Southern Ocean sea-ice extent, productivity and iron flux over the past eight glacial cycles
International audience Sea ice and dust flux increased greatly in the Southern Ocean during the last glacial period. Palaeorecords provide contradictory evidence about marine productivity in this region, but beyond one glacial cycle, data were sparse. Here we present continuous chemical proxy data s...
Published in: | Nature |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2006
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Online Access: | https://insu.hal.science/insu-00375835 https://doi.org/10.1038/nature04614 |
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ftunigrenoble:oai:HAL:insu-00375835v1 |
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Université Grenoble Alpes: HAL |
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English |
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[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Wolff, E. Fischer, Hubertus Fundel, F. Ruth, U. Twarloh, B. Littot, G. Mulvaney, R. Röthlisberger, R. de Angelis, Martine Boutron, Claude F. Hansson, M. Jonsell, U. Hutterli, M. A. Lambert, F. Kaufmann, P. Stauffer, Bernard Stocker, Thomas F. Steffensen, J. P. Bigler, M. Siggaard-Andersen, M.-L. Udisti, Roberto Becagli, Silvia Castellano, E. Severi, Mirko Wagenbach, D. Barbante, Carlo Gabrielli, Paolo Gaspari, Vania Southern Ocean sea-ice extent, productivity and iron flux over the past eight glacial cycles |
topic_facet |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Sea ice and dust flux increased greatly in the Southern Ocean during the last glacial period. Palaeorecords provide contradictory evidence about marine productivity in this region, but beyond one glacial cycle, data were sparse. Here we present continuous chemical proxy data spanning the last eight glacial cycles (740,000 years) from the Dome C Antarctic ice core. These data constrain winter sea-ice extent in the Indian Ocean, Southern Ocean biogenic productivity and Patagonian climatic conditions. We found that maximum sea-ice extent is closely tied to Antarctic temperature on multi-millennial timescales, but less so on shorter timescales. Biological dimethylsulphide emissions south of the polar front seem to have changed little with climate, suggesting that sulphur compounds were not active in climate regulation. We observe large glacial–interglacial contrasts in iron deposition, which we infer reflects strongly changing Patagonian conditions. During glacial terminations, changes in Patagonia apparently preceded sea-ice reduction, indicating that multiple mechanisms may be responsible for different phases of CO2 increase during glacial terminations. We observe no changes in internal climatic feedbacks that could have caused the change in amplitude of Antarctic temperature variations observed 440,000 years ago. |
author2 |
British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Abteilung Klinische Sozialmedizin, Berufs- und Umweltdermatologie Universität Heidelberg Heidelberg = Heidelberg University Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Department of Physical Geography and Quaternary Geology Stockholm University Climate and Environmental Physics Bern (CEP) Physikalisches Institut Bern Universität Bern / University of Bern (UNIBE)-Universität Bern / University of Bern (UNIBE) Geophysics and Water Resources Section for Geology Copenhagen Department of Geosciences and Natural Resource Management Copenhagen (IGN) Faculty of Science Copenhagen University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH)-Faculty of Science Copenhagen University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH)-Department of Geosciences and Natural Resource Management Copenhagen (IGN) University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH) Department of Chemistry Università degli Studi di Firenze = University of Florence = Université de Florence (UniFI) Institut für Umweltphysik Heidelberg Institute for the Dynamics of Environmental Processes-CNR University of Ca’ Foscari Venice, Italy Environmental Sciences Department European Project for Ice Coring in Antarctica (EPICA) |
format |
Article in Journal/Newspaper |
author |
Wolff, E. Fischer, Hubertus Fundel, F. Ruth, U. Twarloh, B. Littot, G. Mulvaney, R. Röthlisberger, R. de Angelis, Martine Boutron, Claude F. Hansson, M. Jonsell, U. Hutterli, M. A. Lambert, F. Kaufmann, P. Stauffer, Bernard Stocker, Thomas F. Steffensen, J. P. Bigler, M. Siggaard-Andersen, M.-L. Udisti, Roberto Becagli, Silvia Castellano, E. Severi, Mirko Wagenbach, D. Barbante, Carlo Gabrielli, Paolo Gaspari, Vania |
author_facet |
Wolff, E. Fischer, Hubertus Fundel, F. Ruth, U. Twarloh, B. Littot, G. Mulvaney, R. Röthlisberger, R. de Angelis, Martine Boutron, Claude F. Hansson, M. Jonsell, U. Hutterli, M. A. Lambert, F. Kaufmann, P. Stauffer, Bernard Stocker, Thomas F. Steffensen, J. P. Bigler, M. Siggaard-Andersen, M.-L. Udisti, Roberto Becagli, Silvia Castellano, E. Severi, Mirko Wagenbach, D. Barbante, Carlo Gabrielli, Paolo Gaspari, Vania |
author_sort |
Wolff, E. |
title |
Southern Ocean sea-ice extent, productivity and iron flux over the past eight glacial cycles |
title_short |
Southern Ocean sea-ice extent, productivity and iron flux over the past eight glacial cycles |
title_full |
