Regional imprints of millennial variability during the last 50,000 years around Antarctica
The climate of the last glacial Marine Isotopic Stage 3 (MIS3) period is characterized by strong millennialscale variability with a succession of DansgaardeOeschger events first identified in Greenland ice cores and associated with variations of the Atlantic Meridional Overturning Circulation (AMOC)...
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2012
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Online Access: | http://hdl.handle.net/11381/2538121 https://doi.org/10.1016/j.quascirev.2012.05.023 |
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ftunivparmairis:oai:air.unipr.it:11381/2538121 2024-04-21T07:51:29+00:00 Regional imprints of millennial variability during the last 50,000 years around Antarctica D. Buiron J. Chappellaz A. Landais M. Baumgartner M. Bonazza E. Capron M. Frezzotti M. Kageyama B. Lemieux Dudon V. Masson Delmotte F. Parrenin A. Schilt M. Severi B. Stenni D. Swingedouw R. Udisti SELMO, Enricomaria D., Buiron J., Chappellaz A., Landai M., Baumgartner M., Bonazza E., Capron M., Frezzotti M., Kageyama B., Lemieux Dudon V., Masson Delmotte F., Parrenin A., Schilt Selmo, Enricomaria M., Severi B., Stenni D., Swingedouw R., Udisti 2012 http://hdl.handle.net/11381/2538121 https://doi.org/10.1016/j.quascirev.2012.05.023 eng eng info:eu-repo/semantics/altIdentifier/wos/000308052100010 volume:48 firstpage:99 lastpage:112 numberofpages:14 journal:QUATERNARY SCIENCE REVIEWS http://hdl.handle.net/11381/2538121 doi:10.1016/j.quascirev.2012.05.023 info:eu-repo/semantics/article 2012 ftunivparmairis https://doi.org/10.1016/j.quascirev.2012.05.023 2024-03-28T01:23:22Z The climate of the last glacial Marine Isotopic Stage 3 (MIS3) period is characterized by strong millennialscale variability with a succession of DansgaardeOeschger events first identified in Greenland ice cores and associated with variations of the Atlantic Meridional Overturning Circulation (AMOC). These abrupt events have a smooth and lagged counterpart in water stable isotopes from Antarctic ice cores. In this study we aim at depicting and understanding the circum-Antarctic expression of this millennial-scale variability. To illustrate the mechanisms potentially at work in the response of the southern high latitudes to an abrupt decrease of the AMOC, we first present results from experiments performed with the IPSL-CM4 atmosphere-ocean coupled model under glacial boundary conditions. When the AMOC is perturbed by imposing an additional freshwater flux in the North Atlantic, our model produces the classical bipolar seesaw mechanism generally invoked to explain the warming of the Southern Ocean/ Antarctic region. However, this mechanism can be locally offset by faster atmospheric teleconnections originating from the tropics, even though the precise location of this fast response is not coherent among different climate models. Our model results are confronted with a synthesis of Antarctic records of ice core stable isotope and sea-salt sodium, including new data obtained on the TALDICE ice core. The IPSLCM4 produces a dipole-like pattern around Antarctica, with warming in the Atlantic/Indian sectors contrasting with an unexpected cooling in the East-Pacific sector. The latter signal is not detected in our data synthesis. Both ice core data and simulations are consistent in depicting a more rapid response of the Atlantic sector compared to the Indian sector. This feature can be explained by the gradual impact of ocean transport on which faster atmospheric teleconnections are superimposed. Detailed investigations of the sequence of events between different proxies are conducted in three ice cores. Earlier shifts ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Greenland Greenland ice cores ice core North Atlantic Southern Ocean Archivio della ricerca dell'Università di Parma (CINECA IRIS) Quaternary Science Reviews 48 99 112 |
institution |
Open Polar |
collection |
Archivio della ricerca dell'Università di Parma (CINECA IRIS) |
op_collection_id |
ftunivparmairis |
language |
English |
description |
