Articles | Volume 20, issue 7
https://doi.org/10.5194/bg-20-1505-2023
© Author(s) 2023. 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-20-1505-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
14 Apr 2023
Research article |
| 14 Apr 2023
| 14 Apr 2023
Calcification response of planktic foraminifera to environmental change in the western Mediterranean Sea during the industrial era
Thibauld M. Béjard
CORRESPONDING AUTHOR
Área de Paleontología, Departamento de Geología,
Universidad de Salamanca, 37008 Salamanca, Spain
Andrés S. Rigual-Hernández
Área de Paleontología, Departamento de Geología,
Universidad de Salamanca, 37008 Salamanca, Spain
José A. Flores
Área de Paleontología, Departamento de Geología,
Universidad de Salamanca, 37008 Salamanca, Spain
Javier P. Tarruella
Área de Paleontología, Departamento de Geología,
Universidad de Salamanca, 37008 Salamanca, Spain
Xavier Durrieu de Madron
CEFREM, CNRS-Université de Perpignan Via Domitia, Perpignan, France
Isabel Cacho
GRC Geociències Marines, Departament de Dinàmica de la Terra i
de l'Oceà, Facultat de Ciències de la Terra, Universitat de
Barcelona, Barcelona, Spain
Neghar Haghipour
Earth Sciences Department, ETH Zurich, 8092 Zurich, Switzerland
Aidan Hunter
British Antarctic Survey, Natural Environment Research Council,
Cambridge, UK
Francisco J. Sierro
Área de Paleontología, Departamento de Geología,
Universidad de Salamanca, 37008 Salamanca, Spain
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Hannah Gies, Frank Hagedorn, Maarten Lupker, Daniel Montluçon, Negar Haghipour, Tessa Sophia van der Voort, and Timothy Ian Eglinton
Biogeosciences, 18, 189–205, https://doi.org/10.5194/bg-18-189-2021, https://doi.org/10.5194/bg-18-189-2021, 2021
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Leticia G. Luz, Thiago P. Santos, Timothy I. Eglinton, Daniel Montluçon, Blanca Ausin, Negar Haghipour, Silvia M. Sousa, Renata H. Nagai, and Renato S. Carreira
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Two sediment cores retrieved from the SE Brazilian continental margin were studied using multiple organic (alkenones) and inorganic (oxygen isotopes in carbonate shells and water) proxies to reconstruct the sea surface temperature (SST) over the last 50 000 years. The findings indicate the formation of strong thermal gradients in the region during the last climate transition, a feature that may become more frequent in the future scenario of global water circulation changes.
Andrés S. Rigual Hernández, Thomas W. Trull, Scott D. Nodder, José A. Flores, Helen Bostock, Fátima Abrantes, Ruth S. Eriksen, Francisco J. Sierro, Diana M. Davies, Anne-Marie Ballegeer, Miguel A. Fuertes, and Lisa C. Northcote
Biogeosciences, 17, 245–263, https://doi.org/10.5194/bg-17-245-2020, https://doi.org/10.5194/bg-17-245-2020, 2020
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Coccolithophores account for a major fraction of the carbonate produced in the world's oceans. However, their contribution in the subantarctic Southern Ocean remains undocumented. We quantitatively partition calcium carbonate fluxes amongst coccolithophore species in the Australian–New Zealand sector of the Southern Ocean. We provide new insights into the importance of species other than Emiliania huxleyi in the carbon cycle and assess their possible response to projected environmental change.
Mariem Saavedra-Pellitero, Karl-Heinz Baumann, Miguel Ángel Fuertes, Hartmut Schulz, Yann Marcon, Nele Manon Vollmar, José-Abel Flores, and Frank Lamy
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Tessa Sophia van der Voort, Utsav Mannu, Frank Hagedorn, Cameron McIntyre, Lorenz Walthert, Patrick Schleppi, Negar Haghipour, and Timothy Ian Eglinton
Biogeosciences, 16, 3233–3246, https://doi.org/10.5194/bg-16-3233-2019, https://doi.org/10.5194/bg-16-3233-2019, 2019
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The carbon stored in soils is the largest reservoir of organic carbon on land. In the context of greenhouse gas emissions and a changing climate, it is very important to understand how stable the carbon in the soil is and why. The deeper parts of the soil have often been overlooked even though they store a lot of carbon. In this paper, we discovered that although deep soil carbon is expected to be old and stable, there can be a significant young component that cycles much faster.
Albert Català, Isabel Cacho, Jaime Frigola, Leopoldo D. Pena, and Fabrizio Lirer
Clim. Past, 15, 927–942, https://doi.org/10.5194/cp-15-927-2019, https://doi.org/10.5194/cp-15-927-2019, 2019
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We present a new high-resolution sea surface temperature (SST) reconstruction for the Holocene (last 11 700 years) in the westernmost Mediterranean Sea. We identify three sub-periods: the Early Holocene with warmest SST; the Middle Holocene with a cooling trend ending at 4200 years, which is identified as a double peak cooling event that marks the transition between the Middle and Late Holocene; and the Late Holocene with very different behaviour in both long- and short-term SST variability.
Monica Bini, Giovanni Zanchetta, Aurel Perşoiu, Rosine Cartier, Albert Català, Isabel Cacho, Jonathan R. Dean, Federico Di Rita, Russell N. Drysdale, Martin Finnè, Ilaria Isola, Bassem Jalali, Fabrizio Lirer, Donatella Magri, Alessia Masi, Leszek Marks, Anna Maria Mercuri, Odile Peyron, Laura Sadori, Marie-Alexandrine Sicre, Fabian Welc, Christoph Zielhofer, and Elodie Brisset
Clim. Past, 15, 555–577, https://doi.org/10.5194/cp-15-555-2019, https://doi.org/10.5194/cp-15-555-2019, 2019
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The Mediterranean region has returned some of the clearest evidence of a climatically dry period occurring approximately 4200 years ago. We reviewed selected proxies to infer regional climate patterns between 4.3 and 3.8 ka. Temperature data suggest a cooling anomaly, even if this is not uniform, whereas winter was drier, along with dry summers. However, some exceptions to this prevail, where wetter condition seems to have persisted, suggesting regional heterogeneity.
Gloria M. Martin-Garcia, Francisco J. Sierro, José A. Flores, and Fátima Abrantes
Clim. Past, 14, 1639–1651, https://doi.org/10.5194/cp-14-1639-2018, https://doi.org/10.5194/cp-14-1639-2018, 2018
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This work documents major oceanographic changes that occurred in the N. Atlantic from 812 to 530 ka and were related to the mid-Pleistocene transition. Since ~ 650 ka, glacials were more prolonged and intense than before. Larger ice sheets may have worked as a positive feedback mechanism to prolong the duration of glacials. We explore the connection between the change in the N. Atlantic oceanography and the enhanced ice-sheet growth, which contributed to the change of cyclicity in climate.
Ariadna Salabarnada, Carlota Escutia, Ursula Röhl, C. Hans Nelson, Robert McKay, Francisco J. Jiménez-Espejo, Peter K. Bijl, Julian D. Hartman, Stephanie L. Strother, Ulrich Salzmann, Dimitris Evangelinos, Adrián López-Quirós, José Abel Flores, Francesca Sangiorgi, Minoru Ikehara, and Henk Brinkhuis
Clim. Past, 14, 991–1014, https://doi.org/10.5194/cp-14-991-2018, https://doi.org/10.5194/cp-14-991-2018, 2018
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Here we reconstruct ice sheet and paleoceanographic configurations in the East Antarctic Wilkes Land margin based on a multi-proxy study conducted in late Oligocene (26–25 Ma) sediments from IODP Site U1356. The new obliquity-forced glacial–interglacial sedimentary model shows that, under the high CO2 values of the late Oligocene, ice sheets had mostly retreated to their terrestrial margins and the ocean was very dynamic with shifting positions of the polar fronts and associated water masses.
Muhammed Ojoshogu Usman, Frédérique Marie Sophie Anne Kirkels, Huub Michel Zwart, Sayak Basu, Camilo Ponton, Thomas Michael Blattmann, Michael Ploetze, Negar Haghipour, Cameron McIntyre, Francien Peterse, Maarten Lupker, Liviu Giosan, and Timothy Ian Eglinton
Biogeosciences, 15, 3357–3375, https://doi.org/10.5194/bg-15-3357-2018, https://doi.org/10.5194/bg-15-3357-2018, 2018
Andrés S. Rigual Hernández, José A. Flores, Francisco J. Sierro, Miguel A. Fuertes, Lluïsa Cros, and Thomas W. Trull
Biogeosciences, 15, 1843–1862, https://doi.org/10.5194/bg-15-1843-2018, https://doi.org/10.5194/bg-15-1843-2018, 2018
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Long-term and annual field observations on key organisms are a critical basis for predicting changes in Southern Ocean ecosystems. Coccolithophores are the most abundant calcium-carbonate-producing phytoplankton and play an important role in Southern Ocean biogeochemical cycles. In this study we document the composition, degree of calcification and annual cycle of coccolithophore communities in one of the largest unexplored regions of the world oceans: the Antarctic zone.
Saúl González-Lemos, José Guitián, Miguel-Ángel Fuertes, José-Abel Flores, and Heather M. Stoll
Biogeosciences, 15, 1079–1091, https://doi.org/10.5194/bg-15-1079-2018, https://doi.org/10.5194/bg-15-1079-2018, 2018
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Changes in atmospheric carbon dioxide affect ocean chemistry and the ability of marine organisms to manufacture shells from calcium carbonate. We describe a technique to obtain more reproducible measurements of the thickness of calcium carbonate shells made by microscopic marine algae called coccolithophores, which will allow researchers to compare how the shell thickness responds to variations in ocean chemistry in the past and present.
Blanca Ausín, Diana Zúñiga, Jose A. Flores, Catarina Cavaleiro, María Froján, Nicolás Villacieros-Robineau, Fernando Alonso-Pérez, Belén Arbones, Celia Santos, Francisco de la Granda, Carmen G. Castro, Fátima Abrantes, Timothy I. Eglinton, and Emilia Salgueiro
Biogeosciences, 15, 245–262, https://doi.org/10.5194/bg-15-245-2018, https://doi.org/10.5194/bg-15-245-2018, 2018
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A systematic investigation of the coccolithophore ecology was performed for the first time in the NW Iberian Margin to broaden our knowledge on the use of fossil coccoliths in marine sediment records to infer environmental conditions in the past. Coccolithophores proved to be significant primary producers and their abundance and distribution was favoured by warmer and nutrient–depleted waters during the upwelling regime, seasonally controlled offshore and influenced by coastal processes onshore.
