Linear weakening of the AMOC in response to receding glacial ice sheets in CCSM3
The transient response of the Atlantic Meridional Overturning Circulation (AMOC) to a deglacial ice sheet retreat is studied using the Community Climate System Model version 3 (CCSM3), with a focus on orographic effects rather than meltwater discharge. It is found that the AMOC weakens significantly...
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ftcdlib:oai:escholarship.org/ark:/13030/qt18f047t7 2023-05-15T16:39:43+02:00 Linear weakening of the AMOC in response to receding glacial ice sheets in CCSM3 Zhu, J Liu, Z Zhang, X Eisenman, I Liu, W 6252 - 6258 2014-09-16 application/pdf https://escholarship.org/uc/item/18f047t7 unknown eScholarship, University of California qt18f047t7 https://escholarship.org/uc/item/18f047t7 public Geophysical Research Letters, vol 41, iss 17 Atlantic Meridional Overturning Circulation ice sheet retreat ice sheet orography sea ice transport Meteorology & Atmospheric Sciences article 2014 ftcdlib 2021-03-28T08:18:47Z The transient response of the Atlantic Meridional Overturning Circulation (AMOC) to a deglacial ice sheet retreat is studied using the Community Climate System Model version 3 (CCSM3), with a focus on orographic effects rather than meltwater discharge. It is found that the AMOC weakens significantly (41%) in response to the deglacial ice sheet retreat. The AMOC weakening follows the decrease of the Northern Hemisphere ice sheet volume linearly, with no evidence of abrupt thresholds. A wind-driven mechanism is proposed to explain the weakening of the AMOC: lowering the Northern Hemisphere ice sheets induces a northward shift of the westerlies, which causes a rapid eastward sea ice transport and expanded sea ice cover over the subpolar North Atlantic; this expanded sea ice insulates the ocean from heat loss and leads to suppressed deep convection and a weakened AMOC. A sea ice-ocean positive feedback could be further established between the AMOC decrease and sea ice expansion. Article in Journal/Newspaper Ice Sheet North Atlantic Sea ice University of California: eScholarship |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Atlantic Meridional Overturning Circulation ice sheet retreat ice sheet orography sea ice transport Meteorology & Atmospheric Sciences |
spellingShingle |
Atlantic Meridional Overturning Circulation ice sheet retreat ice sheet orography sea ice transport Meteorology & Atmospheric Sciences Zhu, J Liu, Z Zhang, X Eisenman, I Liu, W Linear weakening of the AMOC in response to receding glacial ice sheets in CCSM3 |
topic_facet |
Atlantic Meridional Overturning Circulation ice sheet retreat ice sheet orography sea ice transport Meteorology & Atmospheric Sciences |
description |
The transient response of the Atlantic Meridional Overturning Circulation (AMOC) to a deglacial ice sheet retreat is studied using the Community Climate System Model version 3 (CCSM3), with a focus on orographic effects rather than meltwater discharge. It is found that the AMOC weakens significantly (41%) in response to the deglacial ice sheet retreat. The AMOC weakening follows the decrease of the Northern Hemisphere ice sheet volume linearly, with no evidence of abrupt thresholds. A wind-driven mechanism is proposed to explain the weakening of the AMOC: lowering the Northern Hemisphere ice sheets induces a northward shift of the westerlies, which causes a rapid eastward sea ice transport and expanded sea ice cover over the subpolar North Atlantic; this expanded sea ice insulates the ocean from heat loss and leads to suppressed deep convection and a weakened AMOC. A sea ice-ocean positive feedback could be further established between the AMOC decrease and sea ice expansion. |
format |
Article in Journal/Newspaper |
author |
Zhu, J Liu, Z Zhang, X Eisenman, I Liu, W |
author_facet |
Zhu, J Liu, Z Zhang, X Eisenman, I Liu, W |
author_sort |
Zhu, J |
title |
Linear weakening of the AMOC in response to receding glacial ice sheets in CCSM3 |
title_short |
Linear weakening of the AMOC in response to receding glacial ice sheets in CCSM3 |
title_full |
Linear weakening of the AMOC in response to receding glacial ice sheets in CCSM3 |
title_fullStr |
Linear weakening of the AMOC in response to receding glacial ice sheets in CCSM3 |
title_full_unstemmed |
Linear weakening of the AMOC in response to receding glacial ice sheets in CCSM3 |
title_sort |
linear weakening of the amoc in response to receding glacial ice sheets in ccsm3 |
publisher |
eScholarship, University of California |
publishDate |
2014 |
url |
https://escholarship.org/uc/item/18f047t7 |
op_coverage |
6252 - 6258 |
genre |
Ice Sheet North Atlantic Sea ice |
genre_facet |
Ice Sheet North Atlantic Sea ice |
op_source |
Geophysical Research Letters, vol 41, iss 17 |
op_relation |
qt18f047t7 https://escholarship.org/uc/item/18f047t7 |
op_rights |
public |
_version_ |
1766030048284901376 |