Articles | Volume 16, issue 15
https://doi.org/10.5194/bg-16-2961-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-16-2961-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Highly branched isoprenoids for Southern Ocean sea ice reconstructions: a pilot study from the Western Antarctic Peninsula
Maria-Elena Vorrath
CORRESPONDING AUTHOR
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine
Research, Bremerhaven, Germany
Juliane Müller
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine
Research, Bremerhaven, Germany
MARUM – Center for Marine Environmental Sciences, University of
Bremen, Bremen, Germany
Department of Geosciences, University of Bremen, Bremen, Germany
Oliver Esper
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine
Research, Bremerhaven, Germany
Gesine Mollenhauer
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine
Research, Bremerhaven, Germany
MARUM – Center for Marine Environmental Sciences, University of
Bremen, Bremen, Germany
Christian Haas
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine
Research, Bremerhaven, Germany
Enno Schefuß
MARUM – Center for Marine Environmental Sciences, University of
Bremen, Bremen, Germany
Kirsten Fahl
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine
Research, Bremerhaven, Germany
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Julia Rieke Hagemann, Lester Lembke-Jene, Frank Lamy, Maria-Elena Vorrath, Jérôme Kaiser, Juliane Müller, Helge W. Arz, Jens Hefter, Andrea Jaeschke, Nicoletta Ruggieri, and Ralf Tiedemann
Clim. Past, 19, 1825–1845, https://doi.org/10.5194/cp-19-1825-2023, https://doi.org/10.5194/cp-19-1825-2023, 2023
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Alkenones and glycerol dialkyl glycerol tetraether lipids (GDGTs) are common biomarkers for past water temperatures. In high latitudes, determining temperature reliably is challenging. We analyzed 33 Southern Ocean sediment surface samples and evaluated widely used global calibrations for both biomarkers. For GDGT-based temperatures, previously used calibrations best reflect temperatures >5° C; (sub)polar temperature bias necessitates a new calibration which better aligns with modern values.
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Xavier Crosta, Karen E. Kohfeld, Helen C. Bostock, Matthew Chadwick, Alice Du Vivier, Oliver Esper, Johan Etourneau, Jacob Jones, Amy Leventer, Juliane Müller, Rachael H. Rhodes, Claire S. Allen, Pooja Ghadi, Nele Lamping, Carina B. Lange, Kelly-Anne Lawler, David Lund, Alice Marzocchi, Katrin J. Meissner, Laurie Menviel, Abhilash Nair, Molly Patterson, Jennifer Pike, Joseph G. Prebble, Christina Riesselman, Henrik Sadatzki, Louise C. Sime, Sunil K. Shukla, Lena Thöle, Maria-Elena Vorrath, Wenshen Xiao, and Jiao Yang
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Despite its importance in the global climate, our knowledge of Antarctic sea-ice changes throughout the last glacial–interglacial cycle is extremely limited. As part of the Cycles of Sea Ice Dynamics in the Earth system (C-SIDE) Working Group, we review marine- and ice-core-based sea-ice proxies to provide insights into their applicability and limitations. By compiling published records, we provide information on Antarctic sea-ice dynamics over the past 130 000 years.
Nele Lamping, Juliane Müller, Jens Hefter, Gesine Mollenhauer, Christian Haas, Xiaoxu Shi, Maria-Elena Vorrath, Gerrit Lohmann, and Claus-Dieter Hillenbrand
Clim. Past, 17, 2305–2326, https://doi.org/10.5194/cp-17-2305-2021, https://doi.org/10.5194/cp-17-2305-2021, 2021
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Maria-Elena Vorrath, Juliane Müller, Lorena Rebolledo, Paola Cárdenas, Xiaoxu Shi, Oliver Esper, Thomas Opel, Walter Geibert, Práxedes Muñoz, Christian Haas, Gerhard Kuhn, Carina B. Lange, Gerrit Lohmann, and Gesine Mollenhauer
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We tested the applicability of the organic biomarker IPSO25 for sea ice reconstructions in the industrial era at the western Antarctic Peninsula. We successfully evaluated our data with satellite sea ice observations. The comparison with marine and ice core records revealed that sea ice interpretations must consider climatic and sea ice dynamics. Sea ice biomarker production is mainly influenced by the Southern Annular Mode, while the El Niño–Southern Oscillation seems to have a minor impact.
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Clim. Past Discuss., https://doi.org/10.5194/cp-2024-60, https://doi.org/10.5194/cp-2024-60, 2024
Preprint under review for CP
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In order to understand the mechanisms governing permafrost organic matter re-mobilization, we investigated organic matter composition during past intervals of rapid sea-level rise, of inland warming, and of dense sea-ice cover in the Laptev Sea. We find that sea-level rise resulted in wide-spread erosion and transport of permafrost materials to the ocean, but erosion is mitigated by regional dense sea ice cover. Factors like inland warming or floods increase permafrost mobilization locally.
Yi Zhou, Xianwei Wang, Ruibo Lei, Arttu Jutila, Donald K. Perovich, Luisa von Albedyll, Dmitry V. Divine, Yu Zhang, and Christian Haas
EGUsphere, https://doi.org/10.5194/egusphere-2024-2821, https://doi.org/10.5194/egusphere-2024-2821, 2024
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This study examines how the bulk density of Arctic sea ice varies seasonally, a factor often overlooked in satellite measurements of sea ice thickness. From October to April, we found significant seasonal variations in sea ice bulk density at different spatial scales using direct observations as well as airborne and satellite data. New models were then developed to indirectly predict sea ice bulk density. This advance can improve our ability to monitor changes in Arctic sea ice.
Bennet Juhls, Anne Morgenstern, Jens Hölemann, Antje Eulenburg, Birgit Heim, Frederieke Miesner, Hendrik Grotheer, Gesine Mollenhauer, Hanno Meyer, Ephraim Erkens, Felica Yara Gehde, Sofia Antonova, Sergey Chalov, Maria Tereshina, Oxana Erina, Evgeniya Fingert, Ekaterina Abramova, Tina Sanders, Liudmila Lebedeva, Nikolai Torgovkin, Georgii Maksimov, Vasily Povazhnyi, Rafael Gonçalves-Araujo, Urban Wünsch, Antonina Chetverova, Sophie Opfergelt, and Pier Paul Overduin
Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2024-290, https://doi.org/10.5194/essd-2024-290, 2024
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The Siberian Arctic is warming fast: permafrost is thawing, river chemistry is changing, and coastal ecosystems are affected. We want to understand changes to the Lena River, a major Arctic river flowing to the Arctic Ocean, by collecting 4.5 years of detailed water data, including temperature and carbon and nutrient contents. This dataset records current conditions and helps us to detect future changes. Explore it at https://doi.org/10.1594/PANGAEA.913197 and https://lena-monitoring.awi.de/.
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
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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.
Rui Xu, Chaofang Zhao, Stefanie Arndt, and Christian Haas
EGUsphere, https://doi.org/10.5194/egusphere-2024-2054, https://doi.org/10.5194/egusphere-2024-2054, 2024
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The Cryosphere, 18, 3049–3066, https://doi.org/10.5194/tc-18-3049-2024, https://doi.org/10.5194/tc-18-3049-2024, 2024
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We use the authigenic 10Be/9Be record of a Laptev Sea sediment core for the period 8–14 kyr BP and synchronize it with the 10Be records from absolutely dated ice cores. We employed a likelihood function to calculate the ΔR values. A benthic ΔR value of +345±60 14C years was estimated, which corresponds to a marine reservoir age of 848±90 14C years. This new ΔR value was used to refine the age-depth model for core PS2458-4, establishing it as a potential reference chronology for the Laptev Sea.
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The Cryosphere, 18, 2991–3015, https://doi.org/10.5194/tc-18-2991-2024, https://doi.org/10.5194/tc-18-2991-2024, 2024
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Melt ponds are key components of the Arctic sea ice system, yet methods to derive comprehensive pond depth data are missing. We present a shallow-water bathymetry retrieval to derive this elementary pond property at high spatial resolution from aerial images. The retrieval method is presented in a user-friendly way to facilitate replication. Furthermore, we provide pond properties on the MOSAiC expedition floe, giving insights into the three-dimensional pond evolution before and after drainage.
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EGUsphere, https://doi.org/10.5194/egusphere-2024-1356, https://doi.org/10.5194/egusphere-2024-1356, 2024
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Yi Zhou, Xianwei Wang, Ruibo Lei, Luisa von Albedyll, Donald K. Perovich, Yu Zhang, and Christian Haas
EGUsphere, https://doi.org/10.5194/egusphere-2024-1240, https://doi.org/10.5194/egusphere-2024-1240, 2024
Preprint archived
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This study examines how the density of Arctic sea ice varies seasonally, a factor often overlooked in satellite measurements of sea ice thickness. From October to April, using direct observations and satellite data, we found that sea ice density decreases significantly until mid-January due to increased porosity as the ice ages, and then stabilizes until April. We then developed new models to estimate sea ice density. This advance can improve our ability to monitor changes in Arctic sea ice.
Karl Kortum, Suman Singha, Gunnar Spreen, Nils Hutter, Arttu Jutila, and Christian Haas
The Cryosphere, 18, 2207–2222, https://doi.org/10.5194/tc-18-2207-2024, https://doi.org/10.5194/tc-18-2207-2024, 2024
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A dataset of 20 radar satellite acquisitions and near-simultaneous helicopter-based surveys of the ice topography during the MOSAiC expedition is constructed and used to train a variety of deep learning algorithms. The results give realistic insights into the accuracy of retrieval of measured ice classes using modern deep learning models. The models able to learn from the spatial distribution of the measured sea ice classes are shown to have a clear advantage over those that cannot.
Luisa von Albedyll, Stefan Hendricks, Nils Hutter, Dmitrii Murashkin, Lars Kaleschke, Sascha Willmes, Linda Thielke, Xiangshan Tian-Kunze, Gunnar Spreen, and Christian Haas
The Cryosphere, 18, 1259–1285, https://doi.org/10.5194/tc-18-1259-2024, https://doi.org/10.5194/tc-18-1259-2024, 2024
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Leads (openings in sea ice cover) are created by sea ice dynamics. Because they are important for many processes in the Arctic winter climate, we aim to detect them with satellites. We present two new techniques to detect lead widths of a few hundred meters at high spatial resolution (700 m) and independent of clouds or sun illumination. We use the MOSAiC drift 2019–2020 in the Arctic for our case study and compare our new products to other existing lead products.
Vera Dorothee Meyer, Jürgen Pätzold, Gesine Mollenhauer, Isla S. Castañeda, Stefan Schouten, and Enno Schefuß
Clim. Past, 20, 523–546, https://doi.org/10.5194/cp-20-523-2024, https://doi.org/10.5194/cp-20-523-2024, 2024
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The climatic factors sustaining vegetation in the Sahara during the African humid period (AHP) are still not fully understood. Using biomarkers in a marine sediment core from the eastern Mediterranean, we infer variations in Mediterranean (winter) and monsoonal (summer) rainfall in the Nile river watershed around the AHP. We find that winter and summer rain enhanced during the AHP, suggesting that Mediterranean moisture supported the monsoon in sustaining the “green Sahara”.
Wee Wei Khoo, Juliane Müller, Oliver Esper, Wenshen Xiao, Christian Stepanek, Paul Gierz, Gerrit Lohmann, Walter Geibert, Jens Hefter, and Gesine Mollenhauer
EGUsphere, https://doi.org/10.5194/egusphere-2024-246, https://doi.org/10.5194/egusphere-2024-246, 2024
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Using a multiproxy approach, we analyzed biomarkers and diatom assemblages from a marine sediment core from the Powell Basin, Weddell Sea. The results reveal the first continuous coastal Antarctic sea ice record since the Last Penultimate Glacial. Our findings contribute valuable insights into past glacial-interglacial sea ice response to a changing climate and enhance our understanding of the ocean-sea ice-ice shelf interactions and dynamics.
Eduardo Queiroz Alves, Wanyee Wong, Jens Hefter, Hendrik Grotheer, Tommaso Tesi, Torben Gentz, Karin Zonneveld, and Gesine Mollenhauer
Clim. Past, 20, 121–136, https://doi.org/10.5194/cp-20-121-2024, https://doi.org/10.5194/cp-20-121-2024, 2024
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Our study reveals a previously unknown peat source for the massive influx of terrestrial organic matter that was exported from the European continent to the ocean during the last deglaciation. Our findings shed light on ancient terrestrial organic carbon mobilization, providing insights that are crucial for refining climate models.
Julia Rieke Hagemann, Lester Lembke-Jene, Frank Lamy, Maria-Elena Vorrath, Jérôme Kaiser, Juliane Müller, Helge W. Arz, Jens Hefter, Andrea Jaeschke, Nicoletta Ruggieri, and Ralf Tiedemann
Clim. Past, 19, 1825–1845, https://doi.org/10.5194/cp-19-1825-2023, https://doi.org/10.5194/cp-19-1825-2023, 2023
Short summary
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Alkenones and glycerol dialkyl glycerol tetraether lipids (GDGTs) are common biomarkers for past water temperatures. In high latitudes, determining temperature reliably is challenging. We analyzed 33 Southern Ocean sediment surface samples and evaluated widely used global calibrations for both biomarkers. For GDGT-based temperatures, previously used calibrations best reflect temperatures >5° C; (sub)polar temperature bias necessitates a new calibration which better aligns with modern values.
