating factor in pH dynamics.
U. Kotthoff, D. R. Greenwood, F. M. G. McCarthy, K. Müller-Navarra, S. Prader, and S. P. Hesselbo
Clim. Past, 10, 1523–1539, https://doi.org/10.5194/cp-10-1523-2014, https://doi.org/10.5194/cp-10-1523-2014, 2014
M. P. Nardelli, C. Barras, E. Metzger, A. Mouret, H. L. Filipsson, F. Jorissen, and E. Geslin
Biogeosciences, 11, 4029–4038, https://doi.org/10.5194/bg-11-4029-2014, https://doi.org/10.5194/bg-11-4029-2014, 2014
A. Sluijs, L. van Roij, G. J. Harrington, S. Schouten, J. A. Sessa, L. J. LeVay, G.-J. Reichart, and C. P. Slomp
Clim. Past, 10, 1421–1439, https://doi.org/10.5194/cp-10-1421-2014, https://doi.org/10.5194/cp-10-1421-2014, 2014
I. Ruvalcaba Baroni, R. P. M. Topper, N. A. G. M. van Helmond, H. Brinkhuis, and C. P. Slomp
Biogeosciences, 11, 977–993, https://doi.org/10.5194/bg-11-977-2014, https://doi.org/10.5194/bg-11-977-2014, 2014
J. Groeneveld and H. L. Filipsson
Biogeosciences, 10, 5125–5138, https://doi.org/10.5194/bg-10-5125-2013, https://doi.org/10.5194/bg-10-5125-2013, 2013
B. C. Lougheed, H. L. Filipsson, and I. Snowball
Clim. Past, 9, 1015–1028, https://doi.org/10.5194/cp-9-1015-2013, https://doi.org/10.5194/cp-9-1015-2013, 2013
I. Polovodova Asteman, K. Nordberg, and H. L. Filipsson
Biogeosciences, 10, 1275–1290, https://doi.org/10.5194/bg-10-1275-2013, https://doi.org/10.5194/bg-10-1275-2013, 2013
A. F. Bouwman, M. F. P. Bierkens, J. Griffioen, M. M. Hefting, J. J. Middelburg, H. Middelkoop, and C. P. Slomp
Biogeosciences, 10, 1–22, https://doi.org/10.5194/bg-10-1-2013, https://doi.org/10.5194/bg-10-1-2013, 2013
Related subject area
Paleobiogeoscience: Marine Record
Coupled otolith and foraminifera oxygen and carbon stable isotopes evidence paleoceanographic changes and fish metabolic responses
Ideas and perspectives: Human impacts alter the marine fossil record
Origin and role of non-skeletal carbonate in coralligenous build-ups: new geobiological perspectives in biomineralization processes
Serpulid microbialitic bioherms from the upper Sarmatian (Middle Miocene) of the central Paratethys Sea (NW Hungary) – witnesses of a microbial sea
Massive corals record deforestation in Malaysian Borneo through sediments in river discharge
Calcification response of planktic foraminifera to environmental change in the western Mediterranean Sea during the industrial era
Nature and origin of variations in pelagic carbonate production in the tropical ocean since the mid-Miocene (ODP Site 927)
Variation in calcification of Reticulofenestra coccoliths over the Oligocene–Early Miocene
The influence of near-surface sediment hydrothermalism on the TEX86 tetraether-lipid-based proxy and a new correction for ocean bottom lipid overprinting
Testing the effect of bioturbation and species abundance upon discrete-depth individual foraminifera analysis
Test-size evolution of the planktonic foraminifer Globorotalia menardii in the eastern tropical Atlantic since the Late Miocene
Distribution of coccoliths in surface sediments across the Drake Passage and calcification of Emiliania huxleyi morphotypes
Vertical distribution of planktic foraminifera through an oxygen minimum zone: how assemblages and test morphology reflect oxygen concentrations
Reconstructing past variations in environmental conditions and paleoproductivity over the last ∼ 8000 years off north-central Chile (30° S)
A 15-million-year-long record of phenotypic evolution in the heavily calcified coccolithophore Helicosphaera and its biogeochemical implications
Shell chemistry of the boreal Campanian bivalve Rastellum diluvianum (Linnaeus, 1767) reveals temperature seasonality, growth rates and life cycle of an extinct Cretaceous oyster
Southern California margin benthic foraminiferal assemblages record recent centennial-scale changes in oxygen minimum zone
Baseline for ostracod-based northwestern Pacific and Indo-Pacific shallow-marine paleoenvironmental reconstructions: ecological modeling of species distributions
Neogene Caribbean elasmobranchs: diversity, paleoecology and paleoenvironmental significance of the Cocinetas Basin assemblage (Guajira Peninsula, Colombia)
Coastal primary productivity changes over the last millennium: a case study from the Skagerrak (North Sea)
A 1500-year multiproxy record of coastal hypoxia from the northern Baltic Sea indicates unprecedented deoxygenation over the 20th century
Technical note: An empirical method for absolute calibration of coccolith thickness
The oxic degradation of sedimentary organic matter 1400 Ma constrains atmospheric oxygen levels
Geochemical and microstructural characterisation of two species of cool-water bivalves (Fulvia tenuicostata and Soletellina biradiata) from Western Australia
Ecological response to collapse of the biological pump following the mass extinction at the Cretaceous–Paleogene boundary
Quantifying the Cenozoic marine diatom deposition history: links to the C and Si cycles
Anthropogenically induced environmental changes in the northeastern Adriatic Sea in the last 500 years (Panzano Bay, Gulf of Trieste)
Palaeohydrological changes over the last 50 ky in the central Gulf of Cadiz: complex forcing mechanisms mixing multi-scale processes
Dinocyst assemblage constraints on oceanographic and atmospheric processes in the eastern equatorial Atlantic over the last 44 kyr
Sedimentary response to sea ice and atmospheric variability over the instrumental period off Adélie Land, East Antarctica
Equatorward phytoplankton migration during a cold spell within the Late Cretaceous super-greenhouse
Upwellings mitigated Plio-Pleistocene heat stress for reef corals on the Florida platform (USA)
Millennial changes in North Atlantic oxygen concentrations
Vanishing coccolith vital effects with alleviated carbon limitation
Late Pleistocene glacial–interglacial shell-size–isotope variability in planktonic foraminifera as a function of local hydrography
Coral records of reef-water pH across the central Great Barrier Reef, Australia: assessing the influence of river runoff on inshore reefs
Records of past mid-depth ventilation: Cretaceous ocean anoxic event 2 vs. Recent oxygen minimum zones
Organomineral nanocomposite carbon burial during Oceanic Anoxic Event 2
Non-invasive imaging methods applied to neo- and paleo-ontological cephalopod research
Icehouse–greenhouse variations in marine denitrification
Changes in calcification of coccoliths under stable atmospheric CO2
Southern Hemisphere imprint for Indo-Asian summer monsoons during the last glacial period as revealed by Arabian Sea productivity records
The calcareous nannofossil Prinsiosphaera achieved rock-forming abundances in the latest Triassic of western Tethys: consequences for the δ13C of bulk carbonate
The Little Ice Age: evidence from a sediment record in Gullmar Fjord, Swedish west coast
Nitrogen isotopes in bulk marine sediment: linking seafloor observations with subseafloor records
Quantitative reconstruction of sea-surface conditions over the last 150 yr in the Beaufort Sea based on dinoflagellate cyst assemblages: the role of large-scale atmospheric circulation patterns
Spatial linkages between coral proxies of terrestrial runoff across a large embayment in Madagascar
Pteropods from the Caribbean Sea: variations in calcification as an indicator of past ocean carbonate saturation
Sedimentary organic matter and carbonate variations in the Chukchi Borderland in association with ice sheet and ocean-atmosphere dynamics over the last 155 kyr
First discovery of dolomite and magnesite in living coralline algae and its geobiological implications
Konstantina Agiadi, Iuliana Vasiliev, Geanina Butiseacă, George Kontakiotis, Danae Thivaiou, Evangelia Besiou, Stergios Zarkogiannis, Efterpi Koskeridou, Assimina Antonarakou, and Andreas Mulch
Biogeosciences, 21, 3869–3881, https://doi.org/10.5194/bg-21-3869-2024, https://doi.org/10.5194/bg-21-3869-2024, 2024
Short summary
Short summary
Seven million years ago, the marine gateway connecting the Mediterranean Sea with the Atlantic Ocean started to close, and, as a result, water circulation ceased. To find out how this phenomenon affected the fish living in the Mediterranean Sea, we examined the changes in the isotopic composition of otoliths of two common fish species. Although the species living at the surface fared pretty well, the bottom-water fish starved and eventually became extinct in the Mediterranean.
Rafał Nawrot, Martin Zuschin, Adam Tomašových, Michał Kowalewski, and Daniele Scarponi
Biogeosciences, 21, 2177–2188, https://doi.org/10.5194/bg-21-2177-2024, https://doi.org/10.5194/bg-21-2177-2024, 2024
Short summary
Short summary
The youngest fossil record is a crucial source of data on the history of marine ecosystems and their long-term alteration by humans. However, human activities that reshape ecosystems also alter sedimentary and biological processes that control the formation of the geological archives recording those impacts. Thus, humans have been transforming the marine fossil record in ways that affect our ability to reconstruct past ecological and climate dynamics.
Mara Cipriani, Carmine Apollaro, Daniela Basso, Pietro Bazzicalupo, Marco Bertolino, Valentina Alice Bracchi, Fabio Bruno, Gabriele Costa, Rocco Dominici, Alessandro Gallo, Maurizio Muzzupappa, Antonietta Rosso, Rossana Sanfilippo, Francesco Sciuto, Giovanni Vespasiano, and Adriano Guido
Biogeosciences, 21, 49–72, https://doi.org/10.5194/bg-21-49-2024, https://doi.org/10.5194/bg-21-49-2024, 2024
Short summary
Short summary
Who constructs the build-ups of the Mediterranean Sea? What is the role of skeletal and soft-bodied organisms in these bioconstructions? Do bacteria play a role in their formation? In this research, for the first time, the coralligenous of the Mediterranean shelf is studied from a geobiological point of view with an interdisciplinary biological and geological approach, highlighting important biotic relationships that can be used in interpreting the fossil build-up systems.
