2013), North Atlantic climate response to Lake Agassiz drainage at coarse and ocean eddy-permitting resolutions
The North Atlantic climate response to the catastrophic drainage of proglacial Lake Agassiz into the Labrador Sea is analyzed with coarse and ocean eddy-permitting versions of a global coupled climate model. The North Atlantic climate response is qualitatively consistent in that a large-scale coolin...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.682.9990 2023-05-15T17:06:11+02:00 2013), North Atlantic climate response to Lake Agassiz drainage at coarse and ocean eddy-permitting resolutions Paul Spence Willem Sijp Matthew H. England The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.682.9990 http://web.science.unsw.edu.au/%7Ematthew/Spence_et_al_2013_FW_pulse.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.682.9990 http://web.science.unsw.edu.au/%7Ematthew/Spence_et_al_2013_FW_pulse.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://web.science.unsw.edu.au/%7Ematthew/Spence_et_al_2013_FW_pulse.pdf text ftciteseerx 2016-01-08T17:59:20Z The North Atlantic climate response to the catastrophic drainage of proglacial Lake Agassiz into the Labrador Sea is analyzed with coarse and ocean eddy-permitting versions of a global coupled climate model. The North Atlantic climate response is qualitatively consistent in that a large-scale cooling is simulated re-gardless of the model resolution or region of freshwater discharge. However, the magnitude and duration of the NorthAtlantic climate response is found to be sensitive tomodel resolution and the location of freshwater forcing. In particular, the long-term entrainment of freshwater along the boundary at higher resolution and its gradual, partially eddy-driven escape into the interior leads to low-salinity anomalies persisting in the sub-polar Atlantic for decades longer. As a result, the maximum decline of the Atlantic meridional overturning circulation (AMOC) and the ocean meridional heat transport (MHT) is amplified by about a factor of 2 at ocean eddy-permitting resolution, and the recovery is delayed relative to the coarse grid model. This, in turn, increases the long-term cooling in the high-resolution simulations. A decomposition of the MHT response reveals an increased role for transients and the horizontal mean component of MHT at higher resolution. With fixed wind stress curl, it is a stronger response of bottom pressure torque to the freshwater forcing at higher resolution that leads to a larger anomaly of the depth-integrated circulation. 1. Text Labrador Sea North Atlantic Unknown Curl ENVELOPE(-63.071,-63.071,-70.797,-70.797) |
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ftciteseerx |
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English |
description |
The North Atlantic climate response to the catastrophic drainage of proglacial Lake Agassiz into the Labrador Sea is analyzed with coarse and ocean eddy-permitting versions of a global coupled climate model. The North Atlantic climate response is qualitatively consistent in that a large-scale cooling is simulated re-gardless of the model resolution or region of freshwater discharge. However, the magnitude and duration of the NorthAtlantic climate response is found to be sensitive tomodel resolution and the location of freshwater forcing. In particular, the long-term entrainment of freshwater along the boundary at higher resolution and its gradual, partially eddy-driven escape into the interior leads to low-salinity anomalies persisting in the sub-polar Atlantic for decades longer. As a result, the maximum decline of the Atlantic meridional overturning circulation (AMOC) and the ocean meridional heat transport (MHT) is amplified by about a factor of 2 at ocean eddy-permitting resolution, and the recovery is delayed relative to the coarse grid model. This, in turn, increases the long-term cooling in the high-resolution simulations. A decomposition of the MHT response reveals an increased role for transients and the horizontal mean component of MHT at higher resolution. With fixed wind stress curl, it is a stronger response of bottom pressure torque to the freshwater forcing at higher resolution that leads to a larger anomaly of the depth-integrated circulation. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Paul Spence Willem Sijp Matthew H. England |
spellingShingle |
Paul Spence Willem Sijp Matthew H. England 2013), North Atlantic climate response to Lake Agassiz drainage at coarse and ocean eddy-permitting resolutions |
author_facet |
Paul Spence Willem Sijp Matthew H. England |
author_sort |
Paul Spence |
title |
2013), North Atlantic climate response to Lake Agassiz drainage at coarse and ocean eddy-permitting resolutions |
title_short |
2013), North Atlantic climate response to Lake Agassiz drainage at coarse and ocean eddy-permitting resolutions |
title_full |
2013), North Atlantic climate response to Lake Agassiz drainage at coarse and ocean eddy-permitting resolutions |
title_fullStr |
2013), North Atlantic climate response to Lake Agassiz drainage at coarse and ocean eddy-permitting resolutions |
title_full_unstemmed |
2013), North Atlantic climate response to Lake Agassiz drainage at coarse and ocean eddy-permitting resolutions |
title_sort |
2013), north atlantic climate response to lake agassiz drainage at coarse and ocean eddy-permitting resolutions |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.682.9990 http://web.science.unsw.edu.au/%7Ematthew/Spence_et_al_2013_FW_pulse.pdf |
long_lat |
ENVELOPE(-63.071,-63.071,-70.797,-70.797) |
geographic |
Curl |
geographic_facet |
Curl |
genre |
Labrador Sea North Atlantic |
genre_facet |
Labrador Sea North Atlantic |
op_source |
http://web.science.unsw.edu.au/%7Ematthew/Spence_et_al_2013_FW_pulse.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.682.9990 http://web.science.unsw.edu.au/%7Ematthew/Spence_et_al_2013_FW_pulse.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766061204853227520 |