The climate of the last glacial Marine Isotopic Stage 3 (MIS3) period is characterized by strong millennialscale variability with a succession of DansgaardeOeschger events first identified in Greenland ice cores and associated with variations of the Atlantic Meridional Overturning Circulation (AMOC). These abrupt events have a smooth and lagged counterpart in water stable isotopes from Antarctic ice cores. In this study we aim at depicting and understanding the circum-Antarctic expression of this millennial-scale variability. To illustrate the mechanisms potentially at work in the response of the southern high latitudes to an abrupt decrease of the AMOC, we first present results from experiments performed with the IPSL-CM4 atmosphere-ocean coupled model under glacial boundary conditions. When the AMOC is perturbed by imposing an additional freshwater flux in the North Atlantic, our model produces the classical bipolar seesaw mechanism generally invoked to explain the warming of the Southern Ocean/ Antarctic region. However, this mechanism can be locally offset by faster atmospheric teleconnections originating from the tropics, even though the precise location of this fast response is not coherent among different climate models. Our model results are confronted with a synthesis of Antarctic records of ice core stable isotope and sea-salt sodium, including new data obtained on the TALDICE ice core. The IPSLCM4 produces a dipole-like pattern around Antarctica, with warming in the Atlantic/Indian sectors contrasting with an unexpected cooling in the East-Pacific sector. The latter signal is not detected in our data synthesis. Both ice core data and simulations are consistent in depicting a more rapid response of the Atlantic sector compared to the Indian sector. This feature can be explained by the gradual impact of ocean transport on which faster atmospheric teleconnections are superimposed. Detailed investigations of the sequence of events between different proxies are conducted in three ice cores. Earlier shifts ... |
author2 |
D., Buiron J., Chappellaz A., Landai M., Baumgartner M., Bonazza E., Capron M., Frezzotti M., Kageyama B., Lemieux Dudon V., Masson Delmotte F., Parrenin A., Schilt Selmo, Enricomaria M., Severi B., Stenni D., Swingedouw R., Udisti |
format |
Article in Journal/Newspaper |
author |
D. Buiron J. Chappellaz A. Landais M. Baumgartner M. Bonazza E. Capron M. Frezzotti M. Kageyama B. Lemieux Dudon V. Masson Delmotte F. Parrenin A. Schilt M. Severi B. Stenni D. Swingedouw R. Udisti SELMO, Enricomaria |
spellingShingle |
D. Buiron J. Chappellaz A. Landais M. Baumgartner M. Bonazza E. Capron M. Frezzotti M. Kageyama B. Lemieux Dudon V. Masson Delmotte F. Parrenin A. Schilt M. Severi B. Stenni D. Swingedouw R. Udisti SELMO, Enricomaria Regional imprints of millennial variability during the last 50,000 years around Antarctica |
author_facet |
D. Buiron J. Chappellaz A. Landais M. Baumgartner M. Bonazza E. Capron M. Frezzotti M. Kageyama B. Lemieux Dudon V. Masson Delmotte F. Parrenin A. Schilt M. Severi B. Stenni D. Swingedouw R. Udisti SELMO, Enricomaria |
author_sort |
D. Buiron |
title |
Regional imprints of millennial variability during the last 50,000 years around Antarctica |
title_short |
Regional imprints of millennial variability during the last 50,000 years around Antarctica |
title_full |
Regional imprints of millennial variability during the last 50,000 years around Antarctica |
title_fullStr |
Regional imprints of millennial variability during the last 50,000 years around Antarctica |
title_full_unstemmed |
Regional imprints of millennial variability during the last 50,000 years around Antarctica |
title_sort |
regional imprints of millennial variability during the last 50,000 years around antarctica |
publishDate |
2012 |
url |
http://hdl.handle.net/11381/2538121 https://doi.org/10.1016/j.quascirev.2012.05.023 |
genre |
Antarc* Antarctic Antarctica Greenland Greenland ice cores ice core North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Greenland Greenland ice cores ice core North Atlantic Southern Ocean |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/000308052100010 volume:48 firstpage:99 lastpage:112 numberofpages:14 journal:QUATERNARY SCIENCE REVIEWS http://hdl.handle.net/11381/2538121 doi:10.1016/j.quascirev.2012.05.023 |
op_doi |
https://doi.org/10.1016/j.quascirev.2012.05.023 |
container_title |
Quaternary Science Reviews |
container_volume |
48 |
container_start_page |
99 |
op_container_end_page |
112 |
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1796934846752227328 |