Mathias Harzhauser, Oleg Mandic, and Werner E. Piller
Biogeosciences, 20, 4775–4794, https://doi.org/10.5194/bg-20-4775-2023, https://doi.org/10.5194/bg-20-4775-2023, 2023
Short summary
Short summary
Bowl-shaped spirorbid microbialite bioherms formed during the late Middle Miocene (Sarmatian) in the central Paratethys Sea under a warm, arid climate. The microbialites and the surrounding sediment document a predominance of microbial activity in the shallow marine environments of the sea at that time. Modern microbialites are not analogues for these unique structures, which reflect a series of growth stages with an initial “start-up stage”, massive “keep-up stage” and termination of growth.
Walid Naciri, Arnoud Boom, Matthew Payne, Nicola Browne, Noreen J. Evans, Philip Holdship, Kai Rankenburg, Ramasamy Nagarajan, Bradley J. McDonald, Jennifer McIlwain, and Jens Zinke
Biogeosciences, 20, 1587–1604, https://doi.org/10.5194/bg-20-1587-2023, https://doi.org/10.5194/bg-20-1587-2023, 2023
Short summary
Short summary
In this study, we tested the ability of massive boulder-like corals to act as archives of land use in Malaysian Borneo to palliate the lack of accurate instrumental data on deforestation before the 1980s. We used mass spectrometry to measure trace element ratios in coral cores to use as a proxy for sediment in river discharge. Results showed an extremely similar increase between our proxy and the river discharge instrumental record, demonstrating the use of these corals as reliable archives.
Thibauld M. Béjard, Andrés S. Rigual-Hernández, José A. Flores, Javier P. Tarruella, Xavier Durrieu de Madron, Isabel Cacho, Neghar Haghipour, Aidan Hunter, and Francisco J. Sierro
Biogeosciences, 20, 1505–1528, https://doi.org/10.5194/bg-20-1505-2023, https://doi.org/10.5194/bg-20-1505-2023, 2023
Short summary
Short summary
The Mediterranean Sea is undergoing a rapid and unprecedented environmental change. Planktic foraminifera calcification is affected on different timescales. On seasonal and interannual scales, calcification trends differ according to the species and are linked mainly to sea surface temperatures and carbonate system parameters, while comparison with pre/post-industrial assemblages shows that all three species have reduced their calcification between 10 % to 35 % according to the species.
Pauline Cornuault, Thomas Westerhold, Heiko Pälike, Torsten Bickert, Karl-Heinz Baumann, and Michal Kucera
Biogeosciences, 20, 597–618, https://doi.org/10.5194/bg-20-597-2023, https://doi.org/10.5194/bg-20-597-2023, 2023
Short summary
Short summary
We generated high-resolution records of carbonate accumulation rate from the Miocene to the Quaternary in the tropical Atlantic Ocean to characterize the variability in pelagic carbonate production during warm climates. It follows orbital cycles, responding to local changes in tropical conditions, as well as to long-term shifts in climate and ocean chemistry. These changes were sufficiently large to play a role in the carbon cycle and global climate evolution.
José Guitián, Miguel Ángel Fuertes, José-Abel Flores, Iván Hernández-Almeida, and Heather Stoll
Biogeosciences, 19, 5007–5019, https://doi.org/10.5194/bg-19-5007-2022, https://doi.org/10.5194/bg-19-5007-2022, 2022
Short summary
Short summary
The effect of environmental conditions on the degree of calcification of marine phytoplankton remains unclear. This study implements a new microscopic approach to quantify the calcification of ancient coccolithophores, using North Atlantic sediments. Results show significant differences in the thickness and shape factor of coccoliths for samples with minimum dissolution, providing the first evaluation of phytoplankton physiology adaptation to million-year-scale variable environmental conditions.
Jeremy N. Bentley, Gregory T. Ventura, Clifford C. Walters, Stefan M. Sievert, and Jeffrey S. Seewald
Biogeosciences, 19, 4459–4477, https://doi.org/10.5194/bg-19-4459-2022, https://doi.org/10.5194/bg-19-4459-2022, 2022
Short summary
Short summary
We demonstrate the TEX86 (TetraEther indeX of 86 carbon atoms) paleoclimate proxy can become heavily impacted by the ocean floor archaeal community. The impact results from source inputs, their diagenetic and catagenetic alteration, and further overprint by the additions of lipids from the ocean floor sedimentary archaeal community. We then present a method to correct the overprints by using IPLs (intact polar lipids) extracted from both water column and subsurface archaeal communities.
Bryan C. Lougheed and Brett Metcalfe
Biogeosciences, 19, 1195–1209, https://doi.org/10.5194/bg-19-1195-2022, https://doi.org/10.5194/bg-19-1195-2022, 2022
Short summary
Short summary
Measurements on sea-dwelling shelled organisms called foraminifera retrieved from deep-sea sediment cores have been used to reconstruct sea surface temperature (SST) variation. To evaluate the method, we use a computer model to simulate millions of single foraminifera and how they become mixed in the sediment after being deposited on the seafloor. We compare the SST inferred from the single foraminifera in the sediment core to the true SST in the water, thus quantifying method uncertainties.
Thore Friesenhagen
Biogeosciences, 19, 777–805, https://doi.org/10.5194/bg-19-777-2022, https://doi.org/10.5194/bg-19-777-2022, 2022
Short summary
Short summary
Size measurements of the planktonic foraminifer Globorotalia menardii and related forms are used to investigate the shell-size evolution for the last 8 million years in the eastern tropical Atlantic Ocean. Long-term changes in the shell size coincide with major climatic, palaeogeographic and palaeoceanographic changes and suggest the occurrence of a new G. menardii type in the Atlantic Ocean ca. 2 million years ago.
Nele Manon Vollmar, Karl-Heinz Baumann, Mariem Saavedra-Pellitero, and Iván Hernández-Almeida
Biogeosciences, 19, 585–612, https://doi.org/10.5194/bg-19-585-2022, https://doi.org/10.5194/bg-19-585-2022, 2022
Short summary
Short summary
We studied recent (sub-)fossil remains of a type of algae (coccolithophores) off southernmost Chile and across the Drake Passage, adding to the scarce knowledge that exists in the Southern Ocean, a rapidly changing environment. We found that those can be used to reconstruct the surface ocean conditions in the north but not in the south. We also found variations in shape in the dominant species Emiliania huxleyi depending on the location, indicating subtle adaptations to environmental conditions.
Catherine V. Davis, Karen Wishner, Willem Renema, and Pincelli M. Hull
Biogeosciences, 18, 977–992, https://doi.org/10.5194/bg-18-977-2021, https://doi.org/10.5194/bg-18-977-2021, 2021
Práxedes Muñoz, Lorena Rebolledo, Laurent Dezileau, Antonio Maldonado, Christoph Mayr, Paola Cárdenas, Carina B. Lange, Katherine Lalangui, Gloria Sanchez, Marco Salamanca, Karen Araya, Ignacio Jara, Gabriel Easton, and Marcel Ramos
Biogeosciences, 17, 5763–5785, https://doi.org/10.5194/bg-17-5763-2020, https://doi.org/10.5194/bg-17-5763-2020, 2020
Short summary
Short summary
We analyze marine sedimentary records to study temporal changes in oxygen and productivity in marine waters of central Chile. We observed increasing oxygenation and decreasing productivity from 6000 kyr ago to the modern era that seem to respond to El Niño–Southern Oscillation activity. In the past centuries, deoxygenation and higher productivity are re-established, mainly in the northern zones of Chile and Peru. Meanwhile, in north-central Chile the deoxygenation trend is maintained.
Luka Šupraha and Jorijntje Henderiks
Biogeosciences, 17, 2955–2969, https://doi.org/10.5194/bg-17-2955-2020, https://doi.org/10.5194/bg-17-2955-2020, 2020
Short summary
Short summary
The cell size, degree of calcification and growth rates of coccolithophores impact their role in the carbon cycle and may also influence their adaptation to environmental change. Combining insights from culture experiments and the fossil record, we show that the selection for smaller cells over the past 15 Myr has been a common adaptive trait among different lineages. However, heavily calcified species maintained a more stable biogeochemical output than the ancestral lineage of E. huxleyi.
Niels J. de Winter, Clemens V. Ullmann, Anne M. Sørensen, Nicolas Thibault, Steven Goderis, Stijn J. M. Van Malderen, Christophe Snoeck, Stijn Goolaerts, Frank Vanhaecke, and Philippe Claeys
Biogeosciences, 17, 2897–2922, https://doi.org/10.5194/bg-17-2897-2020, https://doi.org/10.5194/bg-17-2897-2020, 2020
Short summary
Short summary
In this study, we present a detailed investigation of the chemical composition of 12 specimens of very well preserved, 78-million-year-old oyster shells from southern Sweden. The chemical data show how the oysters grew, the environment in which they lived and how old they became and also provide valuable information about which chemical measurements we can use to learn more about ancient climate and environment from such shells. In turn, this can help improve climate reconstructions and models.
Hannah M. Palmer, Tessa M. Hill, Peter D. Roopnarine, Sarah E. Myhre, Katherine R. Reyes, and Jonas T. Donnenfield
Biogeosciences, 17, 2923–2937, https://doi.org/10.5194/bg-17-2923-2020, https://doi.org/10.5194/bg-17-2923-2020, 2020
Short summary
Short summary
Modern climate change is causing expansions of low-oxygen zones, with detrimental impacts to marine life. To better predict future ocean oxygen change, we study past expansions and contractions of low-oxygen zones using microfossils of seafloor organisms. We find that, along the San Diego margin, the low-oxygen zone expanded into more shallow water in the last 400 years, but the conditions within and below the low-oxygen zone did not change significantly in the last 1500 years.