Maria-Elena Vorrath, Juliane Müller, Paola Cárdenas, Thomas Opel, Sebastian Mieruch, Oliver Esper, Lester Lembke-Jene, Johan Etourneau, Andrea Vieth-Hillebrand, Niko Lahajnar, Carina B. Lange, Amy Leventer, Dimitris Evangelinos, Carlota Escutia, and Gesine Mollenhauer
Clim. Past, 19, 1061–1079, https://doi.org/10.5194/cp-19-1061-2023, https://doi.org/10.5194/cp-19-1061-2023, 2023
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Sea ice is important to stabilize the ice sheet in Antarctica. To understand how the global climate and sea ice were related in the past we looked at ancient molecules (IPSO25) from sea-ice algae and other species whose dead cells accumulated on the ocean floor over time. With chemical analyses we could reconstruct the history of sea ice and ocean temperatures of the past 14 000 years. We found out that sea ice became less as the ocean warmed, and more phytoplankton grew towards today's level.
Olga Ogneva, Gesine Mollenhauer, Bennet Juhls, Tina Sanders, Juri Palmtag, Matthias Fuchs, Hendrik Grotheer, Paul J. Mann, and Jens Strauss
Biogeosciences, 20, 1423–1441, https://doi.org/10.5194/bg-20-1423-2023, https://doi.org/10.5194/bg-20-1423-2023, 2023
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Arctic warming accelerates permafrost thaw and release of terrestrial organic matter (OM) via rivers to the Arctic Ocean. We compared particulate organic carbon (POC), total suspended matter, and C isotopes (δ13C and Δ14C of POC) in the Lena delta and Lena River along a ~1600 km transect. We show that the Lena delta, as an interface between the Lena River and the Arctic Ocean, plays a crucial role in determining the qualitative and quantitative composition of OM discharged into the Arctic Ocean.
Mengli Cao, Jens Hefter, Ralf Tiedemann, Lester Lembke-Jene, Vera D. Meyer, and Gesine Mollenhauer
Clim. Past, 19, 159–178, https://doi.org/10.5194/cp-19-159-2023, https://doi.org/10.5194/cp-19-159-2023, 2023
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We use sediment records of lignin to reconstruct deglacial vegetation change and permafrost mobilization, which occurred earlier in the Yukon than in the Amur river basin. Sea ice extent or surface temperatures of adjacent oceans might have had a strong influence on the timing of permafrost mobilization. In contrast to previous evidence, our records imply that during glacial peaks of permafrost decomposition, lipids and lignin might have been delivered to the ocean by identical processes.
Julian Gutt, Stefanie Arndt, David Keith Alan Barnes, Horst Bornemann, Thomas Brey, Olaf Eisen, Hauke Flores, Huw Griffiths, Christian Haas, Stefan Hain, Tore Hattermann, Christoph Held, Mario Hoppema, Enrique Isla, Markus Janout, Céline Le Bohec, Heike Link, Felix Christopher Mark, Sebastien Moreau, Scarlett Trimborn, Ilse van Opzeeland, Hans-Otto Pörtner, Fokje Schaafsma, Katharina Teschke, Sandra Tippenhauer, Anton Van de Putte, Mia Wege, Daniel Zitterbart, and Dieter Piepenburg
Biogeosciences, 19, 5313–5342, https://doi.org/10.5194/bg-19-5313-2022, https://doi.org/10.5194/bg-19-5313-2022, 2022
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Long-term ecological observations are key to assess, understand and predict impacts of environmental change on biotas. We present a multidisciplinary framework for such largely lacking investigations in the East Antarctic Southern Ocean, combined with case studies, experimental and modelling work. As climate change is still minor here but is projected to start soon, the timely implementation of this framework provides the unique opportunity to document its ecological impacts from the very onset.
Matthew Chadwick, Xavier Crosta, Oliver Esper, Lena Thöle, and Karen E. Kohfeld
Clim. Past, 18, 1815–1829, https://doi.org/10.5194/cp-18-1815-2022, https://doi.org/10.5194/cp-18-1815-2022, 2022
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Algae preserved in seafloor sediments have allowed us to reconstruct how Antarctic sea ice has varied between cold and warm time periods in the last 130 000 years. The patterns and timings of sea-ice increase and decrease vary between different parts of the Southern Ocean. Sea ice is most sensitive to changing climate at the external edges of Southern Ocean gyres (large areas of rotating ocean currents).
Helen Eri Amsler, Lena Mareike Thöle, Ingrid Stimac, Walter Geibert, Minoru Ikehara, Gerhard Kuhn, Oliver Esper, and Samuel Laurent Jaccard
Clim. Past, 18, 1797–1813, https://doi.org/10.5194/cp-18-1797-2022, https://doi.org/10.5194/cp-18-1797-2022, 2022
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We present sedimentary redox-sensitive trace metal records from five sediment cores retrieved from the SW Indian Ocean. These records are indicative of oxygen-depleted conditions during cold periods and enhanced oxygenation during interstadials. Our results thus suggest that deep-ocean oxygenation changes were mainly controlled by ocean ventilation and that a generally more sluggish circulation contributed to sequestering remineralized carbon away from the atmosphere during glacial periods.
Xavier Crosta, Karen E. Kohfeld, Helen C. Bostock, Matthew Chadwick, Alice Du Vivier, Oliver Esper, Johan Etourneau, Jacob Jones, Amy Leventer, Juliane Müller, Rachael H. Rhodes, Claire S. Allen, Pooja Ghadi, Nele Lamping, Carina B. Lange, Kelly-Anne Lawler, David Lund, Alice Marzocchi, Katrin J. Meissner, Laurie Menviel, Abhilash Nair, Molly Patterson, Jennifer Pike, Joseph G. Prebble, Christina Riesselman, Henrik Sadatzki, Louise C. Sime, Sunil K. Shukla, Lena Thöle, Maria-Elena Vorrath, Wenshen Xiao, and Jiao Yang
Clim. Past, 18, 1729–1756, https://doi.org/10.5194/cp-18-1729-2022, https://doi.org/10.5194/cp-18-1729-2022, 2022
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Despite its importance in the global climate, our knowledge of Antarctic sea-ice changes throughout the last glacial–interglacial cycle is extremely limited. As part of the Cycles of Sea Ice Dynamics in the Earth system (C-SIDE) Working Group, we review marine- and ice-core-based sea-ice proxies to provide insights into their applicability and limitations. By compiling published records, we provide information on Antarctic sea-ice dynamics over the past 130 000 years.
Julia Gensel, Marc Steven Humphries, Matthias Zabel, David Sebag, Annette Hahn, and Enno Schefuß
Biogeosciences, 19, 2881–2902, https://doi.org/10.5194/bg-19-2881-2022, https://doi.org/10.5194/bg-19-2881-2022, 2022
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We investigated organic matter (OM) and plant-wax-derived biomarkers in sediments and plants along the Mkhuze River to constrain OM's origin and transport pathways within South Africa's largest freshwater wetland. Presently, it efficiently captures OM, so neither transport from upstream areas nor export from the swamp occurs. Thus, we emphasize that such geomorphological features can alter OM provenance, questioning the assumption of watershed-integrated information in downstream sediments.
Stefan Mulitza, Torsten Bickert, Helen C. Bostock, Cristiano M. Chiessi, Barbara Donner, Aline Govin, Naomi Harada, Enqing Huang, Heather Johnstone, Henning Kuhnert, Michael Langner, Frank Lamy, Lester Lembke-Jene, Lorraine Lisiecki, Jean Lynch-Stieglitz, Lars Max, Mahyar Mohtadi, Gesine Mollenhauer, Juan Muglia, Dirk Nürnberg, André Paul, Carsten Rühlemann, Janne Repschläger, Rajeev Saraswat, Andreas Schmittner, Elisabeth L. Sikes, Robert F. Spielhagen, and Ralf Tiedemann
Earth Syst. Sci. Data, 14, 2553–2611, https://doi.org/10.5194/essd-14-2553-2022, https://doi.org/10.5194/essd-14-2553-2022, 2022
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Stable isotope ratios of foraminiferal shells from deep-sea sediments preserve key information on the variability of ocean circulation and ice volume. We present the first global atlas of harmonized raw downcore oxygen and carbon isotope ratios of various planktonic and benthic foraminiferal species. The atlas is a foundation for the analyses of the history of Earth system components, for finding future coring sites, and for teaching marine stratigraphy and paleoceanography.
Charlotte Haugk, Loeka L. Jongejans, Kai Mangelsdorf, Matthias Fuchs, Olga Ogneva, Juri Palmtag, Gesine Mollenhauer, Paul J. Mann, P. Paul Overduin, Guido Grosse, Tina Sanders, Robyn E. Tuerena, Lutz Schirrmeister, Sebastian Wetterich, Alexander Kizyakov, Cornelia Karger, and Jens Strauss
Biogeosciences, 19, 2079–2094, https://doi.org/10.5194/bg-19-2079-2022, https://doi.org/10.5194/bg-19-2079-2022, 2022
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Buried animal and plant remains (carbon) from the last ice age were freeze-locked in permafrost. At an extremely fast eroding permafrost cliff in the Lena Delta (Siberia), we found this formerly frozen carbon well preserved. Our results show that ongoing degradation releases substantial amounts of this carbon, making it available for future carbon emissions. This mobilisation at the studied cliff and also similarly eroding sites bear the potential to affect rivers and oceans negatively.
Gerard J. M. Versteegh, Karin A. F. Zonneveld, Jens Hefter, Oscar E. Romero, Gerhard Fischer, and Gesine Mollenhauer
Biogeosciences, 19, 1587–1610, https://doi.org/10.5194/bg-19-1587-2022, https://doi.org/10.5194/bg-19-1587-2022, 2022
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A 5-year record of long-chain mid-chain diol export flux and composition is presented with a 1- to 3-week resolution sediment trap CBeu (in the NW African upwelling). All environmental parameters as well as the diol composition are dominated by the seasonal cycle, albeit with different phase relations for temperature and upwelling. Most diol-based proxies are dominated by upwelling. The long-chain diol index reflects temperatures of the oligotrophic summer sea surface.
Klaus Dethloff, Wieslaw Maslowski, Stefan Hendricks, Younjoo J. Lee, Helge F. Goessling, Thomas Krumpen, Christian Haas, Dörthe Handorf, Robert Ricker, Vladimir Bessonov, John J. Cassano, Jaclyn Clement Kinney, Robert Osinski, Markus Rex, Annette Rinke, Julia Sokolova, and Anja Sommerfeld
The Cryosphere, 16, 981–1005, https://doi.org/10.5194/tc-16-981-2022, https://doi.org/10.5194/tc-16-981-2022, 2022
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Sea ice thickness anomalies during the MOSAiC (Multidisciplinary drifting Observatory for the Study of Arctic Climate) winter in January, February and March 2020 were simulated with the coupled Regional Arctic climate System Model (RASM) and compared with CryoSat-2/SMOS satellite data. Hindcast and ensemble simulations indicate that the sea ice anomalies are driven by nonlinear interactions between ice growth processes and wind-driven sea-ice transports, with dynamics playing a dominant role.
Arttu Jutila, Stefan Hendricks, Robert Ricker, Luisa von Albedyll, Thomas Krumpen, and Christian Haas
The Cryosphere, 16, 259–275, https://doi.org/10.5194/tc-16-259-2022, https://doi.org/10.5194/tc-16-259-2022, 2022
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Sea-ice thickness retrieval from satellite altimeters relies on assumed sea-ice density values because density cannot be measured from space. We derived bulk densities for different ice types using airborne laser, radar, and electromagnetic induction sounding measurements. Compared to previous studies, we found high bulk density values due to ice deformation and younger ice cover. Using sea-ice freeboard, we derived a sea-ice bulk density parameterisation that can be applied to satellite data.
Nele Lamping, Juliane Müller, Jens Hefter, Gesine Mollenhauer, Christian Haas, Xiaoxu Shi, Maria-Elena Vorrath, Gerrit Lohmann, and Claus-Dieter Hillenbrand
Clim. Past, 17, 2305–2326, https://doi.org/10.5194/cp-17-2305-2021, https://doi.org/10.5194/cp-17-2305-2021, 2021
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We analysed biomarker concentrations on surface sediment samples from the Antarctic continental margin. Highly branched isoprenoids and GDGTs are used for reconstructing recent sea-ice distribution patterns and ocean temperatures respectively. We compared our biomarker-based results with data obtained from satellite observations and estimated from a numerical model and find reasonable agreements. Further, we address caveats and provide recommendations for future investigations.
Stefanie Arndt, Christian Haas, Hanno Meyer, Ilka Peeken, and Thomas Krumpen
The Cryosphere, 15, 4165–4178, https://doi.org/10.5194/tc-15-4165-2021, https://doi.org/10.5194/tc-15-4165-2021, 2021
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We present here snow and ice core data from the northwestern Weddell Sea in late austral summer 2019, which allow insights into possible reasons for the recent low summer sea ice extent in the Weddell Sea. We suggest that the fraction of superimposed ice and snow ice can be used here as a sensitive indicator. However, snow and ice properties were not exceptional, suggesting that the summer surface energy balance and related seasonal transition of snow properties have changed little in the past.
Thomas Krumpen, Luisa von Albedyll, Helge F. Goessling, Stefan Hendricks, Bennet Juhls, Gunnar Spreen, Sascha Willmes, H. Jakob Belter, Klaus Dethloff, Christian Haas, Lars Kaleschke, Christian Katlein, Xiangshan Tian-Kunze, Robert Ricker, Philip Rostosky, Janna Rückert, Suman Singha, and Julia Sokolova
The Cryosphere, 15, 3897–3920, https://doi.org/10.5194/tc-15-3897-2021, https://doi.org/10.5194/tc-15-3897-2021, 2021
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We use satellite data records collected along the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) drift to categorize ice conditions that shaped and characterized the floe and surroundings during the expedition. A comparison with previous years is made whenever possible. The aim of this analysis is to provide a basis and reference for subsequent research in the six main research areas of atmosphere, ocean, sea ice, biogeochemistry, remote sensing and ecology.
