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 hydro -climate 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;...
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ftncar:oai:drupal-site.org:articles_26147 2023-05-15T17:32:43+02:00 North Atlantic cooling triggered a zonal mode over the Indian Ocean during Heinrich Stadial 1 Du, Xiaojing (author) Russell, James M. (author) Liu, Zhengyu (author) Otto-Bliesner, Bette L. (author) Oppo, Delia W. (author) Mohtadi, Mahyar (author) Zhu, Chenyu (author) Galy, Valier V. (author) Schefuß, Enno (author) Yan, Yan (author) Rosenthal, Yair (author) Dubois, Nathalie (author) Arbuszewski, Jennifer (author) Gao, Yu (author) 2023-01-06 https://doi.org/10.1126/sciadv.add4909 en eng Science Advances--Sci. Adv.--2375-2548 articles:26147 doi:10.1126/sciadv.add4909 ark:/85065/d77p93bb Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. article Text 2023 ftncar https://doi.org/10.1126/sciadv.add4909 2023-04-10T18:09:00Z Abrupt changes in the Atlantic meridional overturning circulation (AMOC) are thought to affect tropical hydro -climate 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 OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Indian Sunda ENVELOPE(-6.982,-6.982,62.205,62.205) Science Advances 9 1 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
Abrupt changes in the Atlantic meridional overturning circulation (AMOC) are thought to affect tropical hydro -climate 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. |
author2 |
Du, Xiaojing (author) Russell, James M. (author) Liu, Zhengyu (author) Otto-Bliesner, Bette L. (author) Oppo, Delia W. (author) Mohtadi, Mahyar (author) Zhu, Chenyu (author) Galy, Valier V. (author) Schefuß, Enno (author) Yan, Yan (author) Rosenthal, Yair (author) Dubois, Nathalie (author) Arbuszewski, Jennifer (author) Gao, Yu (author) |
format |
Article in Journal/Newspaper |
title |
North Atlantic cooling triggered a zonal mode over the Indian Ocean during Heinrich Stadial 1 |
spellingShingle |
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 |
publishDate |
2023 |
url |
https://doi.org/10.1126/sciadv.add4909 |
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_relation |
Science Advances--Sci. Adv.--2375-2548 articles:26147 doi:10.1126/sciadv.add4909 ark:/85065/d77p93bb |
op_rights |
Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
op_doi |
https://doi.org/10.1126/sciadv.add4909 |
container_title |
Science Advances |
container_volume |
9 |
container_issue |
1 |
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1766130956339511296 |