Yuanyuan Hong, Moriaki Yasuhara, Hokuto Iwatani, and Briony Mamo
Biogeosciences, 16, 585–604, https://doi.org/10.5194/bg-16-585-2019, https://doi.org/10.5194/bg-16-585-2019, 2019
Short summary
Short summary
This study analyzed microfaunal assemblages in surface sediments from 52 sites in Hong Kong marine waters. We selected 18 species for linear regression modeling to statistically reveal the relationship between species distribution and environmental factors. These results show environmental preferences of commonly distributed species on Asian coasts, providing a robust baseline for past environmental reconstruction of the broad Asian region using microfossils in sediment cores.
Jorge Domingo Carrillo-Briceño, Zoneibe Luz, Austin Hendy, László Kocsis, Orangel Aguilera, and Torsten Vennemann
Biogeosciences, 16, 33–56, https://doi.org/10.5194/bg-16-33-2019, https://doi.org/10.5194/bg-16-33-2019, 2019
Short summary
Short summary
By combining taxonomy and geochemistry, we corroborated the described paleoenvironments from a Neogene fossiliferous deposit of South America. Shark teeth specimens were used for taxonomic identification and as proxies for geochemical analyses. With a multidisciplinary approach we refined the understanding about the paleoenvironmental setting and the paleoecological characteristics of the studied groups, in our case, for the bull shark and its incursions into brackish waters.
Anna Binczewska, Bjørg Risebrobakken, Irina Polovodova Asteman, Matthias Moros, Amandine Tisserand, Eystein Jansen, and Andrzej Witkowski
Biogeosciences, 15, 5909–5928, https://doi.org/10.5194/bg-15-5909-2018, https://doi.org/10.5194/bg-15-5909-2018, 2018
Short summary
Short summary
Primary productivity is an important factor in the functioning and structuring of the coastal ecosystem. Thus, two sediment cores from the Skagerrak (North Sea) were investigated in order to obtain a comprehensive picture of primary productivity changes during the last millennium and identify associated forcing factors (e.g. anthropogenic, climate). The cores were dated and analysed for palaeoproductivity proxies and palaeothermometers.
Sami A. Jokinen, Joonas J. Virtasalo, Tom Jilbert, Jérôme Kaiser, Olaf Dellwig, Helge W. Arz, Jari Hänninen, Laura Arppe, Miia Collander, and Timo Saarinen
Biogeosciences, 15, 3975–4001, https://doi.org/10.5194/bg-15-3975-2018, https://doi.org/10.5194/bg-15-3975-2018, 2018
Short summary
Short summary
Oxygen deficiency is a major environmental problem deteriorating seafloor habitats especially in the coastal ocean with large human impact. Here we apply a wide set of chemical and physical analyses to a 1500-year long sediment record and show that, although long-term climate variability has modulated seafloor oxygenation in the coastal northern Baltic Sea, the oxygen loss over the 20th century is unprecedentedly severe, emphasizing the need to reduce anthropogenic nutrient input in the future.
Saúl González-Lemos, José Guitián, Miguel-Ángel Fuertes, José-Abel Flores, and Heather M. Stoll
Biogeosciences, 15, 1079–1091, https://doi.org/10.5194/bg-15-1079-2018, https://doi.org/10.5194/bg-15-1079-2018, 2018
Short summary
Short summary
Changes in atmospheric carbon dioxide affect ocean chemistry and the ability of marine organisms to manufacture shells from calcium carbonate. We describe a technique to obtain more reproducible measurements of the thickness of calcium carbonate shells made by microscopic marine algae called coccolithophores, which will allow researchers to compare how the shell thickness responds to variations in ocean chemistry in the past and present.
Shuichang Zhang, Xiaomei Wang, Huajian Wang, Emma U. Hammarlund, Jin Su, Yu Wang, and Donald E. Canfield
Biogeosciences, 14, 2133–2149, https://doi.org/10.5194/bg-14-2133-2017, https://doi.org/10.5194/bg-14-2133-2017, 2017
Liza M. Roger, Annette D. George, Jeremy Shaw, Robert D. Hart, Malcolm Roberts, Thomas Becker, Bradley J. McDonald, and Noreen J. Evans
Biogeosciences, 14, 1721–1737, https://doi.org/10.5194/bg-14-1721-2017, https://doi.org/10.5194/bg-14-1721-2017, 2017
Short summary
Short summary
The shell compositions of bivalve species from south Western Australia are described here to better understand the factors involved in their formation. The shell composition can be used to reconstruct past environmental conditions, but certain species manifest an offset compared to the environmental parameters measured. As shown here, shells that experience the same conditions can present different compositions in relation to structure, organic composition and environmental conditions.
Johan Vellekoop, Lineke Woelders, Sanem Açikalin, Jan Smit, Bas van de Schootbrugge, Ismail Ö. Yilmaz, Henk Brinkhuis, and Robert P. Speijer
Biogeosciences, 14, 885–900, https://doi.org/10.5194/bg-14-885-2017, https://doi.org/10.5194/bg-14-885-2017, 2017
Short summary
Short summary
The Cretaceous–Paleogene boundary, ~ 66 Ma, is characterized by a mass extinction. We studied groups of both surface-dwelling and bottom-dwelling organisms to unravel the oceanographic consequences of these extinctions. Our integrated records indicate that a reduction of the transport of organic matter to the sea floor resulted in enhanced recycling of nutrients in the upper water column and decreased food supply at the sea floor in the first tens of thousands of years after the extinctions.
Johan Renaudie
Biogeosciences, 13, 6003–6014, https://doi.org/10.5194/bg-13-6003-2016, https://doi.org/10.5194/bg-13-6003-2016, 2016
Short summary
Short summary
Marine planktonic diatoms are today both the main silica and carbon exporter to the deep sea. However, 50 million years ago, radiolarians were the main silica exporter and diatoms were a rare, geographically restricted group. Quantification of their rise to dominance suggest that diatom abundance is primarily controlled by the continental weathering and has a negative feedback, observable on a geological timescale, on the carbon cycle.
Jelena Vidović, Rafał Nawrot, Ivo Gallmetzer, Alexandra Haselmair, Adam Tomašových, Michael Stachowitsch, Vlasta Ćosović, and Martin Zuschin
Biogeosciences, 13, 5965–5981, https://doi.org/10.5194/bg-13-5965-2016, https://doi.org/10.5194/bg-13-5965-2016, 2016
Short summary
Short summary
We studied the ecological history of the Gulf of Trieste. Before the 20th century, the only activity here was ore mining, releasing high amounts of mercury into its northern part, Panzano Bay. Mercury did not cause changes to microorganisms, as it is not bioavailable. In the 20th century, agriculture caused nutrient enrichment in the bay and increased diversity of microorganisms. Industrial activities increased the concentrations of pollutants, causing only minor changes to microorganisms.
Aurélie Penaud, Frédérique Eynaud, Antje Helga Luise Voelker, and Jean-Louis Turon
Biogeosciences, 13, 5357–5377, https://doi.org/10.5194/bg-13-5357-2016, https://doi.org/10.5194/bg-13-5357-2016, 2016
Short summary
Short summary
This paper presents new analyses conducted at high resolution in the Gulf of Cadiz over the last 50 ky. Palaeohydrological changes in these subtropical latitudes are discussed through dinoflagellate cyst assemblages but also dinocyst transfer function results, implying sea surface temperature and salinity as well as annual productivity reconstructions. This study is thus important for our understanding of past and future productivity regimes, also implying consequences on the biological pump.
William Hardy, Aurélie Penaud, Fabienne Marret, Germain Bayon, Tania Marsset, and Laurence Droz
Biogeosciences, 13, 4823–4841, https://doi.org/10.5194/bg-13-4823-2016, https://doi.org/10.5194/bg-13-4823-2016, 2016
Short summary
Short summary
Our approach is based on a multi-proxy study from a core collected off the Congo River and discusses surface oceanic conditions (upwelling cells, river-induced upwelling), land–sea interactions and terrestrial erosion and in particular enables us to spatially constrain the migration of atmospheric systems. This paper thus presents new data highlighting, with the highest resolution ever reached in this region, the great correlation between phytoplanktonic organisms and monsoonal mechanisms.
Philippine Campagne, Xavier Crosta, Sabine Schmidt, Marie Noëlle Houssais, Olivier Ther, and Guillaume Massé
Biogeosciences, 13, 4205–4218, https://doi.org/10.5194/bg-13-4205-2016, https://doi.org/10.5194/bg-13-4205-2016, 2016
Short summary
Short summary
Diatoms and biomarkers have been recently used for palaeoclimate reconstructions in the Southern Ocean. Few sediment-based ecological studies have investigated their relationships with environmental conditions. Here, we compare high-resolution sedimentary records with meteorological data to study relationships between our proxies and recent atmospheric and sea surface changes. Our results indicate that coupled wind pattern and sea surface variability act as the proximal forcing at that scale.
Niels A. G. M. van Helmond, Appy Sluijs, Nina M. Papadomanolaki, A. Guy Plint, Darren R. Gröcke, Martin A. Pearce, James S. Eldrett, João Trabucho-Alexandre, Ireneusz Walaszczyk, Bas van de Schootbrugge, and Henk Brinkhuis
Biogeosciences, 13, 2859–2872, https://doi.org/10.5194/bg-13-2859-2016, https://doi.org/10.5194/bg-13-2859-2016, 2016
Short summary
Short summary
Over the past decades large changes have been observed in the biogeographical dispersion of marine life resulting from climate change. To better understand present and future trends it is important to document and fully understand the biogeographical response of marine life during episodes of environmental change in the geological past.
