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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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/591867 2023-05-15T17:32:42+02:00 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 2023-01-06 application/application/pdf https://hdl.handle.net/20.500.11850/591867 https://doi.org/10.3929/ethz-b-000591867 en eng American Association for the Advancement of Science info:eu-repo/semantics/altIdentifier/doi/10.1126/sciadv.add4909 info:eu-repo/semantics/altIdentifier/wos/000936020700013 http://hdl.handle.net/20.500.11850/591867 doi:10.3929/ethz-b-000591867 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc/4.0/ Creative Commons Attribution-NonCommercial 4.0 International Science Advances, 9 (1) info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2023 ftethz https://doi.org/20.500.11850/59186710.3929/ethz-b-00059186710.1126/sciadv.add4909 2023-03-26T23:42:14Z 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. ISSN:2375-2548 Article in Journal/Newspaper North Atlantic ETH Zürich Research Collection Indian Sunda ENVELOPE(-6.982,-6.982,62.205,62.205) |
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Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
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. ISSN:2375-2548 |
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://hdl.handle.net/20.500.11850/591867 https://doi.org/10.3929/ethz-b-000591867 |
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, 9 (1) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1126/sciadv.add4909 info:eu-repo/semantics/altIdentifier/wos/000936020700013 http://hdl.handle.net/20.500.11850/591867 doi:10.3929/ethz-b-000591867 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc/4.0/ Creative Commons Attribution-NonCommercial 4.0 International |
op_doi |
https://doi.org/20.500.11850/59186710.3929/ethz-b-00059186710.1126/sciadv.add4909 |
_version_ |
1766130935901716480 |