North Atlantic cooling triggered a zonal mode over the Indian Ocean during Heinrich Stadial 1
Abrupt changes in the Atlantic meridional overturning circulation (AMOC) are thought to affect tropical hydroclimate through adjustment of the latitudinal position of the intertropical convergence zone (ITCZ). Heinrich Stadial 1 (HS1) involves the largest AMOC reduction in recent geological time; ho...
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Online Access: | https://archimer.ifremer.fr/doc/00814/92581/98858.pdf https://archimer.ifremer.fr/doc/00814/92581/98859.pdf https://doi.org/10.1126/sciadv.add4909 https://archimer.ifremer.fr/doc/00814/92581/ |
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ftarchimer:oai:archimer.ifremer.fr:92581 2023-12-24T10:23:08+01:00 North Atlantic cooling triggered a zonal mode over the Indian Ocean during Heinrich Stadial 1 Du, Xiaojing Russell, James M. Liu, Zhengyu Otto-bliesner, Bette L. Oppo, Delia W. Mohtadi, Mahyar Zhu, Chenyu Galy, Valier V. Schefuß, Enno Yan, Yan Rosenthal, Yair Dubois, Nathalie Arbuszewski, Jennifer Gao, Yu 2023-01 application/pdf https://archimer.ifremer.fr/doc/00814/92581/98858.pdf https://archimer.ifremer.fr/doc/00814/92581/98859.pdf https://doi.org/10.1126/sciadv.add4909 https://archimer.ifremer.fr/doc/00814/92581/ eng eng American Association for the Advancement of Science (AAAS) https://archimer.ifremer.fr/doc/00814/92581/98858.pdf https://archimer.ifremer.fr/doc/00814/92581/98859.pdf doi:10.1126/sciadv.add4909 https://archimer.ifremer.fr/doc/00814/92581/ info:eu-repo/semantics/openAccess restricted use Science Advances (2375-2548) (American Association for the Advancement of Science (AAAS)), 2023-01 , Vol. 9 , N. 1 , P. eadd4909 (9p.) text Article info:eu-repo/semantics/article 2023 ftarchimer https://doi.org/10.1126/sciadv.add4909 2023-11-28T23:51:10Z Abrupt changes in the Atlantic meridional overturning circulation (AMOC) are thought to affect tropical hydroclimate through adjustment of the latitudinal position of the intertropical convergence zone (ITCZ). Heinrich Stadial 1 (HS1) involves the largest AMOC reduction in recent geological time; however, over the tropical Indian Ocean (IO), proxy records suggest zonal anomalies featuring intense, widespread drought in tropical East Africa versus generally wet but heterogeneous conditions in the Maritime Continent. Here, we synthesize proxy data and an isotope-enabled transient deglacial simulation and show that the southward ITCZ shift over the eastern IO during HS1 strengthens IO Walker circulation, triggering an east-west precipitation dipole across the basin. This dipole reverses the zonal precipitation anomalies caused by the exposed Sunda and Sahul shelves due to glacial lower sea level. Our study illustrates how zonal modes of atmosphere-ocean circulation can amplify or reverse global climate anomalies, highlighting their importance for future climate change. Article in Journal/Newspaper North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Indian Sunda ENVELOPE(-6.982,-6.982,62.205,62.205) Science Advances 9 1 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
Abrupt changes in the Atlantic meridional overturning circulation (AMOC) are thought to affect tropical hydroclimate through adjustment of the latitudinal position of the intertropical convergence zone (ITCZ). Heinrich Stadial 1 (HS1) involves the largest AMOC reduction in recent geological time; however, over the tropical Indian Ocean (IO), proxy records suggest zonal anomalies featuring intense, widespread drought in tropical East Africa versus generally wet but heterogeneous conditions in the Maritime Continent. Here, we synthesize proxy data and an isotope-enabled transient deglacial simulation and show that the southward ITCZ shift over the eastern IO during HS1 strengthens IO Walker circulation, triggering an east-west precipitation dipole across the basin. This dipole reverses the zonal precipitation anomalies caused by the exposed Sunda and Sahul shelves due to glacial lower sea level. Our study illustrates how zonal modes of atmosphere-ocean circulation can amplify or reverse global climate anomalies, highlighting their importance for future climate change. |
format |
Article in Journal/Newspaper |
author |
Du, Xiaojing Russell, James M. Liu, Zhengyu Otto-bliesner, Bette L. Oppo, Delia W. Mohtadi, Mahyar Zhu, Chenyu Galy, Valier V. Schefuß, Enno Yan, Yan Rosenthal, Yair Dubois, Nathalie Arbuszewski, Jennifer Gao, Yu |
spellingShingle |
Du, Xiaojing Russell, James M. Liu, Zhengyu Otto-bliesner, Bette L. Oppo, Delia W. Mohtadi, Mahyar Zhu, Chenyu Galy, Valier V. Schefuß, Enno Yan, Yan Rosenthal, Yair Dubois, Nathalie Arbuszewski, Jennifer Gao, Yu North Atlantic cooling triggered a zonal mode over the Indian Ocean during Heinrich Stadial 1 |
author_facet |
Du, Xiaojing Russell, James M. Liu, Zhengyu Otto-bliesner, Bette L. Oppo, Delia W. Mohtadi, Mahyar Zhu, Chenyu Galy, Valier V. Schefuß, Enno Yan, Yan Rosenthal, Yair Dubois, Nathalie Arbuszewski, Jennifer Gao, Yu |
author_sort |
Du, Xiaojing |
title |
North Atlantic cooling triggered a zonal mode over the Indian Ocean during Heinrich Stadial 1 |
title_short |
North Atlantic cooling triggered a zonal mode over the Indian Ocean during Heinrich Stadial 1 |
title_full |
North Atlantic cooling triggered a zonal mode over the Indian Ocean during Heinrich Stadial 1 |
title_fullStr |
North Atlantic cooling triggered a zonal mode over the Indian Ocean during Heinrich Stadial 1 |
title_full_unstemmed |
North Atlantic cooling triggered a zonal mode over the Indian Ocean during Heinrich Stadial 1 |
title_sort |
north atlantic cooling triggered a zonal mode over the indian ocean during heinrich stadial 1 |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2023 |
url |
https://archimer.ifremer.fr/doc/00814/92581/98858.pdf https://archimer.ifremer.fr/doc/00814/92581/98859.pdf https://doi.org/10.1126/sciadv.add4909 https://archimer.ifremer.fr/doc/00814/92581/ |
long_lat |
ENVELOPE(-6.982,-6.982,62.205,62.205) |
geographic |
Indian Sunda |
geographic_facet |
Indian Sunda |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Science Advances (2375-2548) (American Association for the Advancement of Science (AAAS)), 2023-01 , Vol. 9 , N. 1 , P. eadd4909 (9p.) |
op_relation |
https://archimer.ifremer.fr/doc/00814/92581/98858.pdf https://archimer.ifremer.fr/doc/00814/92581/98859.pdf doi:10.1126/sciadv.add4909 https://archimer.ifremer.fr/doc/00814/92581/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1126/sciadv.add4909 |
container_title |
Science Advances |
container_volume |
9 |
container_issue |
1 |
_version_ |
1786196900273192960 |