Here we investigate the response of phytoplankton, the base of the marine food web, to a rapid cold spell, interrupting greenhouse conditions during the Cretaceous.
Thomas C. Brachert, Markus Reuter, Stefan Krüger, Julia Kirkerowicz, and James S. Klaus
Biogeosciences, 13, 1469–1489, https://doi.org/10.5194/bg-13-1469-2016, https://doi.org/10.5194/bg-13-1469-2016, 2016
Short summary
Short summary
We present stable isotope proxy data and calcification records from fossil reef corals. The corals investigated derive from the Florida carbonate platform and are of middle Pliocene to early Pleistocene age. From the data we infer an environment subject to intermittent upwelling on annual to decadal timescales. Calcification rates were enhanced during periods of upwelling. This is likely an effect of dampened SSTs during the upwelling.
B. A. A. Hoogakker, D. J. R. Thornalley, and S. Barker
Biogeosciences, 13, 211–221, https://doi.org/10.5194/bg-13-211-2016, https://doi.org/10.5194/bg-13-211-2016, 2016
Short summary
Short summary
Models predict a decrease in future ocean O2, driven by surface water warming and freshening in the polar regions, causing a reduction in ocean circulation. Here we assess this effect in the past, focussing on the response of deep and intermediate waters from the North Atlantic during large-scale ice rafting and millennial-scale cooling events of the last glacial.
Our assessment agrees with the models but also highlights the importance of biological processes driving ocean O2 change.
M. Hermoso, I. Z. X. Chan, H. L. O. McClelland, A. M. C. Heureux, and R. E. M. Rickaby
Biogeosciences, 13, 301–312, https://doi.org/10.5194/bg-13-301-2016, https://doi.org/10.5194/bg-13-301-2016, 2016
B. Metcalfe, W. Feldmeijer, M. de Vringer-Picon, G.-J. A. Brummer, F. J. C. Peeters, and G. M. Ganssen
Biogeosciences, 12, 4781–4807, https://doi.org/10.5194/bg-12-4781-2015, https://doi.org/10.5194/bg-12-4781-2015, 2015
Short summary
Short summary
Iron biogeochemical budgets during the natural ocean fertilisation experiment KEOPS-2 showed that complex circulation and transport pathways were responsible for differences in the mode and strength of iron supply, with vertical supply dominant on the plateau and lateral supply dominant in the plume. The exchange of iron between dissolved, biogenic and lithogenic pools was highly dynamic, resulting in a decoupling of iron supply and carbon export and controlling the efficiency of fertilisation.
J. P. D'Olivo, M. T. McCulloch, S. M. Eggins, and J. Trotter
Biogeosciences, 12, 1223–1236, https://doi.org/10.5194/bg-12-1223-2015, https://doi.org/10.5194/bg-12-1223-2015, 2015
Short summary
Short summary
The boron isotope composition in the skeleton of massive Porites corals from the central Great Barrier Reef is used to reconstruct the seawater pH over the 1940-2009 period. The long-term decline in the coral-reconstructed seawater pH is in close agreement with estimates based on the CO2 uptake by surface waters due to rising atmospheric levels. We also observed a significant relationship between terrestrial runoff data and the inshore coral boron isotopes records.
J. Schönfeld, W. Kuhnt, Z. Erdem, S. Flögel, N. Glock, M. Aquit, M. Frank, and A. Holbourn
Biogeosciences, 12, 1169–1189, https://doi.org/10.5194/bg-12-1169-2015, https://doi.org/10.5194/bg-12-1169-2015, 2015
Short summary
Short summary
Today’s oceans show distinct mid-depth oxygen minima while whole oceanic basins became transiently anoxic in the Mesozoic. To constrain past bottom-water oxygenation, we compared sediments from the Peruvian OMZ with the Cenomanian OAE 2 from Morocco. Corg accumulation rates in laminated OAE 2 sections match Holocene rates off Peru. Laminated deposits are found at oxygen levels of < 7µmol kg-1; crab burrows appear at 10µmol kg-1 today, both defining threshold values for palaeoreconstructions.
S. C. Löhr and M. J. Kennedy
Biogeosciences, 11, 4971–4983, https://doi.org/10.5194/bg-11-4971-2014, https://doi.org/10.5194/bg-11-4971-2014, 2014
R. Hoffmann, J. A. Schultz, R. Schellhorn, E. Rybacki, H. Keupp, S. R. Gerden, R. Lemanis, and S. Zachow
Biogeosciences, 11, 2721–2739, https://doi.org/10.5194/bg-11-2721-2014, https://doi.org/10.5194/bg-11-2721-2014, 2014
T. J. Algeo, P. A. Meyers, R. S. Robinson, H. Rowe, and G. Q. Jiang
Biogeosciences, 11, 1273–1295, https://doi.org/10.5194/bg-11-1273-2014, https://doi.org/10.5194/bg-11-1273-2014, 2014
C. Berger, K. J. S. Meier, H. Kinkel, and K.-H. Baumann
Biogeosciences, 11, 929–944, https://doi.org/10.5194/bg-11-929-2014, https://doi.org/10.5194/bg-11-929-2014, 2014
T. Caley, S. Zaragosi, J. Bourget, P. Martinez, B. Malaizé, F. Eynaud, L. Rossignol, T. Garlan, and N. Ellouz-Zimmermann
Biogeosciences, 10, 7347–7359, https://doi.org/10.5194/bg-10-7347-2013, https://doi.org/10.5194/bg-10-7347-2013, 2013
N. Preto, C. Agnini, M. Rigo, M. Sprovieri, and H. Westphal
Biogeosciences, 10, 6053–6068, https://doi.org/10.5194/bg-10-6053-2013, https://doi.org/10.5194/bg-10-6053-2013, 2013
I. Polovodova Asteman, K. Nordberg, and H. L. Filipsson
Biogeosciences, 10, 1275–1290, https://doi.org/10.5194/bg-10-1275-2013, https://doi.org/10.5194/bg-10-1275-2013, 2013
J.-E. Tesdal, E. D. Galbraith, and M. Kienast
Biogeosciences, 10, 101–118, https://doi.org/10.5194/bg-10-101-2013, https://doi.org/10.5194/bg-10-101-2013, 2013
L. Durantou, A. Rochon, D. Ledu, G. Massé, S. Schmidt, and M. Babin
Biogeosciences, 9, 5391–5406, https://doi.org/10.5194/bg-9-5391-2012, https://doi.org/10.5194/bg-9-5391-2012, 2012
C. A. Grove, J. Zinke, T. Scheufen, J. Maina, E. Epping, W. Boer, B. Randriamanantsoa, and G.-J. A. Brummer
Biogeosciences, 9, 3063–3081, https://doi.org/10.5194/bg-9-3063-2012, https://doi.org/10.5194/bg-9-3063-2012, 2012
D. Wall-Palmer, M. B. Hart, C. W. Smart, R. S. J. Sparks, A. Le Friant, G. Boudon, C. Deplus, and J. C. Komorowski
Biogeosciences, 9, 309–315, https://doi.org/10.5194/bg-9-309-2012, https://doi.org/10.5194/bg-9-309-2012, 2012
S. F. Rella and M. Uchida
Biogeosciences, 8, 3545–3553, https://doi.org/10.5194/bg-8-3545-2011, https://doi.org/10.5194/bg-8-3545-2011, 2011
M. C. Nash, U. Troitzsch, B. N. Opdyke, J. M. Trafford, B. D. Russell, and D. I. Kline
Biogeosciences, 8, 3331–3340, https://doi.org/10.5194/bg-8-3331-2011, https://doi.org/10.5194/bg-8-3331-2011, 2011
Cited articles
Andrén, E., Andrén, T., and Kunzendorf, H.: Holocene history of the Baltic Sea as a background for assessing records of human impact in the sediments of the Gotland Basin, The Holocene, 10, 687–702, https://doi.org/10.1191/09596830094944, 2000.
Andrén, T., Björck, S., Andrén, E., Conley, D., Zillén, L., and Anjar, J.: The development of the Baltic Sea basin during the last 130 ka, in: The Baltic Sea Basin, edited by: Harff, J., Björck, S., and Hoth, P., Springer, Berlin, 75–97, 2011.
Andrén, T., Jørgensen, B. B., Cotterill, C., and the Expedition 347 Scientists: Baltic Sea Paleoenvironment, Proceedings IODP, 347, College Station, TX, Integrated Ocean Drilling Program, https://doi.org/10.2204/iodp.proc.347.101.2015, 2015a.
Andrén, T., Jørgensen, B. B., Cotteril, C., Green, S., and the IODP expedition 347 scientific party: Baltic Sea basin paleoenvironment and biosphere, Scientific Drilling, 20, 1–12, https://doi.org/10.5194/sd-20-1-2015, 2015b.
Anjar, J., Adrielsson, L., Bennike, O., Björck, S., Filipsson, H. L., Groeneveld, J., Knudsen, K. L., Larsen, N. K., and Möller, P.: Palaeoenvironmental history of the Baltic Sea basin during Marine Isotope Stage 3, Quaternary Sci. Rev., 34, 81–92, https://doi.org/10.1016/j.quascirev.2011.12.009, 2012.
Austin, W. E. N., Cage, A. G., and Scourse, J. D.: Mid-latitude shelf seas: a NW European perspective on the seasonal dynamics of temperature, salinity, and oxygen isotopes, The Holocene, 16, 937–947, https://doi.org/10.1177/0959683606hl985rp, 2006.
Barker, S., Greaves, M., and Elderfield, H.,: A study of cleaning procedures used for foraminiferal Mg ∕ Ca paleothermometry, Geochem. Geophy. Geosy., 4, 8407, https://doi.org/10.1029/2003GC000559, 2003.