Lorenz Wüthrich, Claudio Brändli, Régis Braucher, Heinz Veit, Negar Haghipour, Carla Terrizzano, Marcus Christl, Christian Gnägi, and Roland Zech
E&G Quaternary Sci. J., 66, 57–68, https://doi.org/10.5194/egqsj-66-57-2017, https://doi.org/10.5194/egqsj-66-57-2017, 2017
Liviu Giosan, Camilo Ponton, Muhammed Usman, Jerzy Blusztajn, Dorian Q. Fuller, Valier Galy, Negar Haghipour, Joel E. Johnson, Cameron McIntyre, Lukas Wacker, and Timothy I. Eglinton
Earth Surf. Dynam., 5, 781–789, https://doi.org/10.5194/esurf-5-781-2017, https://doi.org/10.5194/esurf-5-781-2017, 2017
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A reconstruction of erosion in the core monsoon zone of India provides unintuitive but fundamental insights: in contrast to semiarid regions that experience enhanced erosion during erratic rain events, the monsoon is annual and acts as a veritable
erosional pumpaccelerating when the land cover is minimal. The existence of such a monsoon erosional pump promises to reconcile conflicting views on the land–sea sediment and carbon transfer as well as the monsoon evolution on longer timescales.
Robert B. Sparkes, Ayça Doğrul Selver, Örjan Gustafsson, Igor P. Semiletov, Negar Haghipour, Lukas Wacker, Timothy I. Eglinton, Helen M. Talbot, and Bart E. van Dongen
The Cryosphere, 10, 2485–2500, https://doi.org/10.5194/tc-10-2485-2016, https://doi.org/10.5194/tc-10-2485-2016, 2016
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The permafrost in eastern Siberia contains large amounts of carbon frozen in soils and sediments. Continuing global warming is thawing the permafrost and releasing carbon to the Arctic Ocean. We used pyrolysis-GCMS, a chemical fingerprinting technique, to study the types of carbon being deposited on the continental shelf. We found large amounts of permafrost-sourced carbon being deposited up to 200 km offshore.
Mercè Cisneros, Isabel Cacho, Jaime Frigola, Miquel Canals, Pere Masqué, Belen Martrat, Marta Casado, Joan O. Grimalt, Leopoldo D. Pena, Giulia Margaritelli, and Fabrizio Lirer
Clim. Past, 12, 849–869, https://doi.org/10.5194/cp-12-849-2016, https://doi.org/10.5194/cp-12-849-2016, 2016
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We present a high-resolution multi-proxy study about the evolution of sea surface conditions along the last 2700 yr in the north-western Mediterranean Sea based on five sediment records from two different sites north of Minorca. The novelty of the results and the followed approach, constructing stack records from the studied proxies to preserve the most robust patterns, provides a special value to the study. This complex period appears to have significant regional changes in the climatic signal.
B. Ausín, I. Hernández-Almeida, J.-A. Flores, F.-J. Sierro, M. Grosjean, G. Francés, and B. Alonso
Clim. Past, 11, 1635–1651, https://doi.org/10.5194/cp-11-1635-2015, https://doi.org/10.5194/cp-11-1635-2015, 2015
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Coccolithophore distribution in 88 surface sediment samples in the Atlantic Ocean and western Mediterranean was mainly influenced by salinity at 10m depth. A quantitative coccolithophore-based transfer function was developed and applied to a fossil sediment core to estimate sea surface salinity (SSS). The quality of this function and the reliability of the SSS reconstruction were assessed by statistical analyses and discussed. Several centennial SSS changes are identified for the last 15.5 ka.
O. Rama-Corredor, B. Martrat, J. O. Grimalt, G. E. López-Otalvaro, J. A. Flores, and F. Sierro
Clim. Past, 11, 1297–1311, https://doi.org/10.5194/cp-11-1297-2015, https://doi.org/10.5194/cp-11-1297-2015, 2015
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The alkenone sea surface temperatures in the Guiana Basin show a rapid transmission of the climate variability from arctic to tropical latitudes during the last two interglacials (MIS1 and MIS5e) and warm long interstadials (MIS5d-a). In contrast, the abrupt variability of the glacial interval does follow the North Atlantic climate but is also shaped by precessional changes. This arctic to tropical decoupling occurs when the Atlantic meridional overturning circulation is substantially reduced.
A. S. Rigual-Hernández, T. W. Trull, S. G. Bray, A. Cortina, and L. K. Armand
Biogeosciences, 12, 5309–5337, https://doi.org/10.5194/bg-12-5309-2015, https://doi.org/10.5194/bg-12-5309-2015, 2015
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Diatom and major components of the flux collected by two sediment traps in subantarctic and polar frontal zones were studied. Despite significant differences in the composition and magnitude of the flux, POC flux was similar between sites. The development of a group of bloom-forming diatoms during summer led to the formation of aggregates and enhanced POC export. Our results suggest that high biogenic silica accumulation rates should be interpreted as a proxy for iron-limited diatom assemblages.
I. Hernández-Almeida, F.-J. Sierro, I. Cacho, and J.-A. Flores
Clim. Past, 11, 687–696, https://doi.org/10.5194/cp-11-687-2015, https://doi.org/10.5194/cp-11-687-2015, 2015
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This manuscript presents new Mg/Ca and previously published δ18O measurements of Neogloboquadrina pachyderma sinistral for MIS 31-19, from a sediment core from the subpolar North Atlantic. The mechanism proposed here involves northward subsurface transport of warm and salty subtropical waters during periods of weaker AMOC, leading to ice-sheet instability and IRD discharge. This is the first time that these rapid climate oscillations are described for the early Pleistocene.
O. Margalef, I. Cacho, S. Pla-Rabes, N. Cañellas-Boltà, J. J. Pueyo, A. Sáez, L. D. Pena, B. L. Valero-Garcés, V. Rull, and S. Giralt
Clim. Past Discuss., https://doi.org/10.5194/cpd-11-1407-2015, https://doi.org/10.5194/cpd-11-1407-2015, 2015
Manuscript not accepted for further review
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The Rano Aroi peat record (Easter Island, 27ºS) is characterized by six major events of enhanced precipitation between 38 and 65 kyr BP coinciding with Heinrich and Dansgaard-Oeschger (DO) Stadials. These events draw a coherent regional picture involving atmospheric and oceanic reorganization. The singular location of Easter Island, filling a gap in an area where marine records are not available, contributes to understand the mechanisms behind these global rapid climatic excursions.
F. Roullier, L. Berline, L. Guidi, X. Durrieu De Madron, M. Picheral, A. Sciandra, S. Pesant, and L. Stemmann
Biogeosciences, 11, 4541–4557, https://doi.org/10.5194/bg-11-4541-2014, https://doi.org/10.5194/bg-11-4541-2014, 2014
J. Martín, X. Durrieu de Madron, P. Puig, F. Bourrin, A. Palanques, L. Houpert, M. Higueras, A. Sanchez-Vidal, A. M. Calafat, M. Canals, S. Heussner, N. Delsaut, and C. Sotin
Biogeosciences, 10, 3221–3239, https://doi.org/10.5194/bg-10-3221-2013, https://doi.org/10.5194/bg-10-3221-2013, 2013
A. Pusceddu, M. Mea, M. Canals, S. Heussner, X. Durrieu de Madron, A. Sanchez-Vidal, S. Bianchelli, C. Corinaldesi, A. Dell'Anno, L. Thomsen, and R. Danovaro
Biogeosciences, 10, 2659–2670, https://doi.org/10.5194/bg-10-2659-2013, https://doi.org/10.5194/bg-10-2659-2013, 2013
M. Stabholz, X. Durrieu de Madron, M. Canals, A. Khripounoff, I. Taupier-Letage, P. Testor, S. Heussner, P. Kerhervé, N. Delsaut, L. Houpert, G. Lastras, and B. Dennielou
Biogeosciences, 10, 1097–1116, https://doi.org/10.5194/bg-10-1097-2013, https://doi.org/10.5194/bg-10-1097-2013, 2013
Related subject area
Paleobiogeoscience: Marine Record
Cenozoic pelagic accumulation rates and biased sampling of the deep-sea record
What controls planktic foraminiferal calcification?
Were early Archean carbonate factories major carbon sinks on the juvenile Earth?