Southern Ocean sea-ice extent, productivity and iron flux over the past eight glacial cycles |
title_fullStr |
Southern Ocean sea-ice extent, productivity and iron flux over the past eight glacial cycles |
title_full_unstemmed |
Southern Ocean sea-ice extent, productivity and iron flux over the past eight glacial cycles |
title_sort |
southern ocean sea-ice extent, productivity and iron flux over the past eight glacial cycles |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://insu.hal.science/insu-00375835 https://doi.org/10.1038/nature04614 |
geographic |
Antarctic Indian Patagonia Southern Ocean |
geographic_facet |
Antarctic Indian Patagonia Southern Ocean |
genre |
Antarc* Antarctic ice core Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic ice core Sea ice Southern Ocean |
op_source |
ISSN: 0028-0836 EISSN: 1476-4687 Nature https://insu.hal.science/insu-00375835 Nature, 2006, 440 (7083), pp.491 à 496. ⟨10.1038/nature04614⟩ |
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info:eu-repo/semantics/altIdentifier/doi/10.1038/nature04614 insu-00375835 https://insu.hal.science/insu-00375835 doi:10.1038/nature04614 |
op_doi |
https://doi.org/10.1038/nature04614 |
container_title |
Nature |
container_volume |
440 |
container_issue |
7083 |
container_start_page |
491 |
op_container_end_page |
496 |
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1798835513174523904 |
spelling |
ftunigrenoble:oai:HAL:insu-00375835v1 2024-05-12T07:55:41+00:00 Southern Ocean sea-ice extent, productivity and iron flux over the past eight glacial cycles Wolff, E. Fischer, Hubertus Fundel, F. Ruth, U. Twarloh, B. Littot, G. Mulvaney, R. Röthlisberger, R. de Angelis, Martine Boutron, Claude F. Hansson, M. Jonsell, U. Hutterli, M. A. Lambert, F. Kaufmann, P. Stauffer, Bernard Stocker, Thomas F. Steffensen, J. P. Bigler, M. Siggaard-Andersen, M.-L. Udisti, Roberto Becagli, Silvia Castellano, E. Severi, Mirko Wagenbach, D. Barbante, Carlo Gabrielli, Paolo Gaspari, Vania British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Abteilung Klinische Sozialmedizin, Berufs- und Umweltdermatologie Universität Heidelberg Heidelberg = Heidelberg University Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Department of Physical Geography and Quaternary Geology Stockholm University Climate and Environmental Physics Bern (CEP) Physikalisches Institut Bern Universität Bern / University of Bern (UNIBE)-Universität Bern / University of Bern (UNIBE) Geophysics and Water Resources Section for Geology Copenhagen Department of Geosciences and Natural Resource Management Copenhagen (IGN) Faculty of Science Copenhagen University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH)-Faculty of Science Copenhagen University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH)-Department of Geosciences and Natural Resource Management Copenhagen (IGN) University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH) Department of Chemistry Università degli Studi di Firenze = University of Florence = Université de Florence (UniFI) Institut für Umweltphysik Heidelberg Institute for the Dynamics of Environmental Processes-CNR University of Ca’ Foscari Venice, Italy Environmental Sciences Department European Project for Ice Coring in Antarctica (EPICA) 2006 https://insu.hal.science/insu-00375835 https://doi.org/10.1038/nature04614 en eng HAL CCSD Nature Publishing Group info:eu-repo/semantics/altIdentifier/doi/10.1038/nature04614 insu-00375835 https://insu.hal.science/insu-00375835 doi:10.1038/nature04614 ISSN: 0028-0836 EISSN: 1476-4687 Nature https://insu.hal.science/insu-00375835 Nature, 2006, 440 (7083), pp.491 à 496. ⟨10.1038/nature04614⟩ [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2006 ftunigrenoble https://doi.org/10.1038/nature04614 2024-04-18T03:02:45Z International audience Sea ice and dust flux increased greatly in the Southern Ocean during the last glacial period. Palaeorecords provide contradictory evidence about marine productivity in this region, but beyond one glacial cycle, data were sparse. Here we present continuous chemical proxy data spanning the last eight glacial cycles (740,000 years) from the Dome C Antarctic ice core. These data constrain winter sea-ice extent in the Indian Ocean, Southern Ocean biogenic productivity and Patagonian climatic conditions. We found that maximum sea-ice extent is closely tied to Antarctic temperature on multi-millennial timescales, but less so on shorter timescales. Biological dimethylsulphide emissions south of the polar front seem to have changed little with climate, suggesting that sulphur compounds were not active in climate regulation. We observe large glacial–interglacial contrasts in iron deposition, which we infer reflects strongly changing Patagonian conditions. During glacial terminations, changes in Patagonia apparently preceded sea-ice reduction, indicating that multiple mechanisms may be responsible for different phases of CO2 increase during glacial terminations. We observe no changes in internal climatic feedbacks that could have caused the change in amplitude of Antarctic temperature variations observed 440,000 years ago. Article in Journal/Newspaper Antarc* Antarctic ice core Sea ice Southern Ocean Université Grenoble Alpes: HAL Antarctic Indian Patagonia Southern Ocean Nature 440 7083 491 496 |