Bendixen, C., Jensen, J. B., Boldreel, L. O., Clausen, O. R., Bennike, O., Seidenkrantz, M.-S., Nyberg, J., and Hübscher, C.: The Holocene Great Belt connection to the southern Kattegat, Scandinavia: Ancylus Lake drainage and Early Littorina Sea transgression, Boreas, 46, 53–68, https://doi.org/10.1111/bor.12154, 2016.
Bennike, O. and Jensen, J. B.: Postglacial, relative shore-level changes in Lillebælt, Denmark, Geol. Surv. Den. Greenl., 23, 37–40, 2011.
Berg, C., Vandieken, V., Thamdrup, B., and Jürgens, K.: Significance of archaeal nitrification in hypoxic waters oft he Baltic Sea, ISME J., 9, 1319–1332, 2015.
Björck, S.: The late quaternary development of the Baltic Sea Basin, in: Assessment of Climate Change for the Baltic Sea Basin, edited by: The BACC Author Team, Springer-Verlag, Berlin-Heidelberg, 398–407, 2008.
Blaauw, M.: Methods and code for “classical” age-modelling of radiocarbon sequences, Quat. Geochronol., 5, 5512–5518, https://doi.org/10.1016/j.quageo.2010.01.002, 2010.
Bordon, A., Peyron, O., Lézine, A.-M., Brewer, S., and Fouache, E.: Pollen-inferred Late-Glacial and Holocene climate in southern Balkans (Lake Maliq), Quatern. Int., 200, 19–30, https://doi.org/10.1016/j.quaint.2008.05.014, 2009.
Brenner, W. W.: Holocene environmental history of the Gotland Basin (Baltic Sea) – a micropalaeontological model, Palaeogeogr. Palaeocl., 220, 227–241, https://doi.org/10.1016/j.palaeo.2004.12.010, 2005.
Butruille, C., Krossa, V. R., Schwab, C., and Weinelt, M.: Reconstruction of mid- to late-Holocene winter temperatures in the Skagerrak region using benthic foraminiferal Mg ∕ Ca and δ18O, The Holocene, 1, 63–72, https://doi.org/10.1177/0959683616652701, 2017.
Conley, D. J., Carstensen, J., Aigars, J., Axe, P., Bonsdorff, E., Eremina, T., Haahti, B.-M., Humborg, C., Jonsson, P., Kotta, J., Lännegren, C., Larsson, U., Maximov, A., Medina, M.R., Lysiak-Pastuszak, E., Remeikaite-Nikiene, N., Walve, J., Wilhelms, S., and Zillén, L.: Hypoxia is increasing in the coastal zone of the Baltic Sea, Environ. Sci. Technol., 45, 6777–6783, https://doi.org/10.1021/es201212r, 2011.
Danish Meteorological Institute, http://www.dmi.dk/vejr/arkiver/normaler-og-ekstremer/klimanormaler-dk/vejrnormal/ last access: 24 February 2017.
Darling, K. D., Schweizer, M., Knudsen, K. L., Evans, K. M., Bird, C., Roberts, A., Filipsson, H. L., Kim, J.-H., Gudmundsson, G., Wade, C. M., Sayer, M. D. J., and Austin, W. E. N.: The genetic diversity, phylogeography and morphology of Elphidiidae (Foraminifera) in the Northeast Atlantic, Mar. Micropalaeontol., 129, 1–23, https://doi.org/10.1016/j.marmicro.2016.09.001, 2016.
Davis, B. A. S., Brewer, S., Stevenson, A. C., et al.: The temperature of Europe during the Holocene reconstructed from pollen data, Quaternary Sci. Rev., 22, 1701–1716, https://doi.org/10.1016/S0277-3791(03)00173-2, 2003.
de Bar, M. W., Dorhout, D. J. C., Hopmans, E. C., Rampen, S. W., Sinninghe Damsté, J. S., and Schouten, S.: Constraints on the application of long chain diol proxies in the Iberian Atlantic margin, Org. Geochem., 101, 184–195, https://doi.org/10.1016/j.orggeochem.2016.09.005, 2016.
Dennis, K. J., Affek, H. P., Passey, B. H., Schrag, D. P., and Eiler, J. M.: Defining an absolute reference frame for "clumped" isotope studies of CO2, Geochim. Cosmochim. Ac., 75, 7117-7131, https://doi.org/10.1016/j.gca.2011.09.025, 2011.
de Vernal, A. and Marret, F.: Organic-walled dinoflagellate cysts: tracers of sea-surface conditions, in: Proxies in Late Cenozoic Paleoceanography, edited by: Hillaire-Marcel, C. and de Vernal, A., Elsevier, 371–408, https://doi.org/10.1016/S1572-5480(07)01014-7, 2007.
Dörfler, W., Feeser, I., van den Bogaard, C., Dreibrodt, S., Erlenkeuser, H., Kleinmann, A., Merkt, J., and Wiethold, J.: A high-quality annually laminated sequence from Lake Belau, Northern Germany: Revised chronology and its implication for palynological and tephrochronological studies, The Holocene, 22, 1413–1426, https://doi.org/10.1177/0959683612449756, 2012.
Dormoy, I., Peyron, O., Combourieu Nebout, N., Goring, S., Kotthoff, U., Magny, M., and Pross, J.: Terrestrial climate variability and seasonality changes in the Mediterranean region between 15 000 and 4000 years BP deduced from marine pollen records, Clim. Past, 5, 615–632, https://doi.org/10.5194/cp-5-615-2009, 2009.
Eiler, J. M.: Paleoclimate reconstruction using carbonate clumped isotope thermometry, Quaternary Sci. Rev., 30, 3575–3588, https://doi.org/10.1016/j.quascirev.2011.09.001, 2011.
Ezat, M. M., Rasmussen, T. L., and Groeneveld, J.: Reconstruction of hydrographic changes in the southern Norwegian Sea during the past 135 kyr and the impact of different foraminiferal Mg ∕ Ca cleaning protocols, Geochem. Geophy. Geosy., 17, 3420–3436, https://doi.org/10.1002/2016GC006325, 2016.
Filipsson, H. L., Nordberg, K., and Gustafsson, M.: Seasonal study of δ18O and δ13C in living (stained) benthic foraminifera from two Swedish fjords, Mar. Micropaleontol., 53, 159–172, https://doi.org/10.1016/j.marmicro.2004.05.008, 2004.
Filipsson, H. L., McCorkle, D. C., Mackensen, A., Bernhard, J. M., Andersson, L. S., Naustvoll, L.-J., Caballero-Alfonso, A. M., Nordberg, K., and Danielssen, D.S.: Seasonal variability of stable carbon isotopes (δ13CDIC) in the Skagerrak and the Baltic Sea: Distinguishing between mixing and biological productivity, Palaeogeogr. Palaeocl., 483, 15–30, https://doi.org/10.1016/j.palaeo.2016.11.031, 2016.
Frenzel, P. and Boomer, I.: The use of ostracods from marginal marine, brackish waters as bioindicators of modern and Quaternary environmental change, Palaeogeogr. Palaeocl., 225, 68–92, https://doi.org/10.1016/j.palaeo.2004.02.051, 2005.
Frenzel, P., Keyser, D., and Viehberg, F. A.: An illustrated key and (palaeo)ecological primer for postglacial to Recent Ostracoda (Crustacea) of the Baltic Sea, Boreas, 39, 567–575, https://doi.org/10.1111/j.1502-3885.2009.00135.x, 2010.
Greaves, M., Caillon, N., Rebaubier, H., et al.: Interlaboratory comparison study of calibration standards for foraminiferal Mg ∕ Ca thermometry, Geochem. Geophy. Geosy., 9, Q08010, https://doi.org/10.1029/2008GC001974, 2008.
Groeneveld, J. and Filipsson, H. L.: Mg ∕ Ca and Mn ∕ Ca ratios in benthic foraminifera: the potential to reconstruct past variations in temperature and hypoxia in shelf regions, Biogeosciences, 10, 5125-5138, https://doi.org/10.5194/bg-10-5125-2013, 2013.
Guiot, J.: Methodology of palaeoclimatic reconstruction from pollen in France, Palaeogeogr. Palaeocl., 80, 49–69, https://doi.org/10.1016/0031-0182(90)90033-4, 1990.
Gustafsson, B. G. and Westman, P.: On the causes for salinity variations in the Baltic Sea during the last 8500 years, Paleoceanography, 17, 12-1–12-14, https://doi.org/10.1029/2000PA000572, 2002.
Hammer, Ø., Harper, D. A. T., and Ryan, P. D.: PAST: Paleontological statistics software package for education and data analysis, Palaeontol. Electron., 4, 9 pp., 2001.
Hardisty, D. S., Riedinger, N., Planavsky, N. J., Asael, D., Andrén, T., Jørgensen, B. B., and Lyons, T. W.: A Holocene history of dynamic water column redox conditions in the Landsort Deep, Baltic Sea, Am. J. Sci., 316, 713–745, https://doi.org/10.2475/08.2016.01, 2016.
Harland, R. and Nordberg, K.: The identification, occurrence and importance of microreticulate dinoflagellate cysts in the latest Holocene sediments of the Skagerrak and Kattegat, west coast of Sweden, Rev. Palaeobot. Palyno., 164, 84–92, https://doi.org/10.1016/j.revpalbo.2010.11.009, 2011.
HELCOM: Water balance of the Baltic Sea, in: Baltic Sea Environment Proceedings, No. 16, edited by: Baltic Marine Environment Protection Commission, Helsinki Commission, Helsinki, Finland, 1986.
Henkes, G. A., Passey, B. H., Hopmans, E. C., Schouten, S., Pancost, R. D., van der Meer, M. T., Wanamaker, A. D., Grossman, E. L., Ambrose, W. G., and Carroll, M. L.: Carbonate clumped isotope compositions of modern marine mollusk and brachiopod shells, Geochim. Cosmochim. Ac., 106, 307–325, https://doi.org/10.1016/j.gca.2012.12.020, 2013.