Controls on Palaeogene deep-sea diatom-bearing sediment deposition and comparison with shallow marine environments
Decreasing foraminiferal flux in response to ongoing climate change in the Santa Barbara Basin, California
Coupled otolith and foraminifera oxygen and carbon stable isotopes evidence paleoceanographic changes and fish metabolic responses
Ideas and perspectives: Human impacts alter the marine fossil record
Origin and role of non-skeletal carbonate in coralligenous build-ups: new geobiological perspectives in biomineralization processes
Pacific Southern Ocean coccolithophore-derived particulate inorganic carbon (PIC): A novel comparative analysis of in-situ and satellite-derived measurements
Serpulid microbialitic bioherms from the upper Sarmatian (Middle Miocene) of the central Paratethys Sea (NW Hungary) – witnesses of a microbial sea
Massive corals record deforestation in Malaysian Borneo through sediments in river discharge
Nature and origin of variations in pelagic carbonate production in the tropical ocean since the mid-Miocene (ODP Site 927)
Variation in calcification of Reticulofenestra coccoliths over the Oligocene–Early Miocene
The influence of near-surface sediment hydrothermalism on the TEX86 tetraether-lipid-based proxy and a new correction for ocean bottom lipid overprinting
Testing the effect of bioturbation and species abundance upon discrete-depth individual foraminifera analysis
Test-size evolution of the planktonic foraminifer Globorotalia menardii in the eastern tropical Atlantic since the Late Miocene
Distribution of coccoliths in surface sediments across the Drake Passage and calcification of Emiliania huxleyi morphotypes
Vertical distribution of planktic foraminifera through an oxygen minimum zone: how assemblages and test morphology reflect oxygen concentrations
Reconstructing past variations in environmental conditions and paleoproductivity over the last ∼ 8000 years off north-central Chile (30° S)
A 15-million-year-long record of phenotypic evolution in the heavily calcified coccolithophore Helicosphaera and its biogeochemical implications
Shell chemistry of the boreal Campanian bivalve Rastellum diluvianum (Linnaeus, 1767) reveals temperature seasonality, growth rates and life cycle of an extinct Cretaceous oyster
Southern California margin benthic foraminiferal assemblages record recent centennial-scale changes in oxygen minimum zone
Baseline for ostracod-based northwestern Pacific and Indo-Pacific shallow-marine paleoenvironmental reconstructions: ecological modeling of species distributions
Neogene Caribbean elasmobranchs: diversity, paleoecology and paleoenvironmental significance of the Cocinetas Basin assemblage (Guajira Peninsula, Colombia)
Coastal primary productivity changes over the last millennium: a case study from the Skagerrak (North Sea)
A 1500-year multiproxy record of coastal hypoxia from the northern Baltic Sea indicates unprecedented deoxygenation over the 20th century
Technical note: An empirical method for absolute calibration of coccolith thickness
Reconstructing Holocene temperature and salinity variations in the western Baltic Sea region: a multi-proxy comparison from the Little Belt (IODP Expedition 347, Site M0059)
The oxic degradation of sedimentary organic matter 1400 Ma constrains atmospheric oxygen levels
Geochemical and microstructural characterisation of two species of cool-water bivalves (Fulvia tenuicostata and Soletellina biradiata) from Western Australia
Ecological response to collapse of the biological pump following the mass extinction at the Cretaceous–Paleogene boundary
Quantifying the Cenozoic marine diatom deposition history: links to the C and Si cycles
Anthropogenically induced environmental changes in the northeastern Adriatic Sea in the last 500 years (Panzano Bay, Gulf of Trieste)
Palaeohydrological changes over the last 50 ky in the central Gulf of Cadiz: complex forcing mechanisms mixing multi-scale processes
Dinocyst assemblage constraints on oceanographic and atmospheric processes in the eastern equatorial Atlantic over the last 44 kyr
Sedimentary response to sea ice and atmospheric variability over the instrumental period off Adélie Land, East Antarctica
Equatorward phytoplankton migration during a cold spell within the Late Cretaceous super-greenhouse
Upwellings mitigated Plio-Pleistocene heat stress for reef corals on the Florida platform (USA)
Millennial changes in North Atlantic oxygen concentrations
Vanishing coccolith vital effects with alleviated carbon limitation
Late Pleistocene glacial–interglacial shell-size–isotope variability in planktonic foraminifera as a function of local hydrography
Coral records of reef-water pH across the central Great Barrier Reef, Australia: assessing the influence of river runoff on inshore reefs
Records of past mid-depth ventilation: Cretaceous ocean anoxic event 2 vs. Recent oxygen minimum zones
Organomineral nanocomposite carbon burial during Oceanic Anoxic Event 2
Non-invasive imaging methods applied to neo- and paleo-ontological cephalopod research
Icehouse–greenhouse variations in marine denitrification
Changes in calcification of coccoliths under stable atmospheric CO2
Southern Hemisphere imprint for Indo-Asian summer monsoons during the last glacial period as revealed by Arabian Sea productivity records
The calcareous nannofossil Prinsiosphaera achieved rock-forming abundances in the latest Triassic of western Tethys: consequences for the δ13C of bulk carbonate
The Little Ice Age: evidence from a sediment record in Gullmar Fjord, Swedish west coast
Johan Renaudie and David B. Lazarus
Biogeosciences, 22, 1929–1946, https://doi.org/10.5194/bg-22-1929-2025, https://doi.org/10.5194/bg-22-1929-2025, 2025
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We provide a new compilation of rates at which sediments deposited in the deep sea over the last 70 million years. We highlight a bias, linked to the drilling process, that makes it more likely for high rates to be recovered for younger sediments than for older ones. Correcting for this bias, the record shows, contrary to prior estimates, a more stable history, thus providing some insights on the past mismatch between physico-chemical model estimates and observations.
Ruby Barrett, Joost de Vries, and Daniela N. Schmidt
Biogeosciences, 22, 791–807, https://doi.org/10.5194/bg-22-791-2025, https://doi.org/10.5194/bg-22-791-2025, 2025
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Planktic foraminifers are a plankton whose fossilised shell weight is used to reconstruct past environmental conditions such as seawater CO2. However, there is debate about whether other environmental drivers impact shell weight. Here we use a global data compilation and statistics to analyse what controls their weight. We find that the response varies between species and ocean basin, making it important to use regional calibrations and consider which species should be used to reconstruct CO2.
Wanli Xiang, Jan-Peter Duda, Andreas Pack, Mark van Zuilen, and Joachim Reitner
Biogeosciences, 21, 5653–5684, https://doi.org/10.5194/bg-21-5653-2024, https://doi.org/10.5194/bg-21-5653-2024, 2024
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We investigated the formation of early Archean (~3.5–3.4 Ga) carbonates in the Pilbara Craton, Western Australia, demonstrating the presence of an oceanic crust, an organo-carbonate, and a microbial carbonate factory. Notably, (a)biotic organic matter and hydrothermal fluids were centrally involved in carbonate precipitation. Since carbonates were widespread in the Archean, they may have constituted major carbon sinks that modulated early Earth’s carbon cycle and, hence, climate system.
Cécile Figus, Johan Renaudie, Or M. Bialik, and Jakub Witkowski
EGUsphere, https://doi.org/10.5194/egusphere-2024-3768, https://doi.org/10.5194/egusphere-2024-3768, 2024
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The compilation of Palaeogene deep-sea diatom-bearing sediment occurrences indicates that the deposition of diatom-bearing sediments is mainly controlled by nutrient availability and ocean circulation in the Atlantic, Pacific and Indian oceans. Comparison with shallow marine diatomites suggests that the peak in the number of diatom-bearing sites in the Atlantic may be related to tectonic reorganizations that caused the cessation of shallow marine diatomite deposition between ~46 and ~44 Ma.
Emily Havard, Katherine Cherry, Claudia Benitez-Nelson, Eric Tappa, and Catherine V. Davis
EGUsphere, https://doi.org/10.5194/egusphere-2024-3374, https://doi.org/10.5194/egusphere-2024-3374, 2024
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This study explores the impact of modern climate change on single-celled, marine organisms in the Santa Barbara Basin called foraminifera. We collect their shells as they sink to the seafloor and compare our record (2014–2021) to previous studies (1993–1998). We find substantial decreases in total foraminifera and warm-water species. Likely influenced by ocean acidification and regional water circulation, these changes have implications for the marine carbon cycle, ecosystem, and fossil record.
Konstantina Agiadi, Iuliana Vasiliev, Geanina Butiseacă, George Kontakiotis, Danae Thivaiou, Evangelia Besiou, Stergios Zarkogiannis, Efterpi Koskeridou, Assimina Antonarakou, and Andreas Mulch
Biogeosciences, 21, 3869–3881, https://doi.org/10.5194/bg-21-3869-2024, https://doi.org/10.5194/bg-21-3869-2024, 2024
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Seven million years ago, the marine gateway connecting the Mediterranean Sea with the Atlantic Ocean started to close, and, as a result, water circulation ceased. To find out how this phenomenon affected the fish living in the Mediterranean Sea, we examined the changes in the isotopic composition of otoliths of two common fish species. Although the species living at the surface fared pretty well, the bottom-water fish starved and eventually became extinct in the Mediterranean.
Rafał Nawrot, Martin Zuschin, Adam Tomašových, Michał Kowalewski, and Daniele Scarponi
Biogeosciences, 21, 2177–2188, https://doi.org/10.5194/bg-21-2177-2024, https://doi.org/10.5194/bg-21-2177-2024, 2024
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The youngest fossil record is a crucial source of data on the history of marine ecosystems and their long-term alteration by humans. However, human activities that reshape ecosystems also alter sedimentary and biological processes that control the formation of the geological archives recording those impacts. Thus, humans have been transforming the marine fossil record in ways that affect our ability to reconstruct past ecological and climate dynamics.
Mara Cipriani, Carmine Apollaro, Daniela Basso, Pietro Bazzicalupo, Marco Bertolino, Valentina Alice Bracchi, Fabio Bruno, Gabriele Costa, Rocco Dominici, Alessandro Gallo, Maurizio Muzzupappa, Antonietta Rosso, Rossana Sanfilippo, Francesco Sciuto, Giovanni Vespasiano, and Adriano Guido
Biogeosciences, 21, 49–72, https://doi.org/10.5194/bg-21-49-2024, https://doi.org/10.5194/bg-21-49-2024, 2024
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Who constructs the build-ups of the Mediterranean Sea? What is the role of skeletal and soft-bodied organisms in these bioconstructions? Do bacteria play a role in their formation? In this research, for the first time, the coralligenous of the Mediterranean shelf is studied from a geobiological point of view with an interdisciplinary biological and geological approach, highlighting important biotic relationships that can be used in interpreting the fossil build-up systems.
Mariem Saavedra-Pellitero, Karl-Heinz Baumann, Nuria Bachiller-Jareno, Harold Lovell, Nele Manon Vollmar, and Elisa Malinverno
EGUsphere, https://doi.org/10.5194/egusphere-2023-2801, https://doi.org/10.5194/egusphere-2023-2801, 2023
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In this manuscript we combine micropalaeontology and remote-sensing. We compare the calcium carbonate produced by tiny marine algae called coccolithophores to satellite-derived particulate organic carbon in the Southern Ocean. They show good agreement north of the polar front, but hugely differ south of it. We argue that those highly reflective values could be due to small opal particles and we highlight the need to improve satellite algorithms in this unexplored part of the ocean.
Mathias Harzhauser, Oleg Mandic, and Werner E. Piller
Biogeosciences, 20, 4775–4794, https://doi.org/10.5194/bg-20-4775-2023, https://doi.org/10.5194/bg-20-4775-2023, 2023
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Bowl-shaped spirorbid microbialite bioherms formed during the late Middle Miocene (Sarmatian) in the central Paratethys Sea under a warm, arid climate. The microbialites and the surrounding sediment document a predominance of microbial activity in the shallow marine environments of the sea at that time. Modern microbialites are not analogues for these unique structures, which reflect a series of growth stages with an initial “start-up stage”, massive “keep-up stage” and termination of growth.
Walid Naciri, Arnoud Boom, Matthew Payne, Nicola Browne, Noreen J. Evans, Philip Holdship, Kai Rankenburg, Ramasamy Nagarajan, Bradley J. McDonald, Jennifer McIlwain, and Jens Zinke
Biogeosciences, 20, 1587–1604, https://doi.org/10.5194/bg-20-1587-2023, https://doi.org/10.5194/bg-20-1587-2023, 2023
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In this study, we tested the ability of massive boulder-like corals to act as archives of land use in Malaysian Borneo to palliate the lack of accurate instrumental data on deforestation before the 1980s. We used mass spectrometry to measure trace element ratios in coral cores to use as a proxy for sediment in river discharge. Results showed an extremely similar increase between our proxy and the river discharge instrumental record, demonstrating the use of these corals as reliable archives.
Pauline Cornuault, Thomas Westerhold, Heiko Pälike, Torsten Bickert, Karl-Heinz Baumann, and Michal Kucera
Biogeosciences, 20, 597–618, https://doi.org/10.5194/bg-20-597-2023, https://doi.org/10.5194/bg-20-597-2023, 2023
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We generated high-resolution records of carbonate accumulation rate from the Miocene to the Quaternary in the tropical Atlantic Ocean to characterize the variability in pelagic carbonate production during warm climates. It follows orbital cycles, responding to local changes in tropical conditions, as well as to long-term shifts in climate and ocean chemistry. These changes were sufficiently large to play a role in the carbon cycle and global climate evolution.