H. Jakob Belter, Thomas Krumpen, Luisa von Albedyll, Tatiana A. Alekseeva, Gerit Birnbaum, Sergei V. Frolov, Stefan Hendricks, Andreas Herber, Igor Polyakov, Ian Raphael, Robert Ricker, Sergei S. Serovetnikov, Melinda Webster, and Christian Haas
The Cryosphere, 15, 2575–2591, https://doi.org/10.5194/tc-15-2575-2021, https://doi.org/10.5194/tc-15-2575-2021, 2021
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Summer sea ice thickness observations based on electromagnetic induction measurements north of Fram Strait show a 20 % reduction in mean and modal ice thickness from 2001–2020. The observed variability is caused by changes in drift speeds and consequential variations in sea ice age and number of freezing-degree days. Increased ocean heat fluxes measured upstream in the source regions of Arctic ice seem to precondition ice thickness, which is potentially still measurable more than a year later.
Charlotte L. Spencer-Jones, Erin L. McClymont, Nicole J. Bale, Ellen C. Hopmans, Stefan Schouten, Juliane Müller, E. Povl Abrahamsen, Claire Allen, Torsten Bickert, Claus-Dieter Hillenbrand, Elaine Mawbey, Victoria Peck, Aleksandra Svalova, and James A. Smith
Biogeosciences, 18, 3485–3504, https://doi.org/10.5194/bg-18-3485-2021, https://doi.org/10.5194/bg-18-3485-2021, 2021
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Long-term ocean temperature records are needed to fully understand the impact of West Antarctic Ice Sheet collapse. Glycerol dialkyl glycerol tetraethers (GDGTs) are powerful tools for reconstructing ocean temperature but can be difficult to apply to the Southern Ocean. Our results show active GDGT synthesis in relatively warm depths of the ocean. This research improves the application of GDGT palaeoceanographic proxies in the Southern Ocean.
Gemma M. Brett, Gregory H. Leonard, Wolfgang Rack, Christian Haas, Patricia J. Langhorne, and Anne Irvin
The Cryosphere Discuss., https://doi.org/10.5194/tc-2021-61, https://doi.org/10.5194/tc-2021-61, 2021
Manuscript not accepted for further review
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Using a geophysical technique, we observe temporal variability in the influence of ice shelf meltwater on coastal sea ice which forms platelet ice crystals which contribute to the thickness of the sea ice and accumulate into a thick mass called a sub-ice platelet layer (SIPL). The variability observed in the SIPL indicated that circulation of ice shelf meltwater out from the cavity in McMurdo Sound is influenced by tides and strong offshore winds which affect surface ocean circulation.
Luisa von Albedyll, Christian Haas, and Wolfgang Dierking
The Cryosphere, 15, 2167–2186, https://doi.org/10.5194/tc-15-2167-2021, https://doi.org/10.5194/tc-15-2167-2021, 2021
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Convergent sea ice motion produces a thick ice cover through ridging. We studied sea ice deformation derived from high-resolution satellite imagery and related it to the corresponding thickness change. We found that deformation explains the observed dynamic thickness change. We show that deformation can be used to model realistic ice thickness distributions. Our results revealed new relationships between thickness redistribution and deformation that could improve sea ice models.
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
Christian Haas, Patricia J. Langhorne, Wolfgang Rack, Greg H. Leonard, Gemma M. Brett, Daniel Price, Justin F. Beckers, and Alex J. Gough
The Cryosphere, 15, 247–264, https://doi.org/10.5194/tc-15-247-2021, https://doi.org/10.5194/tc-15-247-2021, 2021
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We developed a method to remotely detect proxy signals of Antarctic ice shelf melt under adjacent sea ice. It is based on aircraft surveys with electromagnetic induction sounding. We found year-to-year variability of the ice shelf melt proxy in McMurdo Sound and spatial fine structure that support assumptions about the melt of the McMurdo Ice Shelf. With this method it will be possible to map and detect locations of intense ice shelf melt along the coast of Antarctica.
Maria-Elena Vorrath, Juliane Müller, Lorena Rebolledo, Paola Cárdenas, Xiaoxu Shi, Oliver Esper, Thomas Opel, Walter Geibert, Práxedes Muñoz, Christian Haas, Gerhard Kuhn, Carina B. Lange, Gerrit Lohmann, and Gesine Mollenhauer
Clim. Past, 16, 2459–2483, https://doi.org/10.5194/cp-16-2459-2020, https://doi.org/10.5194/cp-16-2459-2020, 2020
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We tested the applicability of the organic biomarker IPSO25 for sea ice reconstructions in the industrial era at the western Antarctic Peninsula. We successfully evaluated our data with satellite sea ice observations. The comparison with marine and ice core records revealed that sea ice interpretations must consider climatic and sea ice dynamics. Sea ice biomarker production is mainly influenced by the Southern Annular Mode, while the El Niño–Southern Oscillation seems to have a minor impact.
Sebastian Wetterich, Alexander Kizyakov, Michael Fritz, Juliane Wolter, Gesine Mollenhauer, Hanno Meyer, Matthias Fuchs, Aleksei Aksenov, Heidrun Matthes, Lutz Schirrmeister, and Thomas Opel
The Cryosphere, 14, 4525–4551, https://doi.org/10.5194/tc-14-4525-2020, https://doi.org/10.5194/tc-14-4525-2020, 2020
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In the present study, we analysed geochemical and sedimentological properties of relict permafrost and ground ice exposed at the Sobo-Sise Yedoma cliff in the eastern Lena delta in NE Siberia. We obtained insight into permafrost aggradation and degradation over the last approximately 52 000 years and the climatic and morphodynamic controls on regional-scale permafrost dynamics of the central Laptev Sea coastal region.
Joshua King, Stephen Howell, Mike Brady, Peter Toose, Chris Derksen, Christian Haas, and Justin Beckers
The Cryosphere, 14, 4323–4339, https://doi.org/10.5194/tc-14-4323-2020, https://doi.org/10.5194/tc-14-4323-2020, 2020
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Physical measurements of snow on sea ice are sparse, making it difficulty to evaluate satellite estimates or model representations. Here, we introduce new measurements of snow properties on sea ice to better understand variability at distances less than 200 m. Our work shows that similarities in the snow structure are found at longer distances on younger ice than older ice.
Bingbing Wei, Guodong Jia, Jens Hefter, Manyu Kang, Eunmi Park, Shizhu Wang, and Gesine Mollenhauer
Biogeosciences, 17, 4489–4508, https://doi.org/10.5194/bg-17-4489-2020, https://doi.org/10.5194/bg-17-4489-2020, 2020
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This research reports the applicability of four organic temperature proxies (U37K', LDI, TEX86H, and RI-OH) to the northern South China Sea shelf. The comparison with local sea surface temperature (SST) indicates the impact of terrestrial input on LDI, TEX86H, and RI-OH proxies near the coast. After excluding samples influenced by terrestrial materials, proxy temperatures exhibit different seasonality, providing valuable tools to reconstruct regional SSTs under different monsoonal conditions.
Heike H. Zimmermann, Kathleen R. Stoof-Leichsenring, Stefan Kruse, Juliane Müller, Ruediger Stein, Ralf Tiedemann, and Ulrike Herzschuh
Ocean Sci., 16, 1017–1032, https://doi.org/10.5194/os-16-1017-2020, https://doi.org/10.5194/os-16-1017-2020, 2020
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This study targets high-resolution, diatom-specific sedimentary ancient DNA using a DNA metabarcoding approach. Diatom DNA has been preserved with substantial taxonomic richness in the eastern Fram Strait over the past 30 000 years with taxonomic composition being dominated by cold-water and sea-ice-associated diatoms. Taxonomic reorganisations took place after the Last Glacial Maximum and after the Younger Dryas. Peak proportions of pennate diatoms might indicate past sea-ice presence.
H. Jakob Belter, Thomas Krumpen, Stefan Hendricks, Jens Hoelemann, Markus A. Janout, Robert Ricker, and Christian Haas
The Cryosphere, 14, 2189–2203, https://doi.org/10.5194/tc-14-2189-2020, https://doi.org/10.5194/tc-14-2189-2020, 2020
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The validation of satellite sea ice thickness (SIT) climate data records with newly acquired moored sonar SIT data shows that satellite products provide modal rather than mean SIT in the Laptev Sea region. This tendency of satellite-based SIT products to underestimate mean SIT needs to be considered for investigations of sea ice volume transports. Validation of satellite SIT in the first-year-ice-dominated Laptev Sea will support algorithm development for more reliable SIT records in the Arctic.
Thomas Krumpen, Florent Birrien, Frank Kauker, Thomas Rackow, Luisa von Albedyll, Michael Angelopoulos, H. Jakob Belter, Vladimir Bessonov, Ellen Damm, Klaus Dethloff, Jari Haapala, Christian Haas, Carolynn Harris, Stefan Hendricks, Jens Hoelemann, Mario Hoppmann, Lars Kaleschke, Michael Karcher, Nikolai Kolabutin, Ruibo Lei, Josefine Lenz, Anne Morgenstern, Marcel Nicolaus, Uwe Nixdorf, Tomash Petrovsky, Benjamin Rabe, Lasse Rabenstein, Markus Rex, Robert Ricker, Jan Rohde, Egor Shimanchuk, Suman Singha, Vasily Smolyanitsky, Vladimir Sokolov, Tim Stanton, Anna Timofeeva, Michel Tsamados, and Daniel Watkins
The Cryosphere, 14, 2173–2187, https://doi.org/10.5194/tc-14-2173-2020, https://doi.org/10.5194/tc-14-2173-2020, 2020
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In October 2019 the research vessel Polarstern was moored to an ice floe in order to travel with it on the 1-year-long MOSAiC journey through the Arctic. Here we provide historical context of the floe's evolution and initial state for upcoming studies. We show that the ice encountered on site was exceptionally thin and was formed on the shallow Siberian shelf. The analyses presented provide the initial state for the analysis and interpretation of upcoming biogeochemical and ecological studies.
Maria Luisa Sánchez-Montes, Erin L. McClymont, Jeremy M. Lloyd, Juliane Müller, Ellen A. Cowan, and Coralie Zorzi
Clim. Past, 16, 299–313, https://doi.org/10.5194/cp-16-299-2020, https://doi.org/10.5194/cp-16-299-2020, 2020
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In this paper, we present new climate reconstructions in SW Alaska from recovered marine sediments in the Gulf of Alaska. We find that glaciers reached the Gulf of Alaska during a cooling climate 2.9 million years ago, and after that the Cordilleran Ice Sheet continued growing during a global drop in atmospheric CO2 levels. Cordilleran Ice Sheet growth could have been supported by an increase in heat supply to the SW Alaska and warm ocean evaporation–mountain precipitation mechanisms.
Juan Pablo Corella, Niccolo Maffezzoli, Carlos Alberto Cuevas, Paul Vallelonga, Andrea Spolaor, Giulio Cozzi, Juliane Müller, Bo Vinther, Carlo Barbante, Helle Astrid Kjær, Ross Edwards, and Alfonso Saiz-Lopez
Clim. Past, 15, 2019–2030, https://doi.org/10.5194/cp-15-2019-2019, https://doi.org/10.5194/cp-15-2019-2019, 2019
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This study provides the first reconstruction of atmospheric iodine levels in the Arctic during the last 11 700 years from an ice core record in coastal Greenland. Dramatic shifts in iodine level variability coincide with abrupt climatic transitions in the North Atlantic. Since atmospheric iodine levels have significant environmental and climatic implications, this study may serve as a past analog to predict future changes in Arctic climate in response to global warming.
Thomas Opel, Julian B. Murton, Sebastian Wetterich, Hanno Meyer, Kseniia Ashastina, Frank Günther, Hendrik Grotheer, Gesine Mollenhauer, Petr P. Danilov, Vasily Boeskorov, Grigoriy N. Savvinov, and Lutz Schirrmeister
Clim. Past, 15, 1443–1461, https://doi.org/10.5194/cp-15-1443-2019, https://doi.org/10.5194/cp-15-1443-2019, 2019
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To reconstruct past winter climate, we studied ice wedges at two sites in the Yana Highlands, interior Yakutia (Russia), the most continental region of the Northern Hemisphere. Our ice wedges of the upper ice complex unit of the Batagay megaslump and a river terrace show much more depleted stable-isotope compositions than other study sites in coastal and central Yakutia, reflecting lower winter temperatures and a higher continentality of the study region during Marine Isotope Stages 3 and 1.
Valentin Ludwig, Gunnar Spreen, Christian Haas, Larysa Istomina, Frank Kauker, and Dmitrii Murashkin
The Cryosphere, 13, 2051–2073, https://doi.org/10.5194/tc-13-2051-2019, https://doi.org/10.5194/tc-13-2051-2019, 2019
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Sea-ice concentration, the fraction of an area covered by sea ice, can be observed from satellites with different methods. We combine two methods to obtain a product which is better than either of the input measurements alone. The benefit of our product is demonstrated by observing the formation of an open water area which can now be observed with more detail. Additionally, we find that the open water area formed because the sea ice drifted in the opposite direction and faster than usual.
