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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American Association for the Advancement of Science
2023
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Online Access: | https://doi.org/10.1126/sciadv.add4909 |
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fteawag:oai:dora:eawag_30193 2024-09-15T18:23:20+00:00 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 https://doi.org/10.1126/sciadv.add4909 eng eng American Association for the Advancement of Science Science Advances--Sci. Adv.--journals:2605--2375-2548 eawag:30193 doi:10.1126/sciadv.add4909 scopus: 2-s2.0-85145526797 pmid: 36598985 journal id: journals:2605 e-issn: 2375-2548 ut: 000936020700013 Journal Article Text 2023 fteawag https://doi.org/10.1126/sciadv.add4909 2024-08-05T03:04:28Z 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 DORA Eawag Science Advances 9 1 |
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Open Polar |
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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 |
publishDate |
2023 |
url |
https://doi.org/10.1126/sciadv.add4909 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Science Advances--Sci. Adv.--journals:2605--2375-2548 eawag:30193 doi:10.1126/sciadv.add4909 scopus: 2-s2.0-85145526797 pmid: 36598985 journal id: journals:2605 e-issn: 2375-2548 ut: 000936020700013 |
op_doi |
https://doi.org/10.1126/sciadv.add4909 |
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Science Advances |
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9 |
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1 |
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1810463522986917888 |