José Guitián, Miguel Ángel Fuertes, José-Abel Flores, Iván Hernández-Almeida, and Heather Stoll
Biogeosciences, 19, 5007–5019, https://doi.org/10.5194/bg-19-5007-2022, https://doi.org/10.5194/bg-19-5007-2022, 2022
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The effect of environmental conditions on the degree of calcification of marine phytoplankton remains unclear. This study implements a new microscopic approach to quantify the calcification of ancient coccolithophores, using North Atlantic sediments. Results show significant differences in the thickness and shape factor of coccoliths for samples with minimum dissolution, providing the first evaluation of phytoplankton physiology adaptation to million-year-scale variable environmental conditions.
Jeremy N. Bentley, Gregory T. Ventura, Clifford C. Walters, Stefan M. Sievert, and Jeffrey S. Seewald
Biogeosciences, 19, 4459–4477, https://doi.org/10.5194/bg-19-4459-2022, https://doi.org/10.5194/bg-19-4459-2022, 2022
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We demonstrate the TEX86 (TetraEther indeX of 86 carbon atoms) paleoclimate proxy can become heavily impacted by the ocean floor archaeal community. The impact results from source inputs, their diagenetic and catagenetic alteration, and further overprint by the additions of lipids from the ocean floor sedimentary archaeal community. We then present a method to correct the overprints by using IPLs (intact polar lipids) extracted from both water column and subsurface archaeal communities.
Bryan C. Lougheed and Brett Metcalfe
Biogeosciences, 19, 1195–1209, https://doi.org/10.5194/bg-19-1195-2022, https://doi.org/10.5194/bg-19-1195-2022, 2022
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Measurements on sea-dwelling shelled organisms called foraminifera retrieved from deep-sea sediment cores have been used to reconstruct sea surface temperature (SST) variation. To evaluate the method, we use a computer model to simulate millions of single foraminifera and how they become mixed in the sediment after being deposited on the seafloor. We compare the SST inferred from the single foraminifera in the sediment core to the true SST in the water, thus quantifying method uncertainties.
Thore Friesenhagen
Biogeosciences, 19, 777–805, https://doi.org/10.5194/bg-19-777-2022, https://doi.org/10.5194/bg-19-777-2022, 2022
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Size measurements of the planktonic foraminifer Globorotalia menardii and related forms are used to investigate the shell-size evolution for the last 8 million years in the eastern tropical Atlantic Ocean. Long-term changes in the shell size coincide with major climatic, palaeogeographic and palaeoceanographic changes and suggest the occurrence of a new G. menardii type in the Atlantic Ocean ca. 2 million years ago.
Nele Manon Vollmar, Karl-Heinz Baumann, Mariem Saavedra-Pellitero, and Iván Hernández-Almeida
Biogeosciences, 19, 585–612, https://doi.org/10.5194/bg-19-585-2022, https://doi.org/10.5194/bg-19-585-2022, 2022
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We studied recent (sub-)fossil remains of a type of algae (coccolithophores) off southernmost Chile and across the Drake Passage, adding to the scarce knowledge that exists in the Southern Ocean, a rapidly changing environment. We found that those can be used to reconstruct the surface ocean conditions in the north but not in the south. We also found variations in shape in the dominant species Emiliania huxleyi depending on the location, indicating subtle adaptations to environmental conditions.
Catherine V. Davis, Karen Wishner, Willem Renema, and Pincelli M. Hull
Biogeosciences, 18, 977–992, https://doi.org/10.5194/bg-18-977-2021, https://doi.org/10.5194/bg-18-977-2021, 2021
Práxedes Muñoz, Lorena Rebolledo, Laurent Dezileau, Antonio Maldonado, Christoph Mayr, Paola Cárdenas, Carina B. Lange, Katherine Lalangui, Gloria Sanchez, Marco Salamanca, Karen Araya, Ignacio Jara, Gabriel Easton, and Marcel Ramos
Biogeosciences, 17, 5763–5785, https://doi.org/10.5194/bg-17-5763-2020, https://doi.org/10.5194/bg-17-5763-2020, 2020
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We analyze marine sedimentary records to study temporal changes in oxygen and productivity in marine waters of central Chile. We observed increasing oxygenation and decreasing productivity from 6000 kyr ago to the modern era that seem to respond to El Niño–Southern Oscillation activity. In the past centuries, deoxygenation and higher productivity are re-established, mainly in the northern zones of Chile and Peru. Meanwhile, in north-central Chile the deoxygenation trend is maintained.
Luka Šupraha and Jorijntje Henderiks
Biogeosciences, 17, 2955–2969, https://doi.org/10.5194/bg-17-2955-2020, https://doi.org/10.5194/bg-17-2955-2020, 2020
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The cell size, degree of calcification and growth rates of coccolithophores impact their role in the carbon cycle and may also influence their adaptation to environmental change. Combining insights from culture experiments and the fossil record, we show that the selection for smaller cells over the past 15 Myr has been a common adaptive trait among different lineages. However, heavily calcified species maintained a more stable biogeochemical output than the ancestral lineage of E. huxleyi.
Niels J. de Winter, Clemens V. Ullmann, Anne M. Sørensen, Nicolas Thibault, Steven Goderis, Stijn J. M. Van Malderen, Christophe Snoeck, Stijn Goolaerts, Frank Vanhaecke, and Philippe Claeys
Biogeosciences, 17, 2897–2922, https://doi.org/10.5194/bg-17-2897-2020, https://doi.org/10.5194/bg-17-2897-2020, 2020
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In this study, we present a detailed investigation of the chemical composition of 12 specimens of very well preserved, 78-million-year-old oyster shells from southern Sweden. The chemical data show how the oysters grew, the environment in which they lived and how old they became and also provide valuable information about which chemical measurements we can use to learn more about ancient climate and environment from such shells. In turn, this can help improve climate reconstructions and models.
Hannah M. Palmer, Tessa M. Hill, Peter D. Roopnarine, Sarah E. Myhre, Katherine R. Reyes, and Jonas T. Donnenfield
Biogeosciences, 17, 2923–2937, https://doi.org/10.5194/bg-17-2923-2020, https://doi.org/10.5194/bg-17-2923-2020, 2020
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Modern climate change is causing expansions of low-oxygen zones, with detrimental impacts to marine life. To better predict future ocean oxygen change, we study past expansions and contractions of low-oxygen zones using microfossils of seafloor organisms. We find that, along the San Diego margin, the low-oxygen zone expanded into more shallow water in the last 400 years, but the conditions within and below the low-oxygen zone did not change significantly in the last 1500 years.
Yuanyuan Hong, Moriaki Yasuhara, Hokuto Iwatani, and Briony Mamo
Biogeosciences, 16, 585–604, https://doi.org/10.5194/bg-16-585-2019, https://doi.org/10.5194/bg-16-585-2019, 2019
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This study analyzed microfaunal assemblages in surface sediments from 52 sites in Hong Kong marine waters. We selected 18 species for linear regression modeling to statistically reveal the relationship between species distribution and environmental factors. These results show environmental preferences of commonly distributed species on Asian coasts, providing a robust baseline for past environmental reconstruction of the broad Asian region using microfossils in sediment cores.
Jorge Domingo Carrillo-Briceño, Zoneibe Luz, Austin Hendy, László Kocsis, Orangel Aguilera, and Torsten Vennemann
Biogeosciences, 16, 33–56, https://doi.org/10.5194/bg-16-33-2019, https://doi.org/10.5194/bg-16-33-2019, 2019
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By combining taxonomy and geochemistry, we corroborated the described paleoenvironments from a Neogene fossiliferous deposit of South America. Shark teeth specimens were used for taxonomic identification and as proxies for geochemical analyses. With a multidisciplinary approach we refined the understanding about the paleoenvironmental setting and the paleoecological characteristics of the studied groups, in our case, for the bull shark and its incursions into brackish waters.
Anna Binczewska, Bjørg Risebrobakken, Irina Polovodova Asteman, Matthias Moros, Amandine Tisserand, Eystein Jansen, and Andrzej Witkowski
Biogeosciences, 15, 5909–5928, https://doi.org/10.5194/bg-15-5909-2018, https://doi.org/10.5194/bg-15-5909-2018, 2018
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Primary productivity is an important factor in the functioning and structuring of the coastal ecosystem. Thus, two sediment cores from the Skagerrak (North Sea) were investigated in order to obtain a comprehensive picture of primary productivity changes during the last millennium and identify associated forcing factors (e.g. anthropogenic, climate). The cores were dated and analysed for palaeoproductivity proxies and palaeothermometers.
Sami A. Jokinen, Joonas J. Virtasalo, Tom Jilbert, Jérôme Kaiser, Olaf Dellwig, Helge W. Arz, Jari Hänninen, Laura Arppe, Miia Collander, and Timo Saarinen
Biogeosciences, 15, 3975–4001, https://doi.org/10.5194/bg-15-3975-2018, https://doi.org/10.5194/bg-15-3975-2018, 2018
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Oxygen deficiency is a major environmental problem deteriorating seafloor habitats especially in the coastal ocean with large human impact. Here we apply a wide set of chemical and physical analyses to a 1500-year long sediment record and show that, although long-term climate variability has modulated seafloor oxygenation in the coastal northern Baltic Sea, the oxygen loss over the 20th century is unprecedentedly severe, emphasizing the need to reduce anthropogenic nutrient input in the future.
Saúl González-Lemos, José Guitián, Miguel-Ángel Fuertes, José-Abel Flores, and Heather M. Stoll
Biogeosciences, 15, 1079–1091, https://doi.org/10.5194/bg-15-1079-2018, https://doi.org/10.5194/bg-15-1079-2018, 2018
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Changes in atmospheric carbon dioxide affect ocean chemistry and the ability of marine organisms to manufacture shells from calcium carbonate. We describe a technique to obtain more reproducible measurements of the thickness of calcium carbonate shells made by microscopic marine algae called coccolithophores, which will allow researchers to compare how the shell thickness responds to variations in ocean chemistry in the past and present.
Ulrich Kotthoff, Jeroen Groeneveld, Jeanine L. Ash, Anne-Sophie Fanget, Nadine Quintana Krupinski, Odile Peyron, Anna Stepanova, Jonathan Warnock, Niels A. G. M. Van Helmond, Benjamin H. Passey, Ole Rønø Clausen, Ole Bennike, Elinor Andrén, Wojciech Granoszewski, Thomas Andrén, Helena L. Filipsson, Marit-Solveig Seidenkrantz, Caroline P. Slomp, and Thorsten Bauersachs
Biogeosciences, 14, 5607–5632, https://doi.org/10.5194/bg-14-5607-2017, https://doi.org/10.5194/bg-14-5607-2017, 2017
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We present reconstructions of paleotemperature, paleosalinity, and paleoecology from the Little Belt (Site M0059) over the past ~ 8000 years and evaluate the applicability of numerous proxies. Conditions were lacustrine until ~ 7400 cal yr BP. A transition to brackish–marine conditions then occurred within ~ 200 years. Salinity proxies rarely allowed quantitative estimates but revealed congruent results, while quantitative temperature reconstructions differed depending on the proxies used.