Stefanie Arndt and Christian Haas
The Cryosphere, 13, 1943–1958, https://doi.org/10.5194/tc-13-1943-2019, https://doi.org/10.5194/tc-13-1943-2019, 2019
Charlotte Miller, Jemma Finch, Trevor Hill, Francien Peterse, Marc Humphries, Matthias Zabel, and Enno Schefuß
Clim. Past, 15, 1153–1170, https://doi.org/10.5194/cp-15-1153-2019, https://doi.org/10.5194/cp-15-1153-2019, 2019
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Here we reconstruct vegetation and precipitation, in eastern South Africa, over the last 32 000 years, by measuring the stable carbon and hydrogen isotope composition of plant waxes from Mfabeni peat bog (KwaZulu-Natal). Our results indicate that the late Quaternary climate in eastern South Africa did not respond directly to orbital forcing or to changes in sea-surface temperatures. Our findings stress the influence of the Southern Hemisphere westerlies in driving climate change in the region.
Eunmi Park, Jens Hefter, Gerhard Fischer, Morten Hvitfeldt Iversen, Simon Ramondenc, Eva-Maria Nöthig, and Gesine Mollenhauer
Biogeosciences, 16, 2247–2268, https://doi.org/10.5194/bg-16-2247-2019, https://doi.org/10.5194/bg-16-2247-2019, 2019
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We analyzed GDGT-based proxy temperatures in the polar oceans. In the eastern Fram Strait (79° N), the nutrient distribution may determine the depth habit of Thaumarchaeota and thus the proxy temperature. In the Antarctic Polar Front (50° S), the contribution of Euryarchaeota or the nonlinear correlation between the proxy values and temperatures may cause the warm biases of the proxy temperatures relative to SSTs.
Iina Ronkainen, Jonni Lehtiranta, Mikko Lensu, Eero Rinne, Jari Haapala, and Christian Haas
The Cryosphere, 12, 3459–3476, https://doi.org/10.5194/tc-12-3459-2018, https://doi.org/10.5194/tc-12-3459-2018, 2018
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We quantify the sea ice thickness variability in the Bay of Bothnia using various observational data sets. For the first time we use helicopter and shipborne electromagnetic soundings to study changes in drift ice of the Bay of Bothnia. Our results show that the interannual variability of ice thickness is larger in the drift ice zone than in the fast ice zone. Furthermore, the mean thickness of heavily ridged ice near the coast can be several times larger than that of fast ice.
Julie Lattaud, Frédérique Kirkels, Francien Peterse, Chantal V. Freymond, Timothy I. Eglinton, Jens Hefter, Gesine Mollenhauer, Sergio Balzano, Laura Villanueva, Marcel T. J. van der Meer, Ellen C. Hopmans, Jaap S. Sinninghe Damsté, and Stefan Schouten
Biogeosciences, 15, 4147–4161, https://doi.org/10.5194/bg-15-4147-2018, https://doi.org/10.5194/bg-15-4147-2018, 2018
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Long-chain diols (LCDs) are biomarkers that occur widespread in marine environments and also in lakes and rivers. In this study, we looked at the distribution of LCDs in three river systems (Godavari, Danube, and Rhine) in relation to season, precipitation, and temperature. We found out that the LCDs are likely being produced in calm areas of the river systems and that marine LCDs have a different distribution than riverine LCDs.
Paul J. Kushner, Lawrence R. Mudryk, William Merryfield, Jaison T. Ambadan, Aaron Berg, Adéline Bichet, Ross Brown, Chris Derksen, Stephen J. Déry, Arlan Dirkson, Greg Flato, Christopher G. Fletcher, John C. Fyfe, Nathan Gillett, Christian Haas, Stephen Howell, Frédéric Laliberté, Kelly McCusker, Michael Sigmond, Reinel Sospedra-Alfonso, Neil F. Tandon, Chad Thackeray, Bruno Tremblay, and Francis W. Zwiers
The Cryosphere, 12, 1137–1156, https://doi.org/10.5194/tc-12-1137-2018, https://doi.org/10.5194/tc-12-1137-2018, 2018
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Here, the Canadian research network CanSISE uses state-of-the-art observations of snow and sea ice to assess how Canada's climate model and climate prediction systems capture variability in snow, sea ice, and related climate parameters. We find that the system performs well, accounting for observational uncertainty (especially for snow), model uncertainty, and chaotic climate variability. Even for variables like sea ice, where improvement is needed, useful prediction tools can be developed.
Rony R. Kuechler, Lydie M. Dupont, and Enno Schefuß
Clim. Past, 14, 73–84, https://doi.org/10.5194/cp-14-73-2018, https://doi.org/10.5194/cp-14-73-2018, 2018
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Measuring deuterium and stable carbon isotopes of higher plant wax extracted from marine sediments offshore of Mauritania, we recovered a record of hydrology and vegetation change in West Africa for two Pliocene intervals: 5.0–4.6 and 3.6–3.0 Ma. We find that changes in local summer insolation cannot fully explain the variations in the West African monsoon and that latitudinal insolation and temperature gradients are important drivers of tropical monsoon systems.
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
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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.
Robert Ricker, Stefan Hendricks, Lars Kaleschke, Xiangshan Tian-Kunze, Jennifer King, and Christian Haas
The Cryosphere, 11, 1607–1623, https://doi.org/10.5194/tc-11-1607-2017, https://doi.org/10.5194/tc-11-1607-2017, 2017
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We developed the first merging of CryoSat-2 and SMOS sea-ice thickness retrievals. ESA’s Earth Explorer SMOS satellite can detect thin sea ice, whereas its companion CryoSat-2, designed to observe thicker perennial sea ice, lacks sensitivity. Using these satellite missions together completes the picture of the changing Arctic sea ice and provides a more accurate and comprehensive view on the actual state of Arctic sea-ice thickness.
Annette Hahn, Enno Schefuß, Sergio Andò, Hayley C. Cawthra, Peter Frenzel, Martin Kugel, Stephanie Meschner, Gesine Mollenhauer, and Matthias Zabel
Clim. Past, 13, 649–665, https://doi.org/10.5194/cp-13-649-2017, https://doi.org/10.5194/cp-13-649-2017, 2017
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Our study demonstrates that a source to sink analysis in the Gouritz catchment can be used to obtain valuable paleoclimatic information form the year-round rainfall zone. In combination with SST reconstructions these data are a valuable contribution to the discussion of Southern Hemisphere palaeoenvironments and climate variability (in particular atmosphere–ocean circulation and hydroclimate change) in the South African Holocene.
Shuwen Sun, Enno Schefuß, Stefan Mulitza, Cristiano M. Chiessi, André O. Sawakuchi, Matthias Zabel, Paul A. Baker, Jens Hefter, and Gesine Mollenhauer
Biogeosciences, 14, 2495–2512, https://doi.org/10.5194/bg-14-2495-2017, https://doi.org/10.5194/bg-14-2495-2017, 2017
Vera D. Meyer, Jens Hefter, Gerrit Lohmann, Lars Max, Ralf Tiedemann, and Gesine Mollenhauer
Clim. Past, 13, 359–377, https://doi.org/10.5194/cp-13-359-2017, https://doi.org/10.5194/cp-13-359-2017, 2017
Gerhard Fischer, Johannes Karstensen, Oscar Romero, Karl-Heinz Baumann, Barbara Donner, Jens Hefter, Gesine Mollenhauer, Morten Iversen, Björn Fiedler, Ivanice Monteiro, and Arne Körtzinger
Biogeosciences, 13, 3203–3223, https://doi.org/10.5194/bg-13-3203-2016, https://doi.org/10.5194/bg-13-3203-2016, 2016
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Particle fluxes at the Cape Verde Ocean Observatory in the eastern tropical North Atlantic for the period December 2009 until May 2011 are discussed based on deep sediment trap time-series data collected at 1290 and 3439 m water depths. The typically open-ocean flux pattern with weak seasonality is modified by the appearance of a highly productive and low oxygen eddy in winter 2010. The eddy passage was accompanied by high biogenic and lithogenic fluxes, lasting from December 2009 to May 2010.
T. Krumpen, R. Gerdes, C. Haas, S. Hendricks, A. Herber, V. Selyuzhenok, L. Smedsrud, and G. Spreen
The Cryosphere, 10, 523–534, https://doi.org/10.5194/tc-10-523-2016, https://doi.org/10.5194/tc-10-523-2016, 2016
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We present an extensive data set of ground-based and airborne electromagnetic ice thickness measurements covering Fram Strait in summer between 2001 and 2012. An investigation of back trajectories of surveyed sea ice using satellite-based sea ice motion data allows us to examine the connection between thickness variability, ice age and source area. In addition, we determine across and along strait gradients in ice thickness and associated volume fluxes.
C. Häggi, C. M. Chiessi, and E. Schefuß
Biogeosciences, 12, 7239–7249, https://doi.org/10.5194/bg-12-7239-2015, https://doi.org/10.5194/bg-12-7239-2015, 2015
C. M. Chiessi, S. Mulitza, G. Mollenhauer, J. B. Silva, J. Groeneveld, and M. Prange
Clim. Past, 11, 915–929, https://doi.org/10.5194/cp-11-915-2015, https://doi.org/10.5194/cp-11-915-2015, 2015
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Here we show that temperatures in the western South Atlantic increased markedly during the major slowdown event of the Atlantic meridional overturning circulation (AMOC) of the last deglaciation. Over the adjacent continent, however, temperatures followed the rise in atmospheric carbon dioxide, lagging changes in oceanic temperature. Our records corroborate the notion that the long duration of the major slowdown event of the AMOC was fundamental in driving the Earth out of the last glacial.
M. Winterfeld, T. Laepple, and G. Mollenhauer
Biogeosciences, 12, 3769–3788, https://doi.org/10.5194/bg-12-3769-2015, https://doi.org/10.5194/bg-12-3769-2015, 2015
M. Winterfeld, M. A. Goñi, J. Just, J. Hefter, and G. Mollenhauer
Biogeosciences, 12, 2261–2283, https://doi.org/10.5194/bg-12-2261-2015, https://doi.org/10.5194/bg-12-2261-2015, 2015
H. Kuehn, L. Lembke-Jene, R. Gersonde, O. Esper, F. Lamy, H. Arz, G. Kuhn, and R. Tiedemann
Clim. Past, 10, 2215–2236, https://doi.org/10.5194/cp-10-2215-2014, https://doi.org/10.5194/cp-10-2215-2014, 2014
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Annually laminated sediments from the NE Bering Sea reveal a decadal-scale correlation to Greenland ice core records during termination I, suggesting an atmospheric teleconnection. Lamination occurrence is tightly coupled to Bølling-Allerød and Preboreal warm phases. Increases in export production, closely coupled to SST and sea ice changes, are hypothesized to be a main cause of deglacial anoxia, rather than changes in overturning/ventilation rates of mid-depth waters entering the Bering Sea.
D. Price, W. Rack, P. J. Langhorne, C. Haas, G. Leonard, and K. Barnsdale
The Cryosphere, 8, 1031–1039, https://doi.org/10.5194/tc-8-1031-2014, https://doi.org/10.5194/tc-8-1031-2014, 2014
S. Willmes, M. Nicolaus, and C. Haas
The Cryosphere, 8, 891–904, https://doi.org/10.5194/tc-8-891-2014, https://doi.org/10.5194/tc-8-891-2014, 2014
L. Rabenstein, T. Krumpen, S. Hendricks, C. Koeberle, C. Haas, and J. A. Hoelemann
The Cryosphere, 7, 947–959, https://doi.org/10.5194/tc-7-947-2013, https://doi.org/10.5194/tc-7-947-2013, 2013
Related subject area
Paleobiogeoscience: Organic Biomarkers
Locally Produced Sedimentary Biomarkers in High-Altitude Catchments Outweigh Upstream River Transport in Sedimentary Archives
Comparison of paleobotanical and biomarker records of mountain peatland and forest ecosystem dynamics over the last 2600 years in central Germany
Hyperspectral imaging sediment core scanning tracks high-resolution Holocene variations in (an)oxygenic phototrophic communities at Lake Cadagno, Swiss Alps
A Holocene temperature (brGDGT) record from Garba Guracha, a high-altitude lake in Ethiopia
Human and livestock faecal biomarkers at the prehistorical encampment site of Ullafelsen in the Fotsch Valley, Stubai Alps, Austria – potential and limitations
The influence of lateral transport on sedimentary alkenone paleoproxy signals
Exploring the use of compound-specific carbon isotopes as a palaeoproductivity proxy off the coast of Adélie Land, East Antarctica
Development of global temperature and pH calibrations based on bacterial 3-hydroxy fatty acids in soils
Lignin oxidation products in soil, dripwater and speleothems from four different sites in New Zealand
From leaf to soil: n-alkane signal preservation, despite degradation along an environmental gradient in the tropical Andes
Comparison of the U37K′, LDI, TEX86H, and RI-OH temperature proxies in sediments from the northern shelf of the South China Sea
Reconstructing N2-fixing cyanobacterial blooms in the Baltic Sea beyond observations using 6- and 7-methylheptadecane in sediments as specific biomarkers
Organic signatures in Pleistocene cherts from Lake Magadi (Kenya) – implications for early Earth hydrothermal deposits
Biomarker evidence for the occurrence of anaerobic ammonium oxidation in the eastern Mediterranean Sea during Quaternary and Pliocene sapropel formation
Quantification of lignin oxidation products as vegetation biomarkers in speleothems and cave drip water
Ideas and perspectives: hydrothermally driven redistribution and sequestration of early Archaean biomass – the “hydrothermal pump hypothesis”
Ubiquitous production of branched glycerol dialkyl glycerol tetraethers (brGDGTs) in global marine environments: a new source indicator for brGDGTs
Diploptene δ13C values from contemporary thermokarst lake sediments show complex spatial variation
Improved end-member characterisation of modern organic matter pools in the Ohrid Basin (Albania, Macedonia) and evaluation of new palaeoenvironmental proxies
Assessing the potential of amino acid 13C patterns as a carbon source tracer in marine sediments: effects of algal growth conditions and sedimentary diagenesis
Distribution of branched glycerol dialkyl glycerol tetraethers in surface soils of the Qinghai–Tibetan Plateau: implications of brGDGTs-based proxies in cold and dry regions
Biostratigraphic evidence for dramatic Holocene uplift of Robinson Crusoe Island, Juan Fernández Ridge, SE Pacific Ocean
A laboratory experiment on the behaviour of soil-derived core and intact polar GDGTs in aquatic environments
Transport of branched tetraether lipids from the Tagus River basin to the coastal ocean of the Portuguese margin: consequences for the interpretation of the MBT'/CBT paleothermometer
Bacteriohopanepolyols record stratification, nitrogen fixation and other biogeochemical perturbations in Holocene sediments of the central Baltic Sea
Determination of the molecular signature of fossil conifers by experimental palaeochemotaxonomy – Part 1: The Araucariaceae family
Imbalanced nutrients as triggers for black shale formation in a shallow shelf setting during the OAE 2 (Wunstorf, Germany)
Occurrence and distribution of ladderane oxidation products in different oceanic regimes
Growth phase dependent hydrogen isotopic fractionation in alkenone-producing haptophytes
Alex Brittingham, Michael T. Hren, Sam Spitzschuch, Phil Glauberman, Yonaton Goldsmith, Boris Gasparyan, and Ariel Malinsky-Buller
EGUsphere, https://doi.org/10.5194/egusphere-2024-724, https://doi.org/10.5194/egusphere-2024-724, 2024
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Plant molecules, also called biomarkers, are a tool used for reconstructing climates in the past. In this study, we collected soils and stream sediments in a river catchment in Armenia in order to determine how these molecules move before deposition. We found that trees and grasses produce distinct biomarkers but these are not incorporated equally into stream sediments. Instead, biomarkers from deciduous trees overprint any upstream transport of grass biomarkers.