Hopmans, E. C., Schouten, S., Pancost, R. D., van der Meer, M. T. J., and Sinninghe Damsté, J. S.: Analysis of intact tetraether lipids in archaeal cell material and sediments by high performance liquid chromatography/atmospheric pressure chemical ionization mass spectrometry, Rapid Commun. Mass Sp., 14, 585–589, https://doi.org/10.1002/(SICI)1097-0231(20000415)14:7<585::AID-RCM913>3.0.CO;2-N, 2000.
Hopmans, E. C., Weijers, J. W. H., Schefuß, E., Herfort, L., Sinninghe Damsté, J. S., and Schouten, S.: A novel proxy for terrestrial organic matter in sediments based on branched and isoprenoid tetraether lipids, Earth Planet. Sc. Lett., 224, 107–116, https://doi.org/10.1016/j.epsl.2004.05.012, 2004.
Huckriede, H. and Meischner, D.: Origin and environment of manganese-rich sediments within black-shale basins, Geochim. Cosmochim. Ac., 60, 1399–1413, https://doi.org/10.1016/0016-7037(96)00008-7, 1996.
Hurrell, J. W.: Decadal trends in the North Atlantic Oscillation: Region Temperatures and Precipitation, Science, 269, 676–679 https://doi.org/10.1126/science.269.5224.676, 1995.
ICES: Hydrochemistry, CTD and Bottle data portal, ICES, Copenhagen, 2017.
Iversen, J.: Viscum, Hedera and Ilex as Climate Indicators, Geol. Foren. Stock. For., 66, 463–483, https://doi.org/10.1080/11035894409445689, 1944.
Jakobsen, F. and Ottavi, J.: Transport through the contraction area in the Little Belt, Estuar. Coast. Shelf S., 45, 759–767, 1997.
Jonas, A. S., Schwark, L., and Bauersachs, T.: Late Quaternary water temperature variations of the Northwest Pacific based on the lipid paleothermometers TEXH86, UK′37 and LDI, Deep-Sea Res. Pt. II, 125, 81–93, 2017.
Kabel, K., Moros, M., Porsche, C., Neumann, T., Adolphi, F., Andersen, T. J., Siegel, H., Gerth, M., Leipe, T., Jansen, E.., and Sinninghe Damsté, J. S.: Impact of climate change on the Baltic Sea ecosystem over the past 1000 years, Nature Climate Change, 2, 871–874, https://doi.org/10.1038/nclimate1595, 2012.
Kim, J. H., van der Meer, J., Schouten, S., Helmke, P., Willmott, V., Sangiorgi, F., Koc, N., Hopmans, E. C., and Sinninghe Damsté, J. S.: New indices and calibrations derived from the distribution of crenarchaeal isoprenoid tetraether lipids: Implications for past sea surface temperature reconstructions, Geochim. Cosmochim. Ac., 74, 4639–4654, https://doi.org/10.1016/j.gca.2010.05.027, 2010.
Kim, J. H., Romero, O. E., Lohmann, G., Donner, B., Laepple, T., Haam, E., and Sinninghe Damsté, J. S.: Pronounced subsurface cooling of North Atlantic waters off Northwest Africa during DAnsgaard-Oeschger interstadials, Earth Planet. Sc. Lett., 339–340, 95–102, 2012.
Knudsen, K. L., Jiang, H., Gibbard, P. L., Kristensen, P., Seidenkrantz, M.-S., Janczyk-Kopikowa, Z., and Marks, L.: Environmental reconstructions of Eemian Stage interglacial marine records in the Lower Vistula area, southern Baltic Sea, Boreas, 41, 209–234, https://doi.org/10.1111/j.1502-3885.2011.00232.x, 2011.
Kotilainen, A. T., Arppe, L., Dobosz, S., Jansen, E., Kabel, K., Karhu, J., Kotilainen, M. M., Kuijpers, A., Lougheed, B. C., Meier, H. E. M., Moros, M., Neumann, T., Porsche, C., Poulsen, N., Rasmussen, P., Ribeiro, S., Risebrobakken, B., Ryabchuk, D., Schimanke, S., Snowball, I., Spiridonov, M., Virtasalo, J. J., Weckström, K., Witkowski, A., and Zhamoida, V.: Echoes from the Past: A Healthy Baltic Sea Requires More Effort, Ambio, 43, 60–68, https://doi.org/10.1007/s13280-013-0477-4, 2014.
Kotthoff, U., Pross J., Müller U.C., Peyron O., Schmiedl G., Schulz H., and Bordon A.: Climate dynamics in the borderlands of the Aegean Sea during formation of sapropel S1 deduced from a marine pollen record. Quaternary Sci. Rev., 27, 832–845, https://doi.org/10.1016/j.quascirev.2007.12.001, 2008.
Kotthoff, U., Koutsodendris, A., Pross, J., Schmiedl, G., Bornemann, A., Kaul, C., Marino, G., Peyron, O., and Schiebel, R.: Impact of late glacial cold events in the Northern Aegean region reconstructed from integrated marine and terrestrial proxy data, J. Quaternary Sci., 26, 86–96, https://doi.org/10.1002/jqs.1430, 2011.
Krammer, K. and Lange-Bertalot, H.: Bacillariophyceae. 1. Teil: Naviculaceae, in: Süsswasser flora von Mitteleuropa, Band 2/1, edited by: Ettl, H., Gerloff, J., Heynig, H., and Mollenhauer, D., Gustav Fischer Verlag, Stuttgart, New York, 876 pp., 1986.
Krammer, K. and Lange-Bertalot, H.: Bacillariophyceae. 2. Teil: Bacillariaceae, Epithemiaceae, Surirellaceae, in: Süsswasserflora von Mitteleuropa, Band 2/2, edited by: Ettl, H., Gerloff, J., Heynig, H., and Mollenhauer, D., Gustav Fischer Verlag, Stuttgart, Germany, 611 pp., 1988.
Krammer, K. and Lange-Bertalot, H.: Bacillariophyceae. 3. Teil: Centrales, Fragilariaceae, Eunotiaceae, in: Süsswasserflora von Mitteleuropa, Band 2/3, edited by: Ettl, H., Gerloff, J., Heynig, H., and Mollenhauer, D., Gustav Fischer Verlag, Stuttgart, 598 pp., 1991a.
Krammer, K. and Lange-Bertalot, H.: Bacillariophyceae. 4 Teil: Achnantaceae, in: Süßwasserflora von Mitteleuropa, Band 2/4, edited by: Ettl, H., Gerloff, J., Heynig, H., and Mollenhauer, D., Gustav Fischer Verlag, Stuttgart, 468 pp., 1991b.
Kristensen, P. H. and Knudsen, K. L.: Palaeoenvironments of a complete Eemian sequences at Mommark, South Denmark: foraminifera, ostracods and stable isotopes, Boreas, 35, 349–366, https://doi.org/10.1111/j.1502-3885.2006.tb01163.x, 2006.
Kristjánsdóttir, G. B., Lea, D. W., Jennings, A. E., Pak, D. K., and Belanger, C.: New spatial Mg ∕ Ca-temperature calibrations for three Arctic, benthic foraminifera and reconstruction of north Iceland shelf temperature for the past 4000 years, Geochem. Geophy. Geosy., 8, Q03P21, https://doi.org/10.1029/2006GC001425, 2007.
Krossa, V. R., Moros, M., Leduc, G., Hinz, M., Blanz, T., and Schneider, R.: Regional climate change and the onset of farming in northern Germany and southern Scandinavia, The Holocene, 27, 1589–1599, https://doi.org/10.1177/0959683617702223, 2017.
Kühl, N. and Moschen, R.: A combined pollen and δ18OSphagnum record of mid-Holocene climate variability from Dürres Maar (Eifel, Germany), The Holocene, 22, 1075–1085, https://doi.org/10.1177/0959683612441838, 2012.
Leppäranta, M. and Myrberg, K.: Physical oceanography of the Baltic Sea, Springer-Verlag Berlin Heidelberg, 378 pp., 2009.
Liu, X. L., Summons, R. E., and Hinrichs, K. U.: Extending the known range of glycerol ether lipids in the environment: structural assignments based on tandem mass spectral fragmentation patterns, Rapid Commun. Mass Sp., 26, 2295–2302, https://doi.org/10.1002/rcm.6355, 2012.
Lopes dos Santos, R. A., Spooner, M. I., Barrows, T. T., De Deckker, P., Sinninghe Damsté, J. S., and Schouten, S.: Comparison of organic (UK′37, TEXH86, LDI) and faunal proxies (foraminiferal assemblages) for reconstruction of late Quaternary sea surface temperature variability from offshore southeastern Australia, Paleoceanography, 28, 377–387, https://doi.org/10.1002/palo.20035, 2013.
Lutze, G.: Zur Foraminiferen-Fauna der Ostsee, Meyniana, 15, 75–142, https://doi.org/10.2312/meyniana.1965.15.75, 1965.
Lutze, G.: Foraminiferen der Kieler Bucht (Westliche Ostsee): 1 "Hausgartengebiet" des Sonderforschungsbereiches 95 der Universität Kiel, Meyniana, 26, 9–22, https://doi.org/10.2312/meyniana.1974.26.9, 1974.
Martin, P. A. and Lea, D. W.: simple evaluation of cleaning procedures on fossil benthic foraminiferal Mg ∕ Ca, Geochem. Geophy. Geosy., 3, 1–8, https://doi.org/10.1029/2001GC000280, 2002.
Matthäus, W. and Schinke, H.: The influence of river runoff on deep water conditions of the Baltic Sea, Hydrobiologia, 393, 1–10, https://doi.org/10.1023/A:1003573328473, 1999.
Mauri, A., Davis, B. A. S., Collins, P. M., and Kaplan, J. O.: The Climate of Europe during the Holocene: a gridded pollen-based reconstruction and its multi-proxy evaluation, Quaternary Sci. Rev., 112, 109–127, https://doi.org/10.1016/j.quascirev.2015.01.013, 2015.