Shuichang Zhang, Xiaomei Wang, Huajian Wang, Emma U. Hammarlund, Jin Su, Yu Wang, and Donald E. Canfield
Biogeosciences, 14, 2133–2149, https://doi.org/10.5194/bg-14-2133-2017, https://doi.org/10.5194/bg-14-2133-2017, 2017
Liza M. Roger, Annette D. George, Jeremy Shaw, Robert D. Hart, Malcolm Roberts, Thomas Becker, Bradley J. McDonald, and Noreen J. Evans
Biogeosciences, 14, 1721–1737, https://doi.org/10.5194/bg-14-1721-2017, https://doi.org/10.5194/bg-14-1721-2017, 2017
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The shell compositions of bivalve species from south Western Australia are described here to better understand the factors involved in their formation. The shell composition can be used to reconstruct past environmental conditions, but certain species manifest an offset compared to the environmental parameters measured. As shown here, shells that experience the same conditions can present different compositions in relation to structure, organic composition and environmental conditions.
Johan Vellekoop, Lineke Woelders, Sanem Açikalin, Jan Smit, Bas van de Schootbrugge, Ismail Ö. Yilmaz, Henk Brinkhuis, and Robert P. Speijer
Biogeosciences, 14, 885–900, https://doi.org/10.5194/bg-14-885-2017, https://doi.org/10.5194/bg-14-885-2017, 2017
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The Cretaceous–Paleogene boundary, ~ 66 Ma, is characterized by a mass extinction. We studied groups of both surface-dwelling and bottom-dwelling organisms to unravel the oceanographic consequences of these extinctions. Our integrated records indicate that a reduction of the transport of organic matter to the sea floor resulted in enhanced recycling of nutrients in the upper water column and decreased food supply at the sea floor in the first tens of thousands of years after the extinctions.
Johan Renaudie
Biogeosciences, 13, 6003–6014, https://doi.org/10.5194/bg-13-6003-2016, https://doi.org/10.5194/bg-13-6003-2016, 2016
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Marine planktonic diatoms are today both the main silica and carbon exporter to the deep sea. However, 50 million years ago, radiolarians were the main silica exporter and diatoms were a rare, geographically restricted group. Quantification of their rise to dominance suggest that diatom abundance is primarily controlled by the continental weathering and has a negative feedback, observable on a geological timescale, on the carbon cycle.
Jelena Vidović, Rafał Nawrot, Ivo Gallmetzer, Alexandra Haselmair, Adam Tomašových, Michael Stachowitsch, Vlasta Ćosović, and Martin Zuschin
Biogeosciences, 13, 5965–5981, https://doi.org/10.5194/bg-13-5965-2016, https://doi.org/10.5194/bg-13-5965-2016, 2016
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We studied the ecological history of the Gulf of Trieste. Before the 20th century, the only activity here was ore mining, releasing high amounts of mercury into its northern part, Panzano Bay. Mercury did not cause changes to microorganisms, as it is not bioavailable. In the 20th century, agriculture caused nutrient enrichment in the bay and increased diversity of microorganisms. Industrial activities increased the concentrations of pollutants, causing only minor changes to microorganisms.
Aurélie Penaud, Frédérique Eynaud, Antje Helga Luise Voelker, and Jean-Louis Turon
Biogeosciences, 13, 5357–5377, https://doi.org/10.5194/bg-13-5357-2016, https://doi.org/10.5194/bg-13-5357-2016, 2016
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This paper presents new analyses conducted at high resolution in the Gulf of Cadiz over the last 50 ky. Palaeohydrological changes in these subtropical latitudes are discussed through dinoflagellate cyst assemblages but also dinocyst transfer function results, implying sea surface temperature and salinity as well as annual productivity reconstructions. This study is thus important for our understanding of past and future productivity regimes, also implying consequences on the biological pump.
William Hardy, Aurélie Penaud, Fabienne Marret, Germain Bayon, Tania Marsset, and Laurence Droz
Biogeosciences, 13, 4823–4841, https://doi.org/10.5194/bg-13-4823-2016, https://doi.org/10.5194/bg-13-4823-2016, 2016
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Our approach is based on a multi-proxy study from a core collected off the Congo River and discusses surface oceanic conditions (upwelling cells, river-induced upwelling), land–sea interactions and terrestrial erosion and in particular enables us to spatially constrain the migration of atmospheric systems. This paper thus presents new data highlighting, with the highest resolution ever reached in this region, the great correlation between phytoplanktonic organisms and monsoonal mechanisms.
Philippine Campagne, Xavier Crosta, Sabine Schmidt, Marie Noëlle Houssais, Olivier Ther, and Guillaume Massé
Biogeosciences, 13, 4205–4218, https://doi.org/10.5194/bg-13-4205-2016, https://doi.org/10.5194/bg-13-4205-2016, 2016
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Diatoms and biomarkers have been recently used for palaeoclimate reconstructions in the Southern Ocean. Few sediment-based ecological studies have investigated their relationships with environmental conditions. Here, we compare high-resolution sedimentary records with meteorological data to study relationships between our proxies and recent atmospheric and sea surface changes. Our results indicate that coupled wind pattern and sea surface variability act as the proximal forcing at that scale.
Niels A. G. M. van Helmond, Appy Sluijs, Nina M. Papadomanolaki, A. Guy Plint, Darren R. Gröcke, Martin A. Pearce, James S. Eldrett, João Trabucho-Alexandre, Ireneusz Walaszczyk, Bas van de Schootbrugge, and Henk Brinkhuis
Biogeosciences, 13, 2859–2872, https://doi.org/10.5194/bg-13-2859-2016, https://doi.org/10.5194/bg-13-2859-2016, 2016
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Over the past decades large changes have been observed in the biogeographical dispersion of marine life resulting from climate change. To better understand present and future trends it is important to document and fully understand the biogeographical response of marine life during episodes of environmental change in the geological past.
Here we investigate the response of phytoplankton, the base of the marine food web, to a rapid cold spell, interrupting greenhouse conditions during the Cretaceous.
Thomas C. Brachert, Markus Reuter, Stefan Krüger, Julia Kirkerowicz, and James S. Klaus
Biogeosciences, 13, 1469–1489, https://doi.org/10.5194/bg-13-1469-2016, https://doi.org/10.5194/bg-13-1469-2016, 2016
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We present stable isotope proxy data and calcification records from fossil reef corals. The corals investigated derive from the Florida carbonate platform and are of middle Pliocene to early Pleistocene age. From the data we infer an environment subject to intermittent upwelling on annual to decadal timescales. Calcification rates were enhanced during periods of upwelling. This is likely an effect of dampened SSTs during the upwelling.
B. A. A. Hoogakker, D. J. R. Thornalley, and S. Barker
Biogeosciences, 13, 211–221, https://doi.org/10.5194/bg-13-211-2016, https://doi.org/10.5194/bg-13-211-2016, 2016
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Models predict a decrease in future ocean O2, driven by surface water warming and freshening in the polar regions, causing a reduction in ocean circulation. Here we assess this effect in the past, focussing on the response of deep and intermediate waters from the North Atlantic during large-scale ice rafting and millennial-scale cooling events of the last glacial.
Our assessment agrees with the models but also highlights the importance of biological processes driving ocean O2 change.
M. Hermoso, I. Z. X. Chan, H. L. O. McClelland, A. M. C. Heureux, and R. E. M. Rickaby
Biogeosciences, 13, 301–312, https://doi.org/10.5194/bg-13-301-2016, https://doi.org/10.5194/bg-13-301-2016, 2016
B. Metcalfe, W. Feldmeijer, M. de Vringer-Picon, G.-J. A. Brummer, F. J. C. Peeters, and G. M. Ganssen
Biogeosciences, 12, 4781–4807, https://doi.org/10.5194/bg-12-4781-2015, https://doi.org/10.5194/bg-12-4781-2015, 2015
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Iron biogeochemical budgets during the natural ocean fertilisation experiment KEOPS-2 showed that complex circulation and transport pathways were responsible for differences in the mode and strength of iron supply, with vertical supply dominant on the plateau and lateral supply dominant in the plume. The exchange of iron between dissolved, biogenic and lithogenic pools was highly dynamic, resulting in a decoupling of iron supply and carbon export and controlling the efficiency of fertilisation.
J. P. D'Olivo, M. T. McCulloch, S. M. Eggins, and J. Trotter
Biogeosciences, 12, 1223–1236, https://doi.org/10.5194/bg-12-1223-2015, https://doi.org/10.5194/bg-12-1223-2015, 2015
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The boron isotope composition in the skeleton of massive Porites corals from the central Great Barrier Reef is used to reconstruct the seawater pH over the 1940-2009 period. The long-term decline in the coral-reconstructed seawater pH is in close agreement with estimates based on the CO2 uptake by surface waters due to rising atmospheric levels. We also observed a significant relationship between terrestrial runoff data and the inshore coral boron isotopes records.
J. Schönfeld, W. Kuhnt, Z. Erdem, S. Flögel, N. Glock, M. Aquit, M. Frank, and A. Holbourn
Biogeosciences, 12, 1169–1189, https://doi.org/10.5194/bg-12-1169-2015, https://doi.org/10.5194/bg-12-1169-2015, 2015
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Today’s oceans show distinct mid-depth oxygen minima while whole oceanic basins became transiently anoxic in the Mesozoic. To constrain past bottom-water oxygenation, we compared sediments from the Peruvian OMZ with the Cenomanian OAE 2 from Morocco. Corg accumulation rates in laminated OAE 2 sections match Holocene rates off Peru. Laminated deposits are found at oxygen levels of < 7µmol kg-1; crab burrows appear at 10µmol kg-1 today, both defining threshold values for palaeoreconstructions.