Carrie L. Thomas, Boris Jansen, Sambor Czerwiński, Mariusz Gałka, Klaus-Holger Knorr, E. Emiel van Loon, Markus Egli, and Guido L. B. Wiesenberg
Biogeosciences, 20, 4893–4914, https://doi.org/10.5194/bg-20-4893-2023, https://doi.org/10.5194/bg-20-4893-2023, 2023
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Peatlands are vital terrestrial ecosystems that can serve as archives, preserving records of past vegetation and climate. We reconstructed the vegetation history over the last 2600 years of the Beerberg peatland and surrounding area in the Thuringian Forest in Germany using multiple analyses. We found that, although the forest composition transitioned and human influence increased, the peatland remained relatively stable until more recent times, when drainage and dust deposition had an impact.
Paul D. Zander, Stefanie B. Wirth, Adrian Gilli, Sandro Peduzzi, and Martin Grosjean
Biogeosciences, 20, 2221–2235, https://doi.org/10.5194/bg-20-2221-2023, https://doi.org/10.5194/bg-20-2221-2023, 2023
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This study shows, for the first time, that hyperspectral imaging can detect bacteriochlorophyll pigments produced by green sulfur bacteria in sediment cores. We tested our method on cores from Lake Cadagno, Switzerland, and were able to reconstruct high-resolution variations in the abundance of green and purple sulfur bacteria over the past 12 700 years. Climate conditions, flood events, and land use had major impacts on the lake’s biogeochemical conditions over short and long timescales.
Lucas Bittner, Cindy De Jonge, Graciela Gil-Romera, Henry F. Lamb, James M. Russell, and Michael Zech
Biogeosciences, 19, 5357–5374, https://doi.org/10.5194/bg-19-5357-2022, https://doi.org/10.5194/bg-19-5357-2022, 2022
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With regard to global warming, an understanding of past temperature changes is becoming increasingly important. Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are membrane lipids used globally to reconstruct lake water temperatures. In the Bale Mountains lakes, we find a unique composition of brGDGT isomers. We present a modified local calibration and a new high-altitude temperature reconstruction from the Horn of Africa spanning the last 12.5 kyr.
Marcel Lerch, Tobias Bromm, Clemens Geitner, Jean Nicolas Haas, Dieter Schäfer, Bruno Glaser, and Michael Zech
Biogeosciences, 19, 1135–1150, https://doi.org/10.5194/bg-19-1135-2022, https://doi.org/10.5194/bg-19-1135-2022, 2022
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Faecal biomarker analyses present a useful tool in geoarcheological research. For a better understanding of the lives of our ancestors in alpine regions, we investigated modern livestock faeces and Holocene soils at the prehistorical encampment site of Ullafelsen in the Fotsch Valley, Stubai Alps, Austria. Initial results show a high input of livestock faeces and a negligible input of human faeces for this archeological site. Future studies will focus on mire archives in the Fotsch Valley.
Blanca Ausín, Negar Haghipour, Elena Bruni, and Timothy Eglinton
Biogeosciences, 19, 613–627, https://doi.org/10.5194/bg-19-613-2022, https://doi.org/10.5194/bg-19-613-2022, 2022
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The preservation and distribution of alkenones – organic molecules produced by marine algae – in marine sediments allows us to reconstruct past variations in sea surface temperature, primary productivity and CO2. Here, we explore the impact of remobilization and lateral transport of sedimentary alkenones on their fate in marine sediments. We demonstrate the pervasive influence of these processes on alkenone-derived environmental signals, compromising the reliability of related paleorecords.
Kate E. Ashley, Xavier Crosta, Johan Etourneau, Philippine Campagne, Harry Gilchrist, Uthmaan Ibraheem, Sarah E. Greene, Sabine Schmidt, Yvette Eley, Guillaume Massé, and James Bendle
Biogeosciences, 18, 5555–5571, https://doi.org/10.5194/bg-18-5555-2021, https://doi.org/10.5194/bg-18-5555-2021, 2021
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We explore the potential for the use of carbon isotopes of algal fatty acid as a new proxy for past primary productivity in Antarctic coastal zones. Coastal polynyas are hotspots of primary productivity and are known to draw down CO2 from the atmosphere. Reconstructions of past productivity changes could provide a baseline for the role of these areas as sinks for atmospheric CO2.
Pierre Véquaud, Sylvie Derenne, Alexandre Thibault, Christelle Anquetil, Giuliano Bonanomi, Sylvie Collin, Sergio Contreras, Andrew T. Nottingham, Pierre Sabatier, Norma Salinas, Wesley P. Scott, Josef P. Werne, and Arnaud Huguet
Biogeosciences, 18, 3937–3959, https://doi.org/10.5194/bg-18-3937-2021, https://doi.org/10.5194/bg-18-3937-2021, 2021
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A better understanding of past climate variations is essential to apprehend future climatic changes. The aim of this study is to investigate the applicability of specific organic compounds of bacterial origin, 3-hydroxy fatty acids (3-OH FAs), as temperature and pH proxies at the global level using an extended soil dataset. We show the major potential of 3-OH FAs as such proxies in terrestrial environments through the different models presented and their application for palaeoreconstruction.
Inken Heidke, Adam Hartland, Denis Scholz, Andrew Pearson, John Hellstrom, Sebastian F. M. Breitenbach, and Thorsten Hoffmann
Biogeosciences, 18, 2289–2300, https://doi.org/10.5194/bg-18-2289-2021, https://doi.org/10.5194/bg-18-2289-2021, 2021
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We analyzed lignin oxidation products (LOPs) in leaf litter and different soil horizons as well as dripwater and flowstone samples from four different cave sites from different vegetation zones in New Zealand using liquid chromatography coupled to mass spectrometry. We test whether the original source-dependent LOP signal of the overlying vegetation is preserved and can be recovered from flowstone samples and investigate how the signal is altered by the transport from the soil to the cave.
Milan L. Teunissen van Manen, Boris Jansen, Francisco Cuesta, Susana León-Yánez, and William D. Gosling
Biogeosciences, 17, 5465–5487, https://doi.org/10.5194/bg-17-5465-2020, https://doi.org/10.5194/bg-17-5465-2020, 2020
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We measured plant wax in leaves and soils along an environmental gradient in the Ecuadorian Andes. These data show how the wax composition changes as the plant material degrades in different environments. Local temperature is reflected in the wax despite the level degradation. The study results warrant further research into a possible causal relationship that may lead to the development of n-alkane patterns as a novel palaeoecological proxy.
Bingbing Wei, Guodong Jia, Jens Hefter, Manyu Kang, Eunmi Park, Shizhu Wang, and Gesine Mollenhauer
Biogeosciences, 17, 4489–4508, https://doi.org/10.5194/bg-17-4489-2020, https://doi.org/10.5194/bg-17-4489-2020, 2020
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This research reports the applicability of four organic temperature proxies (U37K', LDI, TEX86H, and RI-OH) to the northern South China Sea shelf. The comparison with local sea surface temperature (SST) indicates the impact of terrestrial input on LDI, TEX86H, and RI-OH proxies near the coast. After excluding samples influenced by terrestrial materials, proxy temperatures exhibit different seasonality, providing valuable tools to reconstruct regional SSTs under different monsoonal conditions.
Jérôme Kaiser, Norbert Wasmund, Mati Kahru, Anna K. Wittenborn, Regina Hansen, Katharina Häusler, Matthias Moros, Detlef Schulz-Bull, and Helge W. Arz
Biogeosciences, 17, 2579–2591, https://doi.org/10.5194/bg-17-2579-2020, https://doi.org/10.5194/bg-17-2579-2020, 2020
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Cyanobacterial blooms represent a threat to the Baltic Sea ecosystem, causing deoxygenation of the bottom water. In order to understand the natural versus anthropogenic factors driving these blooms, it is necessary to study long-term trends beyond observations. We have produced a record of cyanobacterial blooms since 1860 using organic molecules (biomarkers) preserved in sediments. Cyanobacterial blooms in the Baltic Sea are likely mainly related to temperature variability.
Manuel Reinhardt, Walter Goetz, Jan-Peter Duda, Christine Heim, Joachim Reitner, and Volker Thiel
Biogeosciences, 16, 2443–2465, https://doi.org/10.5194/bg-16-2443-2019, https://doi.org/10.5194/bg-16-2443-2019, 2019
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Organic matter in Archean hydrothermal cherts may contain molecular traces of early life. Alteration processes during and after deposition, however, may have obliterated potential biosignatures. Our results from modern analog samples (Pleistocene cherts from Lake Magadi, Kenya) show that biomolecules can survive early hydrothermal destruction in the macromolecular fraction of the organic matter. A conservation of molecular biosignatures in Archean hydrothermal cherts therefore seems possible.
Darci Rush, Helen M. Talbot, Marcel T. J. van der Meer, Ellen C. Hopmans, Ben Douglas, and Jaap S. Sinninghe Damsté
Biogeosciences, 16, 2467–2479, https://doi.org/10.5194/bg-16-2467-2019, https://doi.org/10.5194/bg-16-2467-2019, 2019
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Sapropels are layers of sediment that regularly occur in the Mediterranean. They indicate periods when the Mediterranean Sea water contained no oxygen, a gas vital for most large organisms. This research investigated a key process in the nitrogen cycle (anaerobic ammonium oxidation, anammox), which removes nitrogen – an important nutrient to algae – from the water, during sapropel events. Using lipids to trace this process, we found that anammox was active during the no-oxygen times.
Inken Heidke, Denis Scholz, and Thorsten Hoffmann
Biogeosciences, 15, 5831–5845, https://doi.org/10.5194/bg-15-5831-2018, https://doi.org/10.5194/bg-15-5831-2018, 2018
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We developed a sensitive method to analyze the lignin composition of organic traces contained in speleothems. Lignin is a main constituent of woody plants and its composition contains information about the type of vegetation. This method offers new possibilities to reconstruct the vegetation of past millennia since it combines the advantages of lignin analysis as a highly specific vegetation biomarker with the benefits of speleothems as unique terrestrial climate archives.
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
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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.
Wenjie Xiao, Yinghui Wang, Shangzhe Zhou, Limin Hu, Huan Yang, and Yunping Xu
Biogeosciences, 13, 5883–5894, https://doi.org/10.5194/bg-13-5883-2016, https://doi.org/10.5194/bg-13-5883-2016, 2016
Kimberley L. Davies, Richard D. Pancost, Mary E. Edwards, Katey M. Walter Anthony, Peter G. Langdon, and Lidia Chaves Torres
Biogeosciences, 13, 2611–2621, https://doi.org/10.5194/bg-13-2611-2016, https://doi.org/10.5194/bg-13-2611-2016, 2016
J. Holtvoeth, D. Rushworth, H. Copsey, A. Imeri, M. Cara, H. Vogel, T. Wagner, and G. A. Wolff
Biogeosciences, 13, 795–816, https://doi.org/10.5194/bg-13-795-2016, https://doi.org/10.5194/bg-13-795-2016, 2016
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Lake Ohrid is situated in the southern Balkans between Albania and Macedonia. It is a unique ecosystem with remarkable biodiversity and a sediment record of past climates that goes back more than a million years. Detailed reconstructions of past climate development and human alteration of the environment require underpinned and so in this study we go the present-day lake vegetation and catchment soils and test new proxies over one of the known recent cooling events of the region 8200 years ago.
