Articles | Volume 18, issue 19
https://doi.org/10.5194/bg-18-5555-2021
© Author(s) 2021. 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-18-5555-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
14 Oct 2021
Research article |
| 14 Oct 2021
| 14 Oct 2021
Exploring the use of compound-specific carbon isotopes as a palaeoproductivity proxy off the coast of Adélie Land, East Antarctica
Kate E. Ashley
School of Geography, Earth and Environmental Sciences, University of
Birmingham, Edgbaston, Birmingham, B15 2TT, UK
Xavier Crosta
EPOC, UMR-CNRS 5805, Université de Bordeaux, 33615 Pessac, France
Johan Etourneau
EPOC, UMR-CNRS 5805, Université de Bordeaux, 33615 Pessac, France
EPHE/PSL Research University, 75014 Paris, France
Philippine Campagne
EPOC, UMR-CNRS 5805, Université de Bordeaux, 33615 Pessac, France
LOCEAN, UMR CNRS/UPCM/IRD/MNHN 7159, Université Pierre et Marie
Curie, 4 Place Jussieu, 75252 Paris, France
Harry Gilchrist
School of Geography, Earth and Environmental Sciences, University of
Birmingham, Edgbaston, Birmingham, B15 2TT, UK
Uthmaan Ibraheem
School of Geography, Earth and Environmental Sciences, University of
Birmingham, Edgbaston, Birmingham, B15 2TT, UK
Sarah E. Greene
School of Geography, Earth and Environmental Sciences, University of
Birmingham, Edgbaston, Birmingham, B15 2TT, UK
Sabine Schmidt
EPOC, UMR-CNRS 5805, Université de Bordeaux, 33615 Pessac, France
Yvette Eley
School of Geography, Earth and Environmental Sciences, University of
Birmingham, Edgbaston, Birmingham, B15 2TT, UK
Guillaume Massé
LOCEAN, UMR CNRS/UPCM/IRD/MNHN 7159, Université Pierre et Marie
Curie, 4 Place Jussieu, 75252 Paris, France
TAKUVIK, UMI 3376 UL/CNRS, Université Laval, 1045 avenue de la
Médecine, Quebec City, Quebec, G1V 0A6, Canada
School of Geography, Earth and Environmental Sciences, University of
Birmingham, Edgbaston, Birmingham, B15 2TT, UK
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Osamu Seki and James Bendle
Clim. Past Discuss., https://doi.org/10.5194/cp-2021-62, https://doi.org/10.5194/cp-2021-62, 2021
Manuscript not accepted for further review
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Fanny Lhardy, Nathaëlle Bouttes, Didier M. Roche, Xavier Crosta, Claire Waelbroeck, and Didier Paillard
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Climate models struggle to simulate a LGM ocean circulation in agreement with paleotracer data. Using a set of simulations, we test the impact of boundary conditions and other modelling choices. Model–data comparisons of sea-surface temperatures and sea-ice cover support an overall cold Southern Ocean, with implications on the AMOC strength. Changes in implemented boundary conditions are not sufficient to simulate a shallower AMOC; other mechanisms to better represent convection are required.
Philippe Massicotte, Rainer M. W. Amon, David Antoine, Philippe Archambault, Sergio Balzano, Simon Bélanger, Ronald Benner, Dominique Boeuf, Annick Bricaud, Flavienne Bruyant, Gwenaëlle Chaillou, Malik Chami, Bruno Charrière, Jing Chen, Hervé Claustre, Pierre Coupel, Nicole Delsaut, David Doxaran, Jens Ehn, Cédric Fichot, Marie-Hélène Forget, Pingqing Fu, Jonathan Gagnon, Nicole Garcia, Beat Gasser, Jean-François Ghiglione, Gaby Gorsky, Michel Gosselin, Priscillia Gourvil, Yves Gratton, Pascal Guillot, Hermann J. Heipieper, Serge Heussner, Stanford B. Hooker, Yannick Huot, Christian Jeanthon, Wade Jeffrey, Fabien Joux, Kimitaka Kawamura, Bruno Lansard, Edouard Leymarie, Heike Link, Connie Lovejoy, Claudie Marec, Dominique Marie, Johannie Martin, Jacobo Martín, Guillaume Massé, Atsushi Matsuoka, Vanessa McKague, Alexandre Mignot, William L. Miller, Juan-Carlos Miquel, Alfonso Mucci, Kaori Ono, Eva Ortega-Retuerta, Christos Panagiotopoulos, Tim Papakyriakou, Marc Picheral, Louis Prieur, Patrick Raimbault, Joséphine Ras, Rick A. Reynolds, André Rochon, Jean-François Rontani, Catherine Schmechtig, Sabine Schmidt, Richard Sempéré, Yuan Shen, Guisheng Song, Dariusz Stramski, Eri Tachibana, Alexandre Thirouard, Imma Tolosa, Jean-Éric Tremblay, Mickael Vaïtilingom, Daniel Vaulot, Frédéric Vaultier, John K. Volkman, Huixiang Xie, Guangming Zheng, and Marcel Babin
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The MALINA oceanographic expedition was conducted in the Mackenzie River and the Beaufort Sea systems. The sampling was performed across seven shelf–basin transects to capture the meridional gradient between the estuary and the open ocean. The main goal of this research program was to better understand how processes such as primary production are influencing the fate of organic matter originating from the surrounding terrestrial landscape during its transition toward the Arctic Ocean.
Kate E. Ashley, Robert McKay, Johan Etourneau, Francisco J. Jimenez-Espejo, Alan Condron, Anna Albot, Xavier Crosta, Christina Riesselman, Osamu Seki, Guillaume Massé, Nicholas R. Golledge, Edward Gasson, Daniel P. Lowry, Nicholas E. Barrand, Katelyn Johnson, Nancy Bertler, Carlota Escutia, Robert Dunbar, and James A. Bendle
Clim. Past, 17, 1–19, https://doi.org/10.5194/cp-17-1-2021, https://doi.org/10.5194/cp-17-1-2021, 2021
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We present a multi-proxy record of Holocene glacial meltwater input, sediment transport, and sea-ice variability off East Antarctica. Our record shows that a rapid Antarctic sea-ice increase during the mid-Holocene (~ 4.5 ka) occurred against a backdrop of increasing glacial meltwater input and gradual climate warming. We suggest that mid-Holocene ice shelf cavity expansion led to cooling of surface waters and sea-ice growth, which slowed basal ice shelf melting.
Tom Dunkley Jones, Yvette L. Eley, William Thomson, Sarah E. Greene, Ilya Mandel, Kirsty Edgar, and James A. Bendle
Clim. Past, 16, 2599–2617, https://doi.org/10.5194/cp-16-2599-2020, https://doi.org/10.5194/cp-16-2599-2020, 2020
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We explore the utiliity of the composition of fossil lipid biomarkers, which are commonly preserved in ancient marine sediments, in providing estimates of past ocean temperatures. The group of lipids concerned show compositional changes across the modern oceans that are correlated, to some extent, with local surface ocean temperatures. Here we present new machine learning approaches to improve our understanding of this temperature sensitivity and its application to reconstructing past climates.
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Short summary
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.
We explore the potential for the use of carbon isotopes of algal fatty acid as a new proxy for...
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