S. C. Löhr and M. J. Kennedy
Biogeosciences, 11, 4971–4983, https://doi.org/10.5194/bg-11-4971-2014, https://doi.org/10.5194/bg-11-4971-2014, 2014
R. Hoffmann, J. A. Schultz, R. Schellhorn, E. Rybacki, H. Keupp, S. R. Gerden, R. Lemanis, and S. Zachow
Biogeosciences, 11, 2721–2739, https://doi.org/10.5194/bg-11-2721-2014, https://doi.org/10.5194/bg-11-2721-2014, 2014
T. J. Algeo, P. A. Meyers, R. S. Robinson, H. Rowe, and G. Q. Jiang
Biogeosciences, 11, 1273–1295, https://doi.org/10.5194/bg-11-1273-2014, https://doi.org/10.5194/bg-11-1273-2014, 2014
C. Berger, K. J. S. Meier, H. Kinkel, and K.-H. Baumann
Biogeosciences, 11, 929–944, https://doi.org/10.5194/bg-11-929-2014, https://doi.org/10.5194/bg-11-929-2014, 2014
T. Caley, S. Zaragosi, J. Bourget, P. Martinez, B. Malaizé, F. Eynaud, L. Rossignol, T. Garlan, and N. Ellouz-Zimmermann
Biogeosciences, 10, 7347–7359, https://doi.org/10.5194/bg-10-7347-2013, https://doi.org/10.5194/bg-10-7347-2013, 2013
N. Preto, C. Agnini, M. Rigo, M. Sprovieri, and H. Westphal
Biogeosciences, 10, 6053–6068, https://doi.org/10.5194/bg-10-6053-2013, https://doi.org/10.5194/bg-10-6053-2013, 2013
I. Polovodova Asteman, K. Nordberg, and H. L. Filipsson
Biogeosciences, 10, 1275–1290, https://doi.org/10.5194/bg-10-1275-2013, https://doi.org/10.5194/bg-10-1275-2013, 2013
Cited articles
Aldridge, D., Beer, C. J., and Purdie, D. A.: Calcification in the
planktonic foraminifera; Globigerina bulloides; linked to phosphate concentrations in surface
waters of the North Atlantic Ocean, Biogeosciences, 9, 1725–1739,
https://doi.org/10.5194/bg-9-1725-2012, 2012.
Álvarez, M., Sanleón-Bartolomé, H., Tanhua, T., Mintrop, L.,
Luchetta, A., Cantoni, C., Schroeder, K., and Civitarese, G.: The CO2
system in the Mediterranean Sea: a basin wide perspective, Ocean Sci., 10,
69–92, https://doi.org/10.5194/os-10-69-2014, 2014.
Azibeiro, L. A., Kučera, M., Jonkers, L., Cloke-Hayes, A., and Sierro,
F. J.: Nutrients and hydrography explain the composition of recent
Mediterranean planktonic foraminiferal assemblages, Mar.
Micropaleontol., 179, 102201,
https://doi.org/10.1016/j.marmicro.2022.102201, 2023.
Barker, S. and Elderfield, H.: Foraminiferal Calcification Response to
Glacial-Interglacial Changes in Atmospheric CO2, Science, 297,
833–836, https://doi.org/10.1126/science.1072815, 2002.
Bé, A. W. H., Hutson, W. H., and Be, A. W. H.: Ecology of Planktonic
Foraminifera and Biogeographic Patterns of Life and Fossil Assemblages in
the Indian Ocean, Micropaleontology, 23, 369–414,
https://doi.org/10.2307/1485406, 1977.
Beaufort, L., Probert, I., and Buchet, N.: Effects of acidification and
primary production on coccolith weight: Implications for carbonate transfer
from the surface to the deep ocean: oceanic carbonate transfer, Geochem.
Geophy. Geosy., 8, Q08011, https://doi.org/10.1029/2006GC001493, 2007.
Beer, C. J., Schiebel, R., and Wilson, P. A.: Technical Note: On
methodologies for determining the size-normalised weight of planktic
foraminifera, Biogeosciences, 7, 2193–2198,
https://doi.org/10.5194/bg-7-2193-2010, 2010a.
Beer, C. J., Schiebel, R., and Wilson, P. A.: Testing planktic foraminiferal
shell weight as a surface water [CO
Béjard, T. M.: Supplementary data, Planktic foraminifera calcification in the NW Mediterranean, Mendeley Data [data set and code], V1, https://doi.org/10.17632/4t9x554dwz.1, 2022.
Bergamasco, A. and Malanotte-Rizzoli, P.: The circulation of the
Mediterranean Sea: a historical review of experimental investigations,
Adv. Oceanogr. Limnol., 1, 11–28,
https://doi.org/10.1080/19475721.2010.491656, 2010.
Berger, W. H.: Planktonic Foraminifera: Selective solution and the
lysocline, Mar. Geol., 8, 111–138, 1970.
Bethoux, J. P., Gentili, B., Morin, P., Nicolas, E., Pierre, C., and
Ruiz-Pino, D.: The Mediterranean Sea: a miniature ocean for climatic and
environmental studies and a key for the climatic functioning of the North
Atlantic, Prog. Oceanogr., 44, 131–146,
https://doi.org/10.1016/S0079-6611(99)00023-3, 1999.
Bijma, J., Hönisch, B., and Zeebe, R. E.: Impact of the ocean carbonate
chemistry on living foraminiferal shell weight: Comment on “Carbonate ion
concentration in glacial-age deep waters of the Caribbean Sea” by W. S.
Broecker and E. Clark: COMMENT, Geochem. Geophy. Geosy., 3, 1–7,
https://doi.org/10.1029/2002GC000388, 2002.
Bird, C., Darling, K. F., Russell, A. D., Davis, C. V., Fehrenbacher, J.,
Free, A., Wyman, M., and Ngwenya, B. T.: Cyanobacterial endobionts within a
major marine planktonic calcifier (Globigerina bulloides, Foraminifera) revealed by 16S rRNA
metabarcoding, Biogeosciences, 14, 901–920,
https://doi.org/10.5194/bg-14-901-2017, 2017.
Burke, J. E., Renema, W., Henehan, M. J., Elder, L. E., Davis, C. V., Maas,
A. E., Foster, G. L., Schiebel, R., and Hull, P. M.: Factors influencing
test porosity in planktonic foraminifera, Biogeosciences, 15, 6607–6619,
https://doi.org/10.5194/bg-15-6607-2018, 2018.
Chapman, M. R.: Seasonal production patterns of planktonic foraminifera in
the NE Atlantic Ocean: Implications for paleotemperature and hydrographic
reconstructions: currents, Paleoceanography, 25,
https://doi.org/10.1029/2008PA001708, 2010.
Cisneros, M., Cacho, I., Frigola, J., Canals, M., Masqué, P., Martrat,
B., Casado, M., Grimalt, J. O., Pena, L. D., Margaritelli, G., and Lirer,
F.: Sea surface temperature variability in the central-western Mediterranean
Sea during the last 2700 years: a multi-proxy and multi-record approach,
Clim. Past, 12, 849–869, https://doi.org/10.5194/cp-12-849-2016, 2016.
Coppola, L., Raimbault, P., Mortier, L., and Testor, P.: Monitoring the environment in the northwestern Mediterranean Sea, Eos, 100, https://doi.org/10.1029/2019EO125951, 2019.
Coppola, L., Diamond Riquier, E., and Carval, T: Dyfamed observatory
data, https://doi.org/10.17882/43749, 2021.
Davis, C. V., Rivest, E. B., Hill, T. M., Gaylord, B., Russell, A. D., and
Sanford, E.: Ocean acidification compromises a planktic calcifier with
implications for global carbon cycling, Sci. Rep., 7, 2225,
https://doi.org/10.1038/s41598-017-01530-9, 2017.
de Moel, H., Ganssen, G. M., Peeters, F. J. C., Jung, S. J. A., Kroon, D., Brummer, G. J. A., and Zeebe, R. E.: Planktic foraminiferal shell thinning in the Arabian Sea due to anthropogenic ocean acidification?, Biogeosciences, 6, 1917–1925, https://doi.org/10.5194/bg-6-1917-2009, 2009.
de Villiers, S.: Optimum growth conditions as opposed to calcite saturation
as a control on the calcification rate and shell-weight of marine
foraminifera, Mar. Biol., 144, 45–49,
https://doi.org/10.1007/s00227-003-1183-8, 2004.
Dickson, A. G.: Standard potential of the reaction: AgCl(s) + iH,(g) = Ag(s) + HCl(aq), and and the standard acidity constant of the ion HSOh in
synthetic sea water from 273.15 to 318.15 K, J. Chem. Thermodyn., 22, 113–127,
1990.
Dickson, A. G. and Millero, F. J.: A comparison of the equilibrium constants
for the dissociation of carbonic acid in seawater media, Deep-Sea Res., 34,
1733–1743, 1987.
Dittert, N., Baumann, K.-H., Bickert, T., Henrich, R., Huber, R., Kinkel, H., and Meggers, H.: Carbonate Dissolution in the Deep-Sea: Methods, Quantification and Paleoceanographic Application, in: Use of Proxies in Paleoceanography, edited by: Fischer, G. and Wefer, G., Springer Berlin Heidelberg, Berlin, Heidelberg, 255–284, https://doi.org/10.1007/978-3-642-58646-0_10, 1999.
Dolman, A. M., Groeneveld, J., Mollenhauer, G., Ho, S. L., and Laepple, T.:
Estimating Bioturbation From Replicated Small-Sample Radiocarbon Ages,
Paleoceanogr. Paleocl., 36, 7, https://doi.org/10.1029/2020PA004142,
2021.
Durrieu de Madron, X., Zervakis, V., Theocharis, A., and Georgopoulos, D.:
Comments on “Cascades of dense water around the world ocean”, Prog.
Oceanogr., 64, 83–90, https://doi.org/10.1016/j.pocean.2004.08.004,
2005.
Durrieu de Madron, X., Houpert, L., Puig, P., Sanchez-Vidal, A., Testor, P.,
Bosse, A., Estournel, C., Somot, S., Bourrin, F., Bouin, M. N., Beauverger,
M., Beguery, L., Calafat, A., Canals, M., Cassou, C., Coppola, L., Dausse,
D., D'Ortenzio, F., Font, J., Heussner, S., Kunesch, S., Lefevre, D., Le
Goff, H., Martín, J., Mortier, L., Palanques, A., and Raimbault, P.:
Interaction of dense shelf water cascading and open-sea convection in the
northwestern Mediterranean during winter 2012: shelf cascading and open-sea
convection, Geophys. Res. Lett., 40, 1379–1385,
https://doi.org/10.1002/grl.50331, 2013.
Durrieu de Madron, X., Ramondenc, S., Berline, L., Houpert, L., Bosse, A.,
Martini, S., Guidi, L., Conan, P., Curtil, C., Delsaut, N., Kunesch, S.,
Ghiglione, J. F., Marsaleix, P., Pujo-Pay, M., Séverin, T., Testor, P.,
Tamburini, C., and the ANTARES collaboration: Deep sediment resuspension and
thick nepheloid layer generation by open-ocean convection: BNL generation by
open-ocean convection, J. Geophys. Res.-Ocean., 122, 2291–2318,
https://doi.org/10.1002/2016JC012062, 2017.
Estrada, M., Marrasé, C., Latasa, M., Berdalet, E., Delgado, M., and
Riera, T.: Variability of deep chlorophyll maximum characteristics in the
Northwestern Mediterranean, Mar. Ecol. Prog. Ser., 92, 289–300,
https://doi.org/10.3354/meps092289, 1993.