T. Larsen, L. T. Bach, R. Salvatteci, Y. V. Wang, N. Andersen, M. Ventura, and M. D. McCarthy
Biogeosciences, 12, 4979–4992, https://doi.org/10.5194/bg-12-4979-2015, https://doi.org/10.5194/bg-12-4979-2015, 2015
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A tiny fraction of marine algae escapes decomposition and is buried in sediments. Since tools are needed to track the fate of algal organic carbon, we tested whether naturally occurring isotope variability among amino acids from algae and bacteria can be used as source diagnostic fingerprints. We found that isotope fingerprints track algal amino acid sources with high fidelity across different growth conditions, and that the fingerprints can be used to quantify bacterial amino acids in sediment.
S. Ding, Y. Xu, Y. Wang, Y. He, J. Hou, L. Chen, and J.-S. He
Biogeosciences, 12, 3141–3151, https://doi.org/10.5194/bg-12-3141-2015, https://doi.org/10.5194/bg-12-3141-2015, 2015
P. Sepúlveda, J. P. Le Roux, L. E. Lara, G. Orozco, and V. Astudillo
Biogeosciences, 12, 1993–2001, https://doi.org/10.5194/bg-12-1993-2015, https://doi.org/10.5194/bg-12-1993-2015, 2015
F. Peterse, C. M. Moy, and T. I. Eglinton
Biogeosciences, 12, 933–943, https://doi.org/10.5194/bg-12-933-2015, https://doi.org/10.5194/bg-12-933-2015, 2015
C. Zell, J.-H. Kim, M. Balsinha, D. Dorhout, C. Fernandes, M. Baas, and J. S. Sinninghe Damsté
Biogeosciences, 11, 5637–5655, https://doi.org/10.5194/bg-11-5637-2014, https://doi.org/10.5194/bg-11-5637-2014, 2014
M. Blumenberg, C. Berndmeyer, M. Moros, M. Muschalla, O. Schmale, and V. Thiel
Biogeosciences, 10, 2725–2735, https://doi.org/10.5194/bg-10-2725-2013, https://doi.org/10.5194/bg-10-2725-2013, 2013
Y. Lu, Y. Hautevelle, and R. Michels
Biogeosciences, 10, 1943–1962, https://doi.org/10.5194/bg-10-1943-2013, https://doi.org/10.5194/bg-10-1943-2013, 2013
M. Blumenberg and F. Wiese
Biogeosciences, 9, 4139–4153, https://doi.org/10.5194/bg-9-4139-2012, https://doi.org/10.5194/bg-9-4139-2012, 2012
D. Rush, E. C. Hopmans, S. G. Wakeham, S. Schouten, and J. S. Sinninghe Damsté
Biogeosciences, 9, 2407–2418, https://doi.org/10.5194/bg-9-2407-2012, https://doi.org/10.5194/bg-9-2407-2012, 2012
M. D. Wolhowe, F. G. Prahl, I. Probert, and M. Maldonado
Biogeosciences, 6, 1681–1694, https://doi.org/10.5194/bg-6-1681-2009, https://doi.org/10.5194/bg-6-1681-2009, 2009
Cited articles
Armand, L. K. and Zielinski, U.: Diatom Species of the genus Rhizosolenia
from Southern Ocean sediments: distribution and taxonomic notes, Diatom
Res., 16, 259–294, https://doi.org/10.1080/0269249X.2001.9705520, 2001.
Armand, L. K., Crosta, X., Romero, O., and Pichon, J.-J.: The biogeography of
major diatom taxa in Southern Ocean sediments: 1. Sea ice related species,
Palaeogeogr. Palaeocl., 223, 93–126,
https://doi.org/10.1016/J.PALAEO.2005.02.015, 2005.
Arrigo, K. R., Worthen, D. L., Lizotte, M. P., Dixon, P. and Dieckmann, G.:
Primary Production in Antarctic Sea Ice, Science, 276, 394–397,
https://doi.org/10.1126/science.276.5311.394, 1997.
Barbara, L., Crosta, X., Schmidt, S., and Massé, G.: Diatoms and
biomarkers evidence for major changes in sea ice conditions prior the
instrumental period in Antarctic Peninsula, Quaternary Sci. Rev., 79, 99–110,
https://doi.org/10.1016/j.quascirev.2013.07.021, 2013.
Barbara, L., Crosta, X., Leventer, A., Schmidt, S., Etourneau, J., Domack,
E., and Massé, G.: Environmental responses of the Northeast Antarctic
Peninsula to the Holocene climate variability, Paleoceanography, 31,
131–147, https://doi.org/10.1002/2015PA002785, 2016.
Bárcena, M. A., Gersonde, R., Ledesma, S., Fabrés, J., Calafat, A.
M., Canals, M., Sierro, F. J., and Flores, J. A.: Record of Holocene glacial
oscillations in Bransfield Basin as revealed by siliceous microfossil
assemblages, Antarct. Sci., 10, 269–285, https://doi.org/10.1017/S0954102098000364,
1998.
Barnard, A., Wellner, J. S., and Anderson, J. B.: Late Holocene climate
change recorded in proxy records from a Bransfield Basin sediment core,
Antarctic Peninsula, Polar Res., 33, https://doi.org/10.3402/polar.v33.17236, 2014.
Belt, S. T.: Source-specific biomarkers as proxies for Arctic and Antarctic
sea ice, Org. Geochem., 125, 277–298, https://doi.org/10.1016/j.orggeochem.2018.10.002,
2018.
Belt, S. T.: What do IP25 and related biomarkers really reveal about sea ice
change?, Quaternary Sci. Rev., 204, 216–219,
https://doi.org/10.1016/j.quascirev.2018.11.025, 2019.
Belt, S. T. and Müller, J.: The Arctic sea ice biomarker IP 25?: a
review of current understanding , recommendations for future research and
applications in palaeo sea ice reconstructions, Quaternary Sci. Rev., 79, 9–25,
https://doi.org/10.1016/j.quascirev.2012.12.001, 2013.
Belt, S. T., Allard, W. G., Massé, G., Robert, J. M., and Rowland, S. J.:
Highly branched isoprenoids (HBIs): Identification of the most common and
abundant sedimentary isomers, Geochim. Cosmochim. Ac., 64, 3839–3851,
https://doi.org/10.1016/S0016-7037(00)00464-6, 2000.
Belt, S. T., Masse, G., Rowland, S. J., Poulin, M., Michel, C., and Leblanc,
B.: A novel chemical fossil of palaeo sea ice?: IP 25, Org. Geochem., 38,
16–27, https://doi.org/10.1016/j.orggeochem.2006.09.013, 2007.
Belt, S. T., Brown, T. A., Ringrose, A. E., Cabedo-Sanz, P., Mundy, C. J.,
Gosselin, M., and Poulin, M.: Quantitative measurement of the sea ice diatom
biomarker IP25 and sterols in Arctic sea ice and underlying sediments:
Further considerations for palaeo sea ice reconstruction, Org. Geochem., 62,
33–45, https://doi.org/10.1016/J.ORGGEOCHEM.2013.07.002, 2013.
Belt, S. T., Brown, T. A., Ampel, L., Cabedo-Sanz, P., Fahl, K., Kocis, J. J., Massé, G., Navarro-Rodriguez, A., Ruan, J., and Xu, Y.: An inter-laboratory investigation of the Arctic sea ice biomarker proxy IP25 in marine sediments: key outcomes and recommendations, Clim. Past, 10, 155–166, https://doi.org/10.5194/cp-10-155-2014, 2014.
Belt, S. T., Cabedo-Sanz, P., Smik, L., Navarro-Rodriguez, A., Berben, S. M.
P., Knies, J., and Husum, K.: Identification of paleo Arctic winter sea ice
limits and the marginal ice zone: Optimised biomarker-based reconstructions
of late Quaternary Arctic sea ice, Earth Planet. Sc. Lett., 431, 127–139,
https://doi.org/10.1016/j.epsl.2015.09.020, 2015.
Belt, S. T., Smik, L., Brown, T. A., Kim, J. H., Rowland, S. J., Allen, C.
S., Gal, J. K., Shin, K. H., Lee, J. I., and Taylor, K. W. R.: Source
identification and distribution reveals the potential of the geochemical
Antarctic sea ice proxy IPSO25, Nat. Commun., 7, 1–10,
https://doi.org/10.1038/ncomms12655, 2016.
Belt, S. T., Brown, T. A., Smik, L., Tatarek, A., Wiktor, J., Stowasser, G.,
Assmy, P., Allen, C. S., and Husum, K.: Identification of C25 highly branched
isoprenoid (HBI) alkenes in diatoms of the genus Rhizosolenia in polar and
sub-polar marine phytoplankton, Org. Geochem., 110, 65–72,
https://doi.org/10.1016/j.orggeochem.2017.05.007, 2017.
Belt, S. T., Brown, T. A., Smik, L., Assmy, P., and Mundy, C. J.: Sterol
identification in floating Arctic sea ice algal aggregates and the Antarctic
sea ice diatom Berkeleya adeliensis, Org. Geochem., 118, 1–3,
https://doi.org/10.1016/j.orggeochem.2018.01.008, 2018.
Berben, S. M. P., Husum, K., Cabedo-Sanz, P., and Belt, S. T.: Holocene sub-centennial evolution of Atlantic water inflow and sea ice distribution in the western Barents Sea, Clim. Past, 10, 181–198, https://doi.org/10.5194/cp-10-181-2014, 2014.
Brault, M. and Simoneit, B. R. T.: Steroid and triterpenoid distributions in
bransfield strait sediments: Hydrothermally-enhanced diagenetic
transformations, Org. Geochem., 13, 697–705,
https://doi.org/10.1016/0146-6380(88)90091-5, 1988.
Buffen, A., Leventer, A., Rubin, A., and Hutchins, T.: Diatom assemblages in
surface sediments of the northwestern Weddell Sea, Antarctic Peninsula, Mar.
Micropaleontol., 62, 7–30, https://doi.org/10.1016/J.MARMICRO.2006.07.002, 2007.
Burckle, L. H. and Cooke, D. W.: Late Pleistocene Eucampia antarctica
Abundance Stratigraphy in the Atlantic Sector of the Southern Ocean,
Micropaleontology, 29, 6–10, https://doi.org/10.2307/1485648, 1983.
Cabedo-Sanz, P., Belt, S. T., Knies, J., and Husum, K.: Identification of
contrasting seasonal sea ice conditions during the Younger Dryas, Quaternary Sci.
Rev., 79, 74–86, https://doi.org/10.1016/j.quascirev.2012.10.028, 2013.
Cárdenas, P., Lange, C. B., Vernet, M., Esper, O., Srain, B., Vorrath,
M.-E., Ehrhardt, S., Müller, J., Kuhn, G., Arz, H. W., Lembke-Jene, L.,
and Lamy, F.: Biogeochemical proxies and diatoms in surface sediments across
the Drake Passage reflect oceanic domains and frontal systems in the region,
Prog. Oceanogr., 174, 72–88, https://doi.org/10.1016/j.pocean.2018.10.004, 2018.
Cavalieri, D. J., Parkinson, C. L., Gloersen, P., and Zwally, H. J.: Sea Ice
Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS Passive Microwave
Data, Version 1, Boulder, Color., USA, https://doi.org/10.5067/8GQ8LZQVL0VL, 1996.
Collares, L. L., Mata, M. M., Kerr, R., Arigony-Neto, J., and Barbat, M. M.:
Iceberg drift and ocean circulation in the northwestern Weddell Sea,
Antarctica, Deep-Sea Res. Pt. II, 149,
10–24, https://doi.org/10.1016/j.dsr2.2018.02.014, 2018.
Collins, L. G., Allen, C. S., Pike, J., Hodgson, D. A., Weckström, K.,
and Massé, G.: Evaluating highly branched isoprenoid (HBI) biomarkers as
a novel Antarctic sea-ice proxy in deep ocean glacial age sediments, Quaternary
Sci. Rev., 79, 87–98, https://doi.org/10.1016/j.quascirev.2013.02.004, 2013.
Crosta, X., Pichon, J.-J., and Burckle, L. H.: Application of modern analog
technique to marine Antarctic diatoms: Reconstruction of maximum sea-ice
extent at the Last Glacial Maximum, Paleoceanography, 13, 284–297,
https://doi.org/10.1029/98PA00339, 1998.
De La Rocha, C. L. and Passow, U.: Factors influencing the sinking of POC and
the efficiency of the biological carbon pump, Deep-Sea Res. Pt. II, 54, 639–658, https://doi.org/10.1016/j.dsr2.2007.01.004, 2007.
Denis, D., Crosta, X., Barbara, L., Massé, G., Renssen, H., Ther, O., and
Giraudeau, J.: Sea ice and wind variability during the Holocene in East
Antarctica: insight on middle–high latitude coupling, Quaternary Sci. Rev.,
29, 3709–3719, https://doi.org/10.1016/J.QUASCIREV.2010.08.007, 2010.
Esper, O. and Gersonde, R.: New tools for the reconstruction of Pleistocene
Antarctic sea ice, Palaeogeogr. Palaeocl., 399, 260–283,
https://doi.org/10.1016/J.PALAEO.2014.01.019, 2014a.
Esper, O. and Gersonde, R.: Quaternary surface water temperature
estimations: New diatom transfer functions for the Southern Ocean,
Palaeogeogr. Palaeocl., 414, 1–19,
https://doi.org/10.1016/J.PALAEO.2014.08.008, 2014b.
Esper, O., Gersonde, R., and Kadagies, N.: Diatom distribution in
southeastern Pacific surface sediments and their relationship to modern
environmental variables, Palaeogeogr. Palaeocl.,
287, 1–27, https://doi.org/10.1016/J.PALAEO.2009.12.006, 2010.