Meier, H. E. M.: Projected Change – Marine Physics, in: Second Assessment of Climate Change for the Baltic Sea Basin, The BACC Author Team (Ed.), Springer, Cham, 243–252, https://doi.org/10.1007/978-3-319-16006-1, 2015.
Meier, H. E. M., Feistel, R., Piechura, J., Arneborg, L., Burchard, H., Fiekas, V., Golenko, N., Kuzmina, N., Mohrholz, V., Nohr, C., Paka, V. T., Sellschopp, J., Stips, A., and Zhurbas, V.: Ventilation of the Baltic Sea deep water: A brief review of present knowledge from observations and models, Oceanologia, 48, 133–164, 2006.
Meier, H. E. M., Müller-Karulis, B., Andersson, H. C., Dieterich, C., Eilola, K., Gustafsson, B. G., Höglund, A., Hordoir, R., Kuznetsov, I., Neumann, T., Ranjbar, Z., Savchuk, O. P., and Schimanke, S.: Impact of Climate Change on Ecological Quality Indicators and Biogeochemical Fluxes in the Baltic Sea: A Multi-Model Ensemble Study, Ambio, 41, 558–573, https://doi.org/10.1007/s13280-012-0320-3, 2012.
Michalak, A. M., Anderson, E. J., Beletsky, D., Boland, S., Bosch, N. S., Bridgeman, T. B., Chaffin, J. D., Cho, K., Confesor, R., Daloğlu, I., DePinto, J. V., Evans, M. A., Fahnenstiel, G. L., He, L., Ho, J. C., Jenkins, L., Johengen, T. H., Kuo, K. C., LaPorte, E., Liu, X., McWilliams, M. R., Moore, M. R., Posselt, D. J., Richards, R. P., Scavia, D., Steiner, A. L., Verhamme, E., Wright, D. M., and Zagorski, M. A.: Record-setting algal bloom in Lake Erie caused by agricultural and meteorological trends consistent with expected future conditions, P. Natl. Acad. Sci. USA., 110, 6448–6452, https://doi.org/10.1073/pnas.1216006110, 2013.
Mohrholz, V., Naumann, M., Nausch, G., Krüger, S., and Gräwe, U.: Fresh oxygen for the Baltic Sea – An exceptional saline inflow after a decade of stagnation, J. Mar. Sys., 148, 152–166, https://doi.org/10.1016/j.jmarsys.2015.03.005, 2015.
Mudie, P. J., Rochon, A., Aksu, A. E., and Gillespie, H.: Dinoflagellate cysts, freshwater algae and fungal spores as salinity indicators in Late Quaternary cores from Marmara and Black seas, Mar. Geol., 190, 203–231, https://doi.org/10.1016/S0025-3227(02)00348-1, 2002
Murray, J. W.: Ecology and Applications of Benthic Foraminifera, Cambridge University Press, Cambridge, 440 pp., 2006.
Ning, W., Ghosh, A., Jilbert, T., Slomp, J. P., Khan, M., Nyberg, J., Conley, D. J., and Filipsson, H. L.: Evolving coastal character of a Baltic Sea inlet during the Holocene shoreline regression: impact on coastal zone hypoxia, J. Paleolimnol., 55, 319–338, https://doi.org/10.1007/s10933-016-9882-6, 2016.
Ning, W., Andersson, P. S., Ghosh, A., Khan, M., Filipsson, H. L.: Quantitative salinity reconstructions of the Baltic Sea during the mid-Holocene, Boreas, 46, 100–110, https://doi.org/10.1111/bor.12156, 2017.
Omstedt, A., Meuller, L., and Nyberg, L.: Interannual, seasonal, and regional variations of precipitation and evaporation over the Baltic Sea, Ambio, 26, 484–492, 1997.
O'Neil, J. M., Davis, T. W., Burford, M. A., and Gobler, C. J.: The rise of harmful cyanobacteria blooms: The potential roles of eutrophication and climate change, Harmful Algae, 14, 313–334, https://doi.org/10.1016/j.hal.2011.10.027, 2012.
Passey, B. H., Levin, N. E., Cerling, T. E., Brown, F. H., Eiler, J. M., and Rendle-Bürhing, R.: High-temperature environments of human evolution in East Africa based on bond ordering in paleosol carbonates, P. Natl. Acad. Sci. USA, 107, 11245–11249, https://doi.org/10.1073/pnas.1001824107, 2010.
Patrick, R. and Reimer, C. W.: The Diatoms of the United States, Monographs of the Natural Academy of Sciences of Philadelphia, Number 13, 688 pp., https://doi.org/10.1002/iroh.19680530120, 1966.
Powers, L., Werne, J. P., Vanderwoude, A. J., Sinninghe Damsté, J. S., Hopmans, E. C., and Schouten, S.: Applicability and calibration of the TEX86 paleothermometer in lakes, Org. Geochem., 41, 404–413, https://doi.org/10.1016/j.orggeochem.2009.11.009, 2010.
Raiswell, R. and Canfield, D. E.: Sources of iron for pyrite formation in marine sediments, Am. J. Sci. 298, 219–245, 1998.
Raitzsch, M., Kuhnert, H., Groeneveld, J., and Bickert, T.: Benthic foraminifer Mg ∕ Ca anomalies in South Atlantic core top sediments and their implications for paleothermometry, Geochem. Geophy. Geosy., 9, Q05010, https://doi.org/10.1029/2007GC001788, 2008.
Rampen, S. W., Willmott, V., Kim, J.-H., Uliana E., Mollenhauer, G., Schefuß E., Sinninghe Damsté, J. S., and Schouten, S.: Long chain 1,13- and 1,15-diols as a potential proxy for palaeotemperature reconstruction, Geochim. Cosmochim. Ac., 84, 204–216, https://doi.org/10.1016/j.gca.2012.01.024, 2012.
Rampen, S. W., Datema, M., Rodrigo-Gámiz, M., Schouten, S., Reichart, G. J., and Sinninghe Damsté, J.S.: Sources and proxy potential of long chain alkyl diols in lacustrine environments, Geochim. Cosmochim. Ac., 144, 59–71, https://doi.org/10.1016/j.gca.2014.08.033, 2014.
Reimer, P. J., Bard, E., Bayliss, A., Beck, J. W., Blackwell, P. G., Bronk Ramsey, C., Buck, C. E., Cheng, H., Edwards, R. L., Friedrich, M., Grootes, P. M., Guilderson, T. P., Haflidason, H., Hajdas, I., Hatté, C., Heaton, T. J., Hoffmann, D. L., Hogg, A. G., Hughen, K. A., Kaiser, K. F., Kromer, B., Manning, S. W., Niu, M., Reimer, R. W., Richards, D. A., Scott, E. M., Southon, J. R., Staff, R. A., Turney, C. S. M., and van der Plicht, J.: IntCal13 and Marine13 radiocarbon age calibration curves 0–50,000 years cal BP, Radiocarbon, 55, 1869–1887, https://doi.org/10.2458/azu_js_rc.55.16947, 2013.
Rodrigo-Gámiz, M., Rampen, S. W., de Haas, H., Baas, M., Schouten, S., and Sinninghe Damsté, J. S.: Constraints on the applicability of the organic temperature proxies UK′37, TEX86 and LDI in the subpolar region around Iceland, Biogeosciences, 12, 6573–6590, https://doi.org/10.5194/bg-12-6573-2015, 2015.
Rütters, H., Sass, H., Cypionka, H., and Rullkötter, J.: Phospholipid analysis as a tool to study complex microbial communities in marine sediments, J. Microbiol. Meth., 48, 149–160, https://doi.org/10.1016/S0167-7012(01)00319-0, 2002.
Schöne, B. R.: The curse of physiology – challenges and opportunities in the interpretation of geochemical data from mollusk shells, Geo-Mar. Lett., 28, 269–285, https://doi.org/10.1007/s00367-008-0114-6, 2008.
Schouten, S., Hopmans, E. C., Schefuß, E., and Sinninghe Damsté, J. S.: Distributional variations in marine crenarchaeotal membrane lipids: a new tool for reconstructing ancient sea water temperatures?, Earth Planet. Sc. Lett., 204, 265–274, https://doi.org/10.1016/S0012-821X(02)00979-2, 2002.
Schouten, S., Hopmans, E. C., Rosell-Melé, A., et al.: An interlaboratory study of TEX86 and BIT analysis of sediments, extracts, and standard mixtures, Geochem. Geophy. Geosy., 14, 1–23, https://doi.org/10.1002/2013GC004904, 2013a.
Schouten, S., Hopmans, E. C., and Sinninghe Damsté, J. S.: The organic geochemistry of glycerol dialkyl glycerol tetraether lipids: a review, Org. Geochem., 54, 19–61, https://doi.org/10.1016/j.orggeochem.2012.09.006, 2013b.
Seidenkrantz, M.-S.: Subrecent changes in the foraminiferal distribution in the Kattegat and the Skagerrak, Scandinavia: anthropogenic influence and natural causes, Boreas, 22, 383–395, https://doi.org/10.1111/j.1502-3885.1993.tb00201.x, 1993.
Seppä, H., Hammarlund, D., and Antonsson, K.: Low-frequency and high-frequency changes in temperature and effective humidity during the Holocene in south-central Sweden: implications for atmospheric and oceanic forcings of climate, Clim. Dynam., 25, 285–297, https://doi.org/10.1007/s00382-005-0024-5, 2005.
Shen, C.-C., Hastings, D. W., Lee, T., Chiu, C.-H., Lee, M.-Y., Wei, K.-Y., and Edwards, R. L.: High precision glacial-interglacial benthic foraminiferal Sr ∕ Ca records from the eastern Atlantic Ocean and Caribbean Sea, Earth Planet. Sc. Lett., 190. 197–209, https://doi.org/10.1016/S0012-821X(01)00391-0, 2001.