Figuerola, B., Hancock, A. M., Bax, N., Cummings, V. J., Downey, R.,
Griffiths, H. J., Smith, J., and Stark, J. S.: A Review and Meta-Analysis of
Potential Impacts of Ocean Acidification on Marine Calcifiers From the
Southern Ocean, Front. Mar. Sci., 8, 584445,
https://doi.org/10.3389/fmars.2021.584445, 2021.
Fox, L., Stukins, S., Hill, T., and Miller, C. G.: Quantifying the Effect of
Anthropogenic Climate Change on Calcifying Plankton, Sci. Rep., 10, 1620,
https://doi.org/10.1038/s41598-020-58501-w, 2020.
Hassoun, A. E. R., Gemayel, E., Krasakopoulou, E., Goyet, C., Abboud-Abi
Saab, M., Guglielmi, V., Touratier, F., and Falco, C.: Acidification of the
Mediterranean Sea from anthropogenic carbon penetration, Deep-Sea Res.
Pt. I, 102, 1–15,
https://doi.org/10.1016/j.dsr.2015.04.005, 2015.
Hassoun, A. E. R., Bantelman, A., Canu, D., Comeau, S., Galdies, C.,
Gattuso, J.-P., Giani, M., Grelaud, M., Hendriks, I. E., Ibello, V.,
Idrissi, M., Krasakopoulou, E., Shaltout, N., Solidoro, C., Swarzenski, P.
W., and Ziveri, P.: Ocean acidification research in the Mediterranean Sea:
Status, trends and next steps, Front. Mar. Sci., 9, 892670,
https://doi.org/10.3389/fmars.2022.892670, 2022.
Head, M. J., Steffen, W., Fagerlind, D., Waters, C. N., Poirier, C., Syvitski, J., Zalasiewicz, J. A., Barnosky, A. D., Cearreta, A., Jeandel, C., Leinfelder, R., McNeill, J. R., Rose, N. L., Summerhayes, C., Wagreich, M., and Zinke, J.: The Great Acceleration is real and provides a quantitative basis for the proposed Anthropocene Series/Epoch, Episodes, 45, 359–376, https://doi.org/10.18814/epiiugs/2021/021031, 2022a.
Head, M. J., Steffen, W., Fagerlind, D., Waters, C. N., Poirier, C.,
Syvitski, J., Zalasiewicz, J. A., Barnosky, A. D., Cearreta, A., Jeandel,
C., Leinfelder, R., McNeill, J. R., Rose, N. L., Summerhayes, C., Wagreich,
M., and Zinke, J.: The Great Acceleration is real and provides a
quantitative basis for the proposed Anthropocene Series/Epoch, Episodes, 45,
359–376, https://doi.org/10.18814/epiiugs/2021/021031, 2022b.
Heaton, T. J., Köhler, P., Butzin, M., Bard, E., Reimer, R. W., Austin,
W. E. N., Bronk Ramsey, C., Grootes, P. M., Hughen, K. A., Kromer, B.,
Reimer, P. J., Adkins, J., Burke, A., Cook, M. S., Olsen, J., and Skinner,
L. C.: Marine20 – The Marine Radiocarbon Age Calibration Curve (0–55,000 cal BP), Radiocarbon, 62, 779–820, https://doi.org/10.1017/RDC.2020.68,
2020.
Hemleben, C., Spindler, M., and Anderson, O. R.: Modern Planktonic
Foraminifera, Springer, Berlin, https://doi.org/10.1007/978-1-4612-3544-6, 1989.
Heussner, S., Durrieu de Madron, X., Calafat, A., Canals, M., Carbonne, J.,
Delsaut, N., and Saragoni, G.: Spatial and temporal variability of downward
particle fluxes on a continental slope: Lessons from an 8-yr experiment in
the Gulf of Lions (NW Mediterranean), Mar. Geol., 234, 63–92,
https://doi.org/10.1016/j.margeo.2006.09.003, 2006.
Houpert, L., Durrieu de Madron, X., Testor, P., Bosse, A., D'Ortenzio, F.,
Bouin, M. N., Dausse, D., Le Goff, H., Kunesch, S., Labaste, M., Coppola,
L., Mortier, L., and Raimbault, P.: Observations of open-ocean deep
convection in the northwestern Mediterranean Sea: Seasonal and interannual
variability of mixing and deep water masses for the 2007–2013 Period: deep
convection obs, NWMED 2007–2013, J. Geophys. Res.-Ocean., 121, 8139–8171,
https://doi.org/10.1002/2016JC011857, 2016.
IPCC: The Ocean and Cryosphere in a Changing Climate: Special Report of the
Intergovernmental Panel on Climate Change, 1st Edn., Cambridge University
Press, https://doi.org/10.1017/9781009157964, 2022.
Jonkers, L., Hillebrand, H., and Kucera, M.: Global change drives modern
plankton communities away from the pre-industrial state, Nature, 570,
372–375, https://doi.org/10.1038/s41586-019-1230-3, 2019.
Kiss, P., Jonkers, L., Hudáčková, N., Reuter, R. T., Donner, B.,
Fischer, G., and Kucera, M.: Determinants of Planktonic Foraminifera Calcite
Flux: Implications for the Prediction of Intra- and Inter-Annual Pelagic
Carbonate Budgets, Global Biogeochem. Cy., 35,
https://doi.org/10.1029/2020GB006748, 2021.
Kroeker, K. J., Kordas, R. L., Crim, R., Hendriks, I. E., Ramajo, L., Singh,
G. S., Duarte, C. M., and Gattuso, J.: Impacts of ocean acidification on
marine organisms: quantifying sensitivities and interaction with warming,
Glob. Change Biol., 19, 1884–1896, https://doi.org/10.1111/gcb.12179, 2013.
Kuroyanagi, A. and Kawahata, H.: Vertical distribution of living planktonic
foraminifera in the seas around Japan, Mar. Micropaleontol., 53,
173–196, https://doi.org/10.1016/j.marmicro.2004.06.001, 2004.
Lazzari, P., Mattia, G., Solidoro, C., Salon, S., Crise, A., Zavatarelli, M., Oddo, P., and Vichi, M.: The impacts of climate change and environmental management policies on the trophic regimes in the Mediterranean Sea: Scenario analyses, J. Mar. Syst., 135, 137–149, https://doi.org/10.1016/j.jmarsys.2013.06.005, 2014.
LeGrande, A. N., Lynch-Stieglitz, J., and Farmer, E. C.: Oxygen isotopic
composition of Globorotalia truncatulinoides as a proxy for intermediate depth density: δ18O
Truncatulinoides as proxy for mid-depth density, Paleoceanography, 19, PA4025,
https://doi.org/10.1029/2004PA001045, 2004.
Lejeusne, C., Chevaldonné, P., Pergent-Martini, C., Boudouresque, C. F., and Pérez, T.: Climate change effects on a miniature ocean: the highly diverse, highly impacted Mediterranean Sea, Trends Ecol. Evol., 25, 250–260, https://doi.org/10.1016/j.tree.2009.10.009, 2010.
Lirer, F., Sprovieri, M., Vallefuoco, M., Ferraro, L., Pelosi, N., Giordano,
L., and Capotondi, L.: Planktonic foraminifera as bio-indicators for
monitoring the climatic changes that have occurred over the past 2000 years
in the southeastern Tyrrhenian Sea, Integr. Zool., 9, 542–554,
https://doi.org/10.1111/1749-4877.12083, 2014.
Lohmann, G. P. and Schweitzer, P. N.: Globorotalia truncatulinoides' Growth and chemistry as probes of the
past thermocline: 1. Shell size, Paleoceanography, 5, 55–75,
https://doi.org/10.1029/PA005i001p00055, 1990.
Lombard, F., Erez, J., Michel, E., and Labeyrie, L.: Temperature effect on
respiration and photosynthesis of the symbiont-bearing planktonic
foraminifera Globigerinoides ruber, Orbulina universa, and Globigerinella siphonifera, Limnol. Oceanogr., 54, 210–218,
https://doi.org/10.4319/lo.2009.54.1.0210, 2009.
Lombard, F., da Rocha, R. E., Bijma, J., and Gattuso, J.-P.: Effect of
carbonate ion concentration and irradiance on calcification in planktonic
foraminifera, Biogeosciences, 7, 247–255,
https://doi.org/10.5194/bg-7-247-2010, 2010.
Lombard, F., Labeyrie, L., Michel, E., Bopp, L., Cortijo, E., Retailleau,
S., Howa, H., and Jorissen, F.: Modelling planktic foraminifer growth and
distribution using an ecophysiological multi-species approach,
Biogeosciences, 8, 853–873, https://doi.org/10.5194/bg-8-853-2011, 2011.
Loulergue, L., Parrenin, F., Blunier, T., Barnola, J.-M., Spahni, R., Schilt, A., Raisbeck, G., and Chappellaz, J.: New constraints on the gas age-ice age difference along the EPICA ice cores, 0–50 kyr, Clim. Past, 3, 527–540, https://doi.org/10.5194/cp-3-527-2007, 2007.
Lüthi, D., Le Floch, M., Bereiter, B., Blunier, T., Barnola, J.-M.,
Siegenthaler, U., Raynaud, D., Jouzel, J., Fischer, H., Kawamura, K., and
Stocker, T. F.: High-resolution carbon dioxide concentration record
650,000–800,000 years before present, Nature, 453, 379–382,
https://doi.org/10.1038/nature06949, 2008.
Margaritelli, G.: Globorotalia truncatulinoides in Central - Western Mediterranean Sea during the Little
Ice Age, Mar. Micropaleontol., 161, 101921, https://doi.org/10.1016/j.marmicro.2020.101921, 2020.
Margaritelli, G., Lirer, F., Schroeder, K., Cloke-Hayes, A., Caruso, A.,
Capotondi, L., Broggy, T., Cacho, I., and Sierro, F. J.: Globorotalia truncatulinoides in the
Mediterranean Basin during the Middle–Late Holocene: Bio-Chronological and
Oceanographic Indicator, Geosciences, 12, 244–258,
https://doi.org/10.3390/geosciences12060244, 2022.
Marshall, B. J., Thunell, R. C., Henehan, M. J., Astor, Y., and Wejnert, K.
E.: Planktonic foraminiferal area density as a proxy for carbonate ion
concentration: A calibration study using the Cariaco Basin ocean time
series: foraminiferal area density [CO
Marty, J.-C., Chiavérini, J., Pizay, M.-D., and Avril, B.: Seasonal and
interannual dynamics of nutrients and phytoplankton pigments in the western
Mediterranean Sea at the DYFAMED time-series station (1991–1999), Deep-Sea
Res. Pt. II, 49, 1965–1985,
https://doi.org/10.1016/S0967-0645(02)00022-X, 2002.
MedECC: Climate and Environmental Change in the Mediterranean Basin – Current Situation and Risks for the Future, First Mediterranean Assessment Report, Zenodo, https://doi.org/10.5281/ZENODO.4768833, 2020.