Etourneau, J., Collins, L. G., Willmott, V., Kim, J.-H., Barbara, L., Leventer, A., Schouten, S., Sinninghe Damsté, J. S., Bianchini, A., Klein, V., Crosta, X., and Massé, G.: Holocene climate variations in the western Antarctic Peninsula: evidence for sea ice extent predominantly controlled by changes in insolation and ENSO variability, Clim. Past, 9, 1431–1446, https://doi.org/10.5194/cp-9-1431-2013, 2013.
Fahl, K. and Stein, R.: Modern seasonal variability and deglacial/Holocene
change of central Arctic Ocean sea-ice cover: New insights from biomarker
proxy records, Earth Planet. Sc. Lett., 351–352, 123–133,
https://doi.org/10.1016/j.epsl.2012.07.009, 2012.
Fryxell, G. A. and Prasad, A. K. S. K.: Eucampia antarctica var. recta
(Mangin) stat. nov. (Biddulphiaceae, Bacillariophyceae): life stages at the
Weddell Sea ice edge, Phycologia, 29, 27–38,
https://doi.org/10.2216/i0031-8884-29-1-27.1, 1990.
Fütterer, D. K.: Die Expedition ANTARKTIS-VI mit FS Polarstern 1987/1988
(The Expedition ANTARKTIS-VI of RV Polarstern in 1987/88),
Alfred-Wegener-Institut für Polar- und Meeresforschung, Bremerhaven,
Germany, 1988.
Gersonde, R. and Zielinski, U.: The reconstruction of late Quaternary
Antarctic sea-ice distribution — the use of diatoms as a proxy for
sea-ice, Palaeogeogr. Palaeocl., 162, 263–286,
https://doi.org/10.1016/S0031-0182(00)00131-0, 2000.
Gersonde, R., Crosta, X., Abelmann, A., and Armand, L.: Sea-surface
temperature and sea ice distribution of the Southern Ocean at the EPILOG
Last Glacial Maximum – a circum-Antarctic view based on siliceous
microfossil records, Quaternary Sci. Rev., 24, 869–896,
https://doi.org/10.1016/J.QUASCIREV.2004.07.015, 2005.
Gladu, P. K., Patterson, G. W., Wikfors, G. H., Chitwood, D. J., and Lusby,
W. R.: The occurrence of brassicasterol and epibrassicasterol in the
chromophycota, Comp. Biochem. Phys. B, 97,
491–494, https://doi.org/10.1016/0305-0491(90)90149-N, 1990.
Gloersen, P., Campbell, W. J., Cavalieri, D. J., Comiso, J. C., Parkinson,
C. L., and Zwally, H. J.: Arctic and antarctic sea ice, 1978, Ann. Glaciol.,
17, 149–154, 1993.
Goad, L. J., Holz, G. G., and Beach, D. H.: Identification of
(24S)-24-methylcholesta-5,22-dien-3β-ol as the major sterol of a
marine cryptophyte and a marine prymnesiophyte, Phytochemistry, 22,
475–476, https://doi.org/10.1016/0031-9422(83)83028-3, 1983.
Gonçalves-Araujo, R., de Souza, M. S., Tavano, V. M., and Garcia, C. A.
E.: Influence of oceanographic features on spatial and interannual
variability of phytoplankton in the Bransfield Strait, Antarctica, J. Mar.
Syst., 142, 1–15, https://doi.org/10.1016/J.JMARSYS.2014.09.007, 2015.
Gough, A. J., Mahoney, A. R., Langhorne, P. J., Williams, M. J. M.,
Robinson, N. J., and Haskell, T. G.: Signatures of supercooling: McMurdo
Sound platelet ice, J. Glaciol., 58, 38–50, https://doi.org/10.3189/2012jog10j218,
2012.
Hancke, K., Lund-Hansen, L. C., Lamare, M. L., Højlund Pedersen, S.,
King, M. D., Andersen, P., and Sorrell, B. K.: Extreme Low Light Requirement
for Algae Growth Underneath Sea Ice: A Case Study From Station Nord, NE
Greenland, J. Geophys. Res.-Ocean., 123, 985–1000,
https://doi.org/10.1002/2017JC013263, 2018.
Hasle, G. R. and Syvertsen, E. E.: Marine diatoms, in: Identifying Marine
Diatoms and Dinoflagellates, edited by: Tomas, C. R., 5–385, Academic
Press Limited, London, 1996.
Heroy, D. C., Sjunneskog, C., and Anderson, J. B.: Holocene climate change in
the Bransfield Basin, Antarctic Peninsula: evidence from sediment and diatom
analysis, Antarct. Sci., 20, 69–87, https://doi.org/10.1017/S0954102007000788,
2008.
Hobbs, W. R., Massom, R., Stammerjohn, S., Reid, P., Williams, G., and Meier,
W.: A review of recent changes in Southern Ocean sea ice, their drivers and
forcings, Global Planet. Change, 143, 228–250,
https://doi.org/10.1016/j.gloplacha.2016.06.008, 2016.
Hofmann, E. E., Klinck, J. M., Lascara, C. M., and Smith, D. A.: Water mass
distribution and circulation west of the Antarctic Peninsula and including
Bransfield Strait, in: Foundations for Ecological Research West of the
Antarctic Peninsula, edited by: Ross, R., Hofmann, E. E., and Quetin, L. B.,
61–80, American Geophysical Union (AGU), Washington, D.C., 1996.
Hoppmann, M., Nicolaus, M., Paul, S., Hunkeler, P. A., Heinemann, G.,
Willmes, S., Timmermann, R., Boebel, O., Schmidt, T., Kühnel, M.,
König-Langlo, G., and Gerdes, R.: Ice platelets below weddell sea
landfast sea ice, Ann. Glaciol., 56, 175–190,
https://doi.org/10.3189/2015AoG69A678, 2015.
Kanazawa, A., Yoshioka, M., and Teshima, S.-I.: The occurrence of
brassicasterol in the diatoms, Cyclotella nana and Nitzschia closterium,
Bull. Japanese Soc. Sci. Fish., 37, 889–903, 1971.
Kim, D., Kim, D. Y., Kim, Y. J., Kang, Y. C., and Shim, J.: Downward fluxes
of biogenic material in Bransfield Strait, Antarctica, Antarct. Sci., 16,
227–237, https://doi.org/10.1017/S0954102004002032, 2004.
Kim, D., Kim, D. Y., Park, J. S., and Kim, Y. J.: Interannual variation of
particle fluxes in the eastern Bransfield Strait, Antarctica: A response to
the sea ice distribution, Deep-Sea Res. Pt. I, 52,
2140–2155, https://doi.org/10.1016/j.dsr.2005.06.008, 2005.
Kim, Y. S. and Orsi, A. H.: On the Variability of Antarctic Circumpolar
Current Fronts Inferred from 1992–2011 Altimetry*, J. Phys. Oceanogr.,
44, 3054–3071, https://doi.org/10.1175/jpo-d-13-0217.1, 2014.
King, J.: A resolution of the Antarctic paradox, Nature, 505,
491–492, https://doi.org/10.1038/505491a, 2014.
King, J. C. and Harangozo, S. A.: Climate change in the western Antarctic
Peninsula since 1945: observations and possible causes, Ann. Glaciol., 27,
571–575, https://doi.org/10.3189/1998AoG27-1-571-575, 1998.
Klunder, M. B., Laan, P., De Baar, H. J. W., Middag, R., Neven, I., and Van Ooijen, J.: Dissolved Fe across the Weddell Sea and Drake Passage: impact of DFe on nutrient uptake, Biogeosciences, 11, 651–669, https://doi.org/10.5194/bg-11-651-2014, 2014.
Lamy, F.: The expedition PS97 of the research vessel POLARSTERN to the Drake
Passage in 2016, Reports Polar Mar. Res., 7'01, 1–571,
https://doi.org/10.2312/BzPM_0702_2016, 2016.
Leventer, A.: The fate of Antarctic “sea ice diatoms” and their use as
paleoenvironmental indicators, in: Antarctic Research Series, edited by:
Lizotte, M. P. and Arrigo, K. R., 121–137, American Geophysical Union (AGU),
1998.
Liu, J., Curry, J. A., and Martinson, D. G.: Interpretation of recent
Antarctic sea ice variability, Geophys. Res. Lett., 31, 2000–2003,
https://doi.org/10.1029/2003GL018732, 2004.
Massé, G., Belt, S. T., Crosta, X., Schmidt, S., Snape, I., Thomas, D.
N., and Rowland, S. J.: Highly branched isoprenoids as proxies for variable
sea ice conditions in the Southern Ocean, Antarct. Sci., 23, 487–498,
https://doi.org/10.1017/S0954102011000381, 2011.
Mendes, C. R. B., Tavano, V. M., Leal, M. C., de Souza, M. S., Brotas, V.,
and Garcia, C. A. E.: Shifts in the dominance between diatoms and
cryptophytes during three late summers in the Bransfield Strait (Antarctic
Peninsula), Polar Biol., 36, 537–547, https://doi.org/10.1007/s00300-012-1282-4,
2013.
Minzoni, R. T., Anderson, J. B., Fernandez, R., and Wellner, J. S.: Marine
record of Holocene climate, ocean, and cryosphere interactions: Herbert
Sound, James Ross Island, Antarctica, Quaternary Sci. Rev., 129, 239–259,
https://doi.org/10.1016/j.quascirev.2015.09.009, 2015.
Moffat, C. and Meredith, M.: Shelf-ocean exchange and hydrography west of
the Antarctic Peninsula: A review, Philos. T. R. Soc. A, 376, https://doi.org/10.1098/rsta.2017.0164, 2018.
Moore, J. K. and Abbott, M. R.: Surface chlorophyll concentrations in
relation to the Antarctic Polar Front: Seasonal and spatial patterns from
satellite observations, J. Marine Syst., 37, 69–86,
https://doi.org/10.1016/S0924-7963(02)00196-3, 2002.
Morrison, A. K., England, M. H., and Hogg, A. M.: Response of Southern Ocean
Convection and Abyssal Overturning to Surface Buoyancy Perturbations, J.
Climate, 28, 4263–4278, https://doi.org/10.1175/JCLI-D-14-00110.1, 2015.
Müller, J. and Stein, R.: High-resolution record of late glacial and
deglacial sea ice changes in Fram Strait corroborates ice–ocean
interactions during abrupt climate shifts, Earth Planet. Sc. Lett., 403,
446–455, https://doi.org/10.1016/j.epsl.2014.07.016, 2014.
Müller, J., Massé, G., Stein, R., and Belt, S. T.: Variability of
sea-ice conditions in the Fram Strait over the past 30,000 years, Nat.
Geosci., 2, 772–776, https://doi.org/10.1038/ngeo665, 2009.
Müller, J., Wagner, A., Fahl, K., Stein, R., Prange, M., and Lohmann, G.:
Towards quantitative sea ice reconstructions in the northern North Atlantic:
A combined biomarker and numerical modelling approach, Earth Planet. Sc.
Lett., 306, 137–148, https://doi.org/10.1016/J.EPSL.2011.04.011, 2011.
Müller, J., Werner, K., Stein, R., Fahl, K., Moros, M., and Jansen, E.:
Holocene cooling culminates in sea ice oscillations in Fram Strait, Quaternary
Sci. Rev., 47, 1–14, https://doi.org/10.1016/j.quascirev.2012.04.024, 2012.
Nichols, P. D., Volkman, J. K., Palmisano, A. C., Smith, G. A., and White, D.
C.: Occurrence of an Isoprenoid C25 diunsaturated alkene and high neutral
lipid content in Antarctic Sea-Ice Diatom communities, J. Phycol., 24,
90–96, 1988.
Ocean Data View: Ocean Data View 4.7.10, available at: https://odv.awi.de/, last access: February 2017.
Oksanen, J., Blanchet, F. G., Kindt, R., Legendre, P., Minchin, P. R.,
O'Hara, R. B., Simpson, G. L., Solymos, P., Stevens, M. H. H.,
and Wagner, H.: Vegan: Community Ecology Package (R Package Version 2.0-3), available at: https://cran.r-project.org/web/packages/vegan/index.html (last access: 30 July 2019),
2012.
Orsi, A. H., Whitworth, T., and Nowlin, W. D.: On the meridional extent and
fronts of the Antarctic Circumpolar Current, Deep-Sea Res. Pt. I, 42,
641–673, https://doi.org/10.1016/0967-0637(95)00021-W, 1995.
Orsi, A. H., Smethie, W. M., and Bullister, J. L.: On the total input of
Antarctic waters to the deep ocean: A preliminary estimate from
chlorofluorocarbon measurements, J. Geophys. Res., 107, 31-1–31-14,
https://doi.org/10.1029/2001JC000976, 2002.
Pachauri, R. K., Allen, M. R., Barros, V. R., Broome, J.,
Cramer, W.,
Christ, R.,
Church, J. A., Clarke, L., Dahe, Q. D.,
Dasqupta, P.,
Dubash, N. K.,
Edenhofer, O.,
Elgizouli, I.,
Field, C. B.,
Forster, P.,
Friedlingstein, P.,
Fuglestvedt, J.,
Gomez-Echeverri, L.,
Hallegatte, S.,
Hegerl, G.,
Howden, M.,
Jiang, K.,
Cisneros, B. J.,
Kattsov, V.,
Lee, H.,
Mach, K. J.,
Marotzke, J.,
Mastrandrea, M. D.,
Meyer, L., Minx, J.,
Mulugetta, Y., O'Brien, K.,
Oppenheimer, M.,
Pereira, J. J.,
Pichs-Madruga, R.,
Plattner, G.-K.,
Pörtner, H.-O.,
Power, S. B.,
Preston, B.,
Ravindranath, N. H.,
Reisinger, A.,
Riahi, K.,
Rusticucci, M.,
Scholes, R.,
Seyboth, K.,
Sokona, Y.,
Stavins, R.,
Stocker, T. F.,
Tschakert, P.,
van Vuuren, D., and
van Ypersele, J.-P.: Climate change 2014 synthesis report. Contribution of working groups I, II, and III to the fifth assessment report of the Intergovermental Panel of Climate Change, IPCC, 2014.