Skirbekk, K., Hald, M., Marchitto, T. M., Junttila, J., Kristensen, D. K., and Sörensen, S. A.: Benthic foraminiferal growth seasons implied from Mg ∕ Ca-temperature correlations for three Arctic species, Geochem. Geophy. Geosy., 17, 4684–4704, 2016.
Snoeijs, P.: Intercalibration and distribution of diatom species in the Baltic Sea, Volume 1, OPULUS Press, Uppsala, 130 pp., 1993.
Snoeijs, P. and Balashova, N.: Intercalibration and distribution of diatom species in the Baltic Sea, Volume 5, OPULUS Press, Uppsala, 144 pp., 1998.
Snoeijs, P. and Kasperoviciene, J.: Intercalibration and distribution of diatom species in the Baltic Sea, Volume 4, OPULUS Press, Uppsala, 125 pp., 1996.
Snoeijs, P. and Potapova, M.: Intercalibration and distribution of diatom species in the Baltic Sea, Volume 3, OPULUS Press, Uppsala, 125 pp., 1995.
Snoeijs, P. and Vilbaste, S.: Intercalibration and distribution of diatom species in the Baltic Sea, Voulme 2, OPULUS Press, Uppsala, 125 pp., 1994.
Snoeijs, P. and Weckström, K.: Diatoms and environmental change in large brackish-water ecosystems, in: The Diatoms: Applications for the Environmental and Earth Sciences, edited by: Smol, J. P. and Stoermer, E F., Cambridge University Press, Cambridge, 287–308, https://doi.org/10.1017/CBO9780511763175.016, 2010.
Sohlenius, G., Sternbeck, J., Andrén, E., and Westman, P.: Holocene history of the Baltic Sea as recorded in a sediment core from the Gotland Deep, Mar. Geol., 134, 183–201, https://doi.org/10.1016/0025-3227(96)00047-3, 1996.
Steinke, S., Groeneveld, J., Johnstone, H., and Rendle-Bürhing, R.: East Asian summer monsoon weakening after 7.5 Ma: Evidence from combined planktonic foraminifera Mg ∕ Ca and δ18O (ODP Site 1146; northern South China Sea), Palaeogeogr. Palaeocl., 289, 33–43, https://doi.org/10.1016/j.palaeo.2010.02.007, 2010.
Stepanova, A., Taldenkova, E., Simstich, J., and Bauch, H. A.: Comparison study of the modern ostracod associations in the Kara and Laptev seas: Ecological aspects, Mar. Micropaleontol., 63, 111–142, https://doi.org/10.1016/j.marmicro.2006.10.003, 2007.
Stepanova, A. Y.: Ostracod valve counts at IODP Site 347-M0059 (Baltic Sea), upper 52.3 meters composite depth, PANGAEA, https://doi.org/10.1594/PANGAEA.873270, 2017.
Stockmarr, J.: Tablets with spores used in absolute pollen analysis, Pollen et Spores, 13, 615–21, 1971.
Thorsen, T. A. and Dale, B.: Dinoflagellate cysts as indicators of pollution and past climate in a Norwegian fjord, The Holocene, 7, 433–446, https://doi.org/10.1177/095968369700700406, 1997.
Thorsen, T. A., Dale, B., and Nordberg, K.: "Blooms" of the toxic dinoflagellate Gymnodinium catenatum as evidence of climatic fluctuations in the late Holocene of southwestern Scandinavia, The Holocene, 5, 435–446, https://doi.org/10.1177/095968369500500406, 1995.
Van Helmond, N. A. G. M., Krupinski, N. Q., Lougheed, B. C., Obrochta, S. P., Andrén, T., and Slomp, C. P.: Seasonal hypoxia was a natural feature of the coastal zone in the Little Belt, Denmark, during the past 8 ka, Mar. Geol., 387, 45–57, https://doi.org/10.1016/j.margeo.2017.03.008, 2017.
Van Santvoort, P. J. M., De Lange, G. J., Thomson, J., Colley, S., Meysman, F. J. R., and Slomp, C. P.: Oxidation and origin of organic matter in surficial eastern Mediterranean hemipelagic sediments, Aquat. Geochem., 8, 153–175, https://doi.org/10.1023/A:1024271706896, 2002.
Versteegh, G. J. M., Bosch, H. J., and de Leeuw, J. W.: Potential palaeoenvironmental information of C24 to C36 mid-chain diols, keto-ols and mid-chain hydroxy fatty acids; a critical review, Org. Geochem., 27, 1–13, https://doi.org/10.1016/S0146-6380(97)00063-6, 1997.
Viehberg, F. A., Frenzel, P., and Hoffmann, G.: Succession of late Pleistocene and Holocene ostracode assemblages in a transgressive environment: A study at a coastal locality of the southern Baltic Sea (Germany), Palaeogeogr. Palaeoclim., 264, 318–329, https://doi.org/10.1016/j.palaeo.2007.05.026, 2008.
Visbeck, M. H., Hurrel, J. W., Polvani, L., and Cullen, H. M.: The North Atlantic Oscillation: Past, present, and future, P. Natl. Acad. Sci. USA, 98, 12876–12877, https://doi.org/10.1073/pnas.231391598, 2001.
Volkman, J. K., Barrett, S. M., Dunstan, G. A., and Jeffrey, S. W.: C30-C32 alkyl diols and unsaturated alcohols in microalgae of the class Eustigmatophyceae, Org. Geochem., 18, 131–138, https://doi.org/10.1016/S0146-6380(99)00009-1, 1992.
Wacker, U., Fiebig, J., Tödter, J., Schöne, B. R., Bahr, A., Friedrich, O., Tütken, T., Gischler, E., and Joachimski, M. M.: Empirical calibration of the clumped isotope paleothermometer using calcites of various origins, Geochim. Cosmochim. Ac., 141, 127–144, https://doi.org/10.1016/j.gca.2014.06.004, 2014.
Warnock, J. P. and Scherer, R. P.: A revised method for determining the absolute abundance of diatoms, J. Paleolimnol., 53, 157–163, https://doi.org/10.1007/s10933-014-9808-0, 2015.
Warnock, J. P., Andrén, E., Bauersachs, T., Brandt, H.-T., and Kotthoff, U.: Holocene environmental history of the Ångermanälven Estuary, northern Baltic Sea, Boreas, https://doi.org/10.1111/bor.12281, online first, 2017.
Wasmund, N. and Uhlig, S.: Phytoplankton trends in the Baltic Sea, ICES J. Mar. Sci., 60, 177–186, https://doi.org/10.1016/S1054-3139(02)00280-1, 2003.
Weijers, J. W. H., Schouten, S., Spaargaren, O. C., and Sinninghe Damsté, J. S.: Occurrence and distribution of tetraether membrane lipids in soils: implications for the use of the TEX86 proxy and BIT index, Org. Geochem., 37, 1680–1693, https://doi.org/10.1016/j.orggeochem.2006.07.018, 2006.
Weijers, J. W. H., Lim, K. L. H., Aquilina, A., Sinninghe Damsté, J. S., and Pancost, R. D.: Biogeochemical controls on glycerol dialkyl glycerol tetraether lipid distributions in sediments characterized by diffusive methane flux, Geochem. Geophy. Geosy., 12, Q10010,https://doi.org/10.1029/2011GC003724, 2011.
Willumsen, P. S., Filipsson, H. L., Reinholdsson, M., and Lenz, C: Surface salinity and nutrient variations during the Littorina Stage in the Fårö Deep, Baltic Sea, Boreas, 42, 210–223, https://doi.org/10.1111/j.1502-3885.2012.00286.x, 2013.
Yu, S.-Y. and Berglund, B.-E.: A dinoflagellate cyst record of Holocene climate and hydrological changes along the southeastern Swedish Baltic coast, Quaternary Res., 67, 215–224, https://doi.org/10.1016/j.yqres.2006.12.004, 2007.
Zhang, Y. G., Zhang, C. L., Liu, X. L., Li, L., Hinrichs, K. U., and Noakes, J. E.: Methane Index: A tetraether archaeal lipid biomarker indicator for detecting the instability of marine gas hydrates, Earth Planet. Sc. Lett., 307, 525–534, 2011.
Zhu, C., Weijers, J. W. H., Wagner, T., Pan, J. M., Chen, J. F., and Pancost, R. D.: Sources and distributions of tetraether lipids in surface sediments across a large river-dominated continental margin, Org. Geochem., 42, 376–386, https://doi.org/10.1016/j.orggeochem.2011.02.002, 2011.
Zillén, L., Conley, D. J., Andrén, T., Andrén, E., and Björck, S.: Past occurrences of hypoxia in the Baltic Sea and the role of climate variability, environmental change and human impact, Earth-Sci. Rev., 91, 77–92, https://doi.org/10.1016/j.earscirev.2008.10.001, 2008.
Zink, K. G., Vandergoes, M. J., Bauersachs, T., Newnham, R. M., Rees, A. B. H., and Schwark, L.: A refined paleotemperature calibration for New Zealand limnic environments using differentiation of branched glycerol dialkyl glycerol tetraether (brGDGT) sources, J. Quaternary Sci., 31, 823–835, https://doi.org/10.1002/jqs.2908, 2016.
Short summary
We present reconstructions of paleotemperature, paleosalinity, and paleoecology from the Little Belt (Site M0059) over the past ~ 8000 years and evaluate the applicability of numerous proxies. Conditions were lacustrine until ~ 7400 cal yr BP. A transition to brackish–marine conditions then occurred within ~ 200 years. Salinity proxies rarely allowed quantitative estimates but revealed congruent results, while quantitative temperature reconstructions differed depending on the proxies used.
We present reconstructions of paleotemperature, paleosalinity, and paleoecology from the Little...
Altmetrics
Final-revised paper
Preprint