Mehrbach, C., Culberson, C. H., Hawley, J. E., and Pytkowicx, R. M.:
measurement of the apparent dissociation constants of carbonic acid in
seawater at atmospheric pressure, Limnol. Oceanogr., 18, 897–907,
https://doi.org/10.4319/lo.1973.18.6.0897, 1973.
Meier, K. J. S., Beaufort, L., Heussner, S., Ziveri, P., and Université,
A.-M.: The role of ocean acidification in Emiliania huxleyi coccolith thinning in the
Mediterranean Sea, Biogeosciences, 11, 2857–2869, https://doi.org/10.5194/bg-11-2857-2014, 2014.
Millot, C.: The Gulf of Lions' hydrodynamics, Cont. Shelf Res.,
10, 885–894, https://doi.org/10.1016/0278-4343(90)90065-T, 1990.
Monaco, A., de Madron, X. D., Radakovitch, O., Heussner, S., and Carbonne,
J.: Origin and variability of downward biogeochemical fluxes on the Rhone
continental margin (NW mediterranean), Deep-Sea Res. Pt. I, 46, 1483–1511, https://doi.org/10.1016/S0967-0637(99)00014-X, 1999.
Moy, A. D., Howard, W. R., Bray, S. G., and Trull, T. W.: Reduced
calcification in modern Southern Ocean planktonic foraminifera, Nat.
Geosci., 2, 276–280, https://doi.org/10.1038/ngeo460, 2009.
Orr, J. C., Fabry, V. J., Aumont, O., Bopp, L., Doney, S. C., Feely, R. A.,
Gnanadesikan, A., Gruber, N., Ishida, A., Joos, F., Key, R. M., Lindsay, K.,
Maier-Reimer, E., Matear, R., Monfray, P., Mouchet, A., Najjar, R. G.,
Plattner, G.-K., Rodgers, K. B., Sabine, C. L., Sarmiento, J. L., Schlitzer,
R., Slater, R. D., Totterdell, I. J., Weirig, M.-F., Yamanaka, Y., and Yool,
A.: Anthropogenic ocean acidification over the twenty-first century and its
impact on calcifying organisms, Nature, 437, 681–686,
https://doi.org/10.1038/nature04095, 2005.
Osborne, E. B., Thunell, R. C., Marshall, B. J., Holm, J. A., Tappa, E. J.,
Benitez-Nelson, C., Cai, W., and Chen, B.: Calcification of the planktonic
foraminifera Globigerina bulloides and carbonate ion concentration: Results from the Santa
Barbara Basin, Paleoceanography, 31, 1083–1102,
https://doi.org/10.1002/2016PA002933, 2016.
Pallacks, S., Anglada-Ortiz, G., Belen Martrat, P Graham Mortyn, Grelaud,
M., Incarbona, A., Schiebel, R., Garcia-Orellana, J., and Ziveri, P.:
Western Mediterranean marine cores show that foraminiferal test calcite mass
is being influenced by enhanced anthropogenic pressure, AGU Ocean Science Meeting 2020,
https://doi.org/10.13140/RG.2.2.26245.99045, 2020.
Parrenin, F., Barnola, J.-M., Beer, J., Blunier, T., Castellano, E., Chappellaz, J., Dreyfus, G., Fischer, H., Fujita, S., Jouzel, J., Kawamura, K., Lemieux-Dudon, B., Loulergue, L., Masson-Delmotte, V., Narcisi, B., Petit, J.-R., Raisbeck, G., Raynaud, D., Ruth, U., Schwander, J., Severi, M., Spahni, R., Steffensen, J. P., Svensson, A., Udisti, R., Waelbroeck, C., and Wolff, E.: The EDC3 chronology for the EPICA Dome C ice core, Clim. Past, 3, 485–497, https://doi.org/10.5194/cp-3-485-2007, 2007.
Pujol, C. and Grazzini, C. V.: Distribution patterns of live planktic
foraminifers as related to regional hydrography and productive systems of
the Mediterranean Sea, Mar. Micropaleontol., 25, 187–217,
https://doi.org/10.1016/0377-8398(95)00002-I, 1995.
Rebotim, A., Voelker, A. H. L., Jonkers, L., Waniek, J. J., Meggers, H.,
Schiebel, R., Fraile, I., Schulz, M., and Kucera, M.: Factors controlling
the depth habitat of planktonic foraminifera in the subtropical eastern
North Atlantic, Biogeosciences, 14, 827–859,
https://doi.org/10.5194/bg-14-827-2017, 2017.
Reimer, P. J. and Reimer, R. W.: A Marine Reservoir Correction Database and
On-Line Interface, Radiocarbon, 43, 461–463,
https://doi.org/10.1017/S0033822200038339, 2001.
Rigual-Hernández, A. S., Sierro, F. J., Bárcena, M. A., Flores, J.
A., and Heussner, S.: Seasonal and interannual changes of planktic
foraminiferal fluxes in the Gulf of Lions (NW Mediterranean) and their
implications for paleoceanographic studies: Two 12-year sediment trap
records, Deep-Sea Res. Pt. I, 66,
26–40, https://doi.org/10.1016/j.dsr.2012.03.011, 2012.
Sabine, C. L., Feely, R. A., Gruber, N., Key, R. M., Lee, K., Bullister, J.
L., Wanninkhof, R., Wong, C. S., Wallace, D. W. R., Tilbrook, B., Millero,
F. J., Peng, T.-H., Kozyr, A., Ono, T., and Rios, A. F.: The Oceanic Sink
for Anthropogenic CO2, Science, 305, 367–371,
https://doi.org/10.1126/science.1097403, 2004.
Schiebel, R.: Planktic foraminiferal sedimentation and the marine calcite
budget: marine calcite budget, Global Biogeochem. Cy., 16, 1065–1086,
https://doi.org/10.1029/2001GB001459, 2002.
Schiebel, R. and Hemleben, C.: Interannual variability of planktic
foraminiferal populations and test flux in the eastern North Atlantic Ocean
(JGOFS), Deep-Sea Res. Pt. II, 47, 1809–1852, https://doi.org/10.1016/S0967-0645(00)00008-4, 2000.
Schiebel, R. and Hemleben, C.: Modern planktic foraminifera, Palaeont. Z.,
79, 135–148, 2005.
Schiebel, R. and Hemleben, C.: Planktic Foraminifers in the Modern Ocean,
Springer Berlin Heidelberg, Berlin, Heidelberg,
https://doi.org/10.1007/978-3-662-50297-6, 2017.
Schiebel, R., Waniek, J., Bork, M., and Hemleben, C.: Planktic foraminiferal
production stimulated by chlorophyll redistribution and entrainment of
nutrients, Deep-Sea Res. Pt. I, 48,
721–740, https://doi.org/10.1016/S0967-0637(00)00065-0, 2001.
Schiebel, R., Waniek, J., Zeltner, A., and Alves, M.: Impact of the Azores
Front on the distribution of planktic foraminifers, shelled gastropods, and
coccolithophorids, Deep-Sea Res. Pt. II, 49, 4035–4050, https://doi.org/10.1016/S0967-0645(02)00141-8,
2002.
Schmidt, D. N., Thierstein, H. R., and Bollmann, J.: The evolutionary history of size variation of planktic foraminiferal assemblages in the Cenozoic, 17 datasets, https://doi.org/10.1594/PANGAEA.694693, 2004.
Schneider, A., Wallace, D. W. R., and Körtzinger, A.: Alkalinity of the
Mediterranean Sea: alkalinity of the mediterranean sea, Geophys. Res. Lett.,
34, 15, https://doi.org/10.1029/2006GL028842, 2007.
Spero, H. J., Lerche, I., and Williams, D. F.: Opening the carbon isotope “vital effect” black box, 2, Quantitative model for interpreting foraminiferal carbon isotope data, Paleoceanography, 6, 639–655, https://doi.org/10.1029/91PA02022, 1991.
Stuiver, M. and Braziunas, T. F.: Modeling Atmospheric 14C Influences
and 14C Ages of Marine Samples to 10,000 BC, Radiocarbon, 35,
137–189, https://doi.org/10.1017/S0033822200013874, 1993.
Stuiver, M. and Reimer, P. J.: Extended 14 C Data Base and Revised
CALIB 3.0 14C Age Calibration Program, Radiocarbon, 35, 215–230,
https://doi.org/10.1017/S0033822200013904, 1993.
Takagi, H., Kimoto, K., Fujiki, T., Saito, H., Schmidt, C., Kucera, M., and
Moriya, K.: Characterizing photosymbiosis in modern planktonic foraminifera,
Biogeosciences, 16, 3377–3396, https://doi.org/10.5194/bg-16-3377-2019,
2019.
Wacker, U., Fiebig, J., and Schoene, B. R.: Clumped isotope analysis of carbonates: comparison of two different acid digestion techniques: Clumped isotope analysis of carbonates, Rapid Commun. Mass Spectrom., 27, 1631–1642, https://doi.org/10.1002/rcm.6609, 2013.
Weinkauf, M. F. G., Kunze, J. G., Waniek, J. J., and Kučera, M.:
Seasonal Variation in Shell Calcification of Planktonic Foraminifera in the
NE Atlantic Reveals Species-Specific Response to Temperature, Productivity,
and Optimum Growth Conditions, PLoS ONE, 11, e0148363,
https://doi.org/10.1371/journal.pone.0148363, 2016
Wilke, I., Meggers, H., and Bickert, T.: Depth habitats and seasonal
distributions of recent planktic foraminifers in the Canary Islands region
(29∘ N) based on oxygen isotopes, Deep-Sea Res. Pt. I, 56, 89–106,
https://doi.org/10.1016/j.dsr.2008.08.001, 2009.
Zarkogiannis, S. D., Iwasaki, S., Rae, J. W. B., Schmidt, M. W., Mortyn, P.
G., Kontakiotis, G., Hertzberg, J. E., and Rickaby, R. E. M.: Calcification,
Dissolution and Test Properties of Modern Planktonic Foraminifera From the
Central Atlantic Ocean, Front. Mar. Sci., 9, 864801,
https://doi.org/10.3389/fmars.2022.864801, 2022.
Ziveri, P.: Research turns to acidification and warming in the Mediterranean Sea, IMBER (Integrated Marine Biogeochemistry and Ecosystem Research), Newsletter, 20, 2012.
Short summary
The Mediterranean Sea is undergoing a rapid and unprecedented environmental change. Planktic foraminifera calcification is affected on different timescales. On seasonal and interannual scales, calcification trends differ according to the species and are linked mainly to sea surface temperatures and carbonate system parameters, while comparison with pre/post-industrial assemblages shows that all three species have reduced their calcification between 10 % to 35 % according to the species.
The Mediterranean Sea is undergoing a rapid and unprecedented environmental change. Planktic...
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