Parkinson, C. L.: Trends in the length of the Southern Ocean sea-ice season,
1979–99, Ann. Glaciol., 34, 435–440, https://doi.org/10.3189/172756402781817482,
2002.
Parkinson, C. L. and Cavalieri, D. J.: Antarctic sea ice variability and trends, 1979–2010, The Cryosphere, 6, 871–880, https://doi.org/10.5194/tc-6-871-2012, 2012.
Pike, J., Allen, C. S., Leventer, A., Stickley, C. E., and Pudsey, C. J.:
Comparison of contemporary and fossil diatom assemblages from the western
Antarctic Peninsula shelf, Mar. Micropaleontol., 67, 274–287,
https://doi.org/10.1016/J.MARMICRO.2008.02.001, 2008.
Ragueneau, O., Tréguer, P., Leynaert, A., Anderson, R., Brzezinski, M., DeMaster, D., Dugdale, R., Dymond, J., Fischer, G., François, R.,
Heinze, C., Maier-Reimer, E., Martin-Jézéquel, V., Nelson, D., and
Quéguiner, B.: A review of the Si cycle in the modern ocean: recent
progress and missing gaps in the application of biogenic opal as a
paleoproductivity proxy, Global Planet. Change, 26, 317–365,
https://doi.org/10.1016/S0921-8181(00)00052-7, 2000.
R Core Team: R: a Language and Environment for Statistical Computing, R
Foundation for Statistical computing, Vienna, 2012.
Reynolds, R. W., Rayner, N. A., Smith, T. M., Stokes, D. C., Wang, W.: An
Improved In Situ and Satellite SST Analysis for Climate, J. Climate, 15,
1609–1625, https://doi.org/10.1175/1520-0442(2002)015<1609:AIISAS>2.0.CO;2, 2002.
Reynolds, R. W., Smith, T. M., Liu, C., Chelton, D. B., Casey, K. S.,
Schlax, M. G., Reynolds, R. W., Smith, T. M., Liu, C., Chelton, D. B.,
Casey, K. S., and Schlax, M. G.: Daily High-Resolution-Blended Analyses for
Sea Surface Temperature, J. Climate, 20, 5473–5496,
https://doi.org/10.1175/2007JCLI1824.1, 2007.
Riaux-Gobin, C. and Poulin, M.: Possible symbiosis of Berkeleya adeliensis
Medlin, Synedropsis fragilis (Manguin) Hasle et al. and Nitzschia lecointei
Van Heurck (bacillariophyta) associated with land-fast ice in Adélie
Land, Antarctica, Diatom Res., 19, 265–274,
https://doi.org/10.1080/0269249X.2004.9705874, 2004.
Rintoul, S. R.: Rapid freshening of Antarctic Bottom Water formed in the
Indian and Pacific oceans, Geophys. Res. Lett., 34, L06606,
https://doi.org/10.1029/2006GL028550, 2007.
Rontani, J. F., Belt, S. T., Vaultier, F., and Brown, T. A.: Visible light
induced photo-oxidation of highly branched isoprenoid (HBI) alkenes:
Significant dependence on the number and nature of double bonds, Org.
Geochem., 42, 812–822, https://doi.org/10.1016/j.orggeochem.2011.04.013, 2011.
Rontani, J.-F., Charriere, B., Petit, M., Vaultier, F., Heipieper, H. J., Link, H., Chaillou, G., and Sempéré, R.: Degradation state of organic matter in surface sediments from the Southern Beaufort Sea: a lipid approach, Biogeosciences, 9, 3513–3530, https://doi.org/10.5194/bg-9-3513-2012, 2012.
Rontani, J.-F., Belt, S. T., Vaultier, F., Brown, T. A., and Massé, G.:
Autoxidative and Photooxidative Reactivity of Highly Branched Isoprenoid
(HBI) Alkenes, Lipids, 49, 481–494, https://doi.org/10.1007/s11745-014-3891-x, 2014.
Rontani, J. F., Belt, S. T., and Amiraux, R.: Biotic and abiotic degradation
of the sea ice diatom biomarker IP25 and selected algal sterols in
near-surface Arctic sediments, Org. Geochem., 118, 73–88,
https://doi.org/10.1016/j.orggeochem.2018.01.003, 2018.
Rontani, J., Smik, L. and Belt, S. T.: Autoxidation of the sea ice biomarker
proxy IPSO25 in the near-surface oxic layers of Arctic and Antarctic
sediments, Org. Geochem., 129, 63–76, https://doi.org/10.1016/J.ORGGEOCHEM.2019.02.002,
2019a.
Rontani, J. F., Smik, L., Belt, S. T., Vaultier, F., Armbrecht, L.,
Leventer, A., and Armand, L. K.: Abiotic degradation of highly branched
isoprenoid alkenes and other lipids in the water column off East Antarctica,
Mar. Chem., 210, 34–47, https://doi.org/10.1016/j.marchem.2019.02.004, 2019b.
Sangrà, P., Gordo, C., Hernández-Arencibia, M., Marrero-Díaz,
A., Rodríguez-Santana, A., Stegner, A., Martínez-Marrero, A.,
Pelegrí, J. L., and Pichon, T.: The Bransfield current system, Deep-Sea
Res. Pt. I, 58, 390–402,
https://doi.org/10.1016/J.DSR.2011.01.011, 2011.
Schmidt, K., Brown, T. A., Belt, S. T., Ireland, L. C., Taylor, K. W. R., Thorpe, S. E., Ward, P., and Atkinson, A.: Do pelagic grazers benefit from sea ice? Insights from the Antarctic sea ice proxy IPSO25, Biogeosciences, 15, 1987–2006, https://doi.org/10.5194/bg-15-1987-2018, 2018.
Schrader, H. and Gersonde, R.: Diatoms and silicoflagellates, in:
Micropaleontological Methods and Techniques – An Excercise on an Eight Meter
Section of the Lower Pliocene of Capo Rossello, Sicily, edited by: Zachariasse, W. J.,
Riedel, W. R., Sanfilippo, A., Schmidt, R. R., Brolsma, M. J., Schrader, H. J.,
Gersonde, R., Drooger, M. M., and Broekman, J. A., Utrecht
Micropaleontological Bulletins, Vol. 17, 129–176, 1978.
Simpson, G. L. and Oksanen, J.: Analogue: Analogue Matching and Modern
Analogue Technique Transfer Function Models, R Package Version 0.8-2, available at: https://cran.r-project.org/web/packages/analogue/index.html (last access: 30 July 2019), 2012.
Sinninghe Damsté, J. S., Muyzer, G., Abbas, B., Rampen, S. W.,
Massé, G., Allard, W. G., Belt, S. T., Robert, J. M., Rowland, S. J.,
Moldowan, J. M., Barbanti, S. M., Fago, F. J., Denisevich, P., Dahl, J.,
Trindade, L. A. F., and Schouten, S.: The Rise of the Rhizosolenid Diatoms,
Science, 304, 584–587, https://doi.org/10.1126/science.1096806, 2004.
Sinninghe Damsté, J. S., Rijpstra, W. I. C., Coolen, M. J. L., Schouten,
S., and Volkman, J. K.: Rapid sulfurisation of highly branched isoprenoid
(HBI) alkenes in sulfidic Holocene sediments from Ellis Fjord, Antarctica,
Org. Geochem., 38, 128–139, https://doi.org/10.1016/j.orggeochem.2006.08.003, 2007.
Smik, L., Belt, S. T., Lieser, J. L., Armand, L. K., and Leventer, A.:
Distributions of highly branched isoprenoid alkenes and other algal lipids
in surface waters from East Antarctica: Further insights for biomarker-based
paleo sea-ice reconstruction, Org. Geochem., 95, 71–80,
https://doi.org/10.1016/J.ORGGEOCHEM.2016.02.011, 2016a.
Smik, L., Cabedo-Sanz, P., and Belt, S. T.: Semi-quantitative estimates of
paleo Arctic sea ice concentration based on source-specific highly branched
isoprenoid alkenes: A further development of the PIP 25 index, Org.
Geochem., 92, 63–69, https://doi.org/10.1016/j.orggeochem.2015.12.007, 2016b.
Stein, R., Fahl, K., and Müller, J.: Proxy Reconstruction of Cenozoic
Arctic Ocean Sea-Ice History: from IRD to IP25, Polarforschung, 82,
37–71, 2012.
Stein, R., Fahl, K., Gierz, P., Niessen, F., and Lohmann, G.: Arctic Ocean
sea ice cover during the penultimate glacial and the last interglacial, Nat.
Commun., 8, 373, https://doi.org/10.1038/s41467-017-00552-1, 2017.
Stuiver, M., Reimer, P. J., and Reimer, R. W.: Calib 7.1, available
at: http://calib.org (last access: 7 November 2018), 2019.
Thompson, A. F., Heywood, K. J., Thorpe, S. E., Renner, A. H. H., and
Trasviña, A.: Surface Circulation at the Tip of the Antarctic Peninsula
from Drifters, J. Phys. Oceanogr., 39, 3–26, https://doi.org/10.1175/2008JPO3995.1,
2009.
Vaughan, D. G., Marshall, G. J., Connolley, W. M., Parkinson, C., Mulvaney,
R., Hodgson, D. A., King, J. C., Pudsey, C. J., and Turner, J.: Recent Rapid
Regional Climate Warming on the Antarctic Peninsula, Climatic Change, 60,
243–274, https://doi.org/10.1023/A:1026021217991, 2003.
Volkman, J. K.: A review of sterol markers for marine and terrigenous
organic matter, Org. Geochem., 9, 83–99,
https://doi.org/10.1016/0146-6380(86)90089-6, 1986.
Volkman, J. K.: Sterols in microorganisms, Appl. Microbiol. Biotechnol.,
60, 495–506, https://doi.org/10.1007/s00253-002-1172-8, 2003.
Vorrath, M.-E., Müller, J., Esper, O., Mollenhauer, G., Haas, C., Schefuß, E., and Fahl, K.: Highly branched isoprenoids, radiocarbon ages and diatom asmblages in surface sediments from Southern Ocean, PANGAEA, https://doi.org/10.1594/PANGAEA.897165, 2019.
Wacker, L., Bonani, G., Friedrich, M., Hajdas, I., Kromer, B., Němec,
M., Ruff, M., Suter, M., Synal, H.-A., and Vockenhuber, C.: MICADAS: Routine
and High-Precision Radiocarbon Dating, Radiocarbon, 52, 252–262,
https://doi.org/10.1017/S0033822200045288, 2010.
Wefer, G., Fischer, G., Füetterer, D., and Gersonde, R.: Seasonal
particle flux in the Bransfield Strait, Antartica, Deep-Sea Res. Pt. A, 35, 891–898, https://doi.org/10.1016/0198-0149(88)90066-0,
1988.
Wollenburg, J. E., Katlein, C., Nehrke, G., Nöthig, E.-M., Matthiessen,
J., Wolf-Gladrow, D. A., Nikolopoulos, A., Gázquez-Sanchez, F.,
Rossmann, L., Assmy, P., Babin, M., Bruyant, F., Beaulieu, M., Dybwad, C.,
and Peeken, I.: Ballasting by cryogenic gypsum enhances carbon export in a
Phaeocystis under-ice bloom, Sci. Rep.-UK, 8, 7703,
https://doi.org/10.1038/s41598-018-26016-0, 2018.
Xiao, X., Fahl, K., Müller, J., and Stein, R.: Sea-ice distribution in
the modern Arctic Ocean: Biomarker records from trans-Arctic Ocean surface
sediments, Geochim. Cosmochim. Ac., 155, 16–29,
https://doi.org/10.1016/J.GCA.2015.01.029, 2015.
Zielinski, U. and Gersonde, R.: Diatom distribution in Southern Ocean
surface sediments (Atlantic sector): Implications for paleoenvironmental
reconstructions, Palaeogeogr. Palaeocl., 129,
213–250, https://doi.org/10.1016/S0031-0182(96)00130-7, 1997.
Zielinski, U., Gersonde, R., Sieger, R., and Fütterer, D.: Quaternary
surface water temperature estimations: Calibration of a diatom transfer
function for the Southern Ocean, Paleoceanography, 13, 365–383,
https://doi.org/10.1029/98PA01320, 1998.
Zwally, H. J., Comiso, J. C., Parkinson, C. L., Cavalieri, D. J., and
Gloersen, P.: Variability of Antarctic sea ice 1979–1998, J. Geophys. Res.,
107, 3041, https://doi.org/10.1029/2000JC000733, 2002.
Short summary
The study highlights new approaches in the investigation of past sea ice in Antarctica to reconstruct the climate conditions in earth's history and reveal its future development under global warming. We examined the distribution of organic remains from different algae at the Western Antarctic Peninsula and compared it to fossil and satellite records. We evaluated IPSO25 – the sea ice proxy for the Southern Ocean with 25 carbon atoms – as a useful tool for sea ice reconstructions in this region.
The study highlights new approaches in the investigation of past sea ice in Antarctica to...
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