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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ftunswworks:oai:unsworks.library.unsw.edu.au:1959.4/53701 2023-05-15T17:06:11+02:00 North Atlantic Climate Response to Lake Agassiz Drainage at Coarse and Ocean Eddy-Permitting Resolutions Spence, Paul Saenko, O Sijp, Willem England, Matthew 2013 application/pdf http://hdl.handle.net/1959.4/53701 https://unsworks.unsw.edu.au/bitstreams/10d063b3-1a2a-4e0a-8680-e73f110ccc37/download https://doi.org/10.1175/JCLI-D-11-00683.1 EN eng http://purl.org/au-research/grants/arc/CE110001028 http://hdl.handle.net/1959.4/53701 https://unsworks.unsw.edu.au/bitstreams/10d063b3-1a2a-4e0a-8680-e73f110ccc37/download http://dx.doi.org/10.1175/JCLI-D-11-00683.1 open access https://purl.org/coar/access_right/c_abf2 CC BY-NC-ND 3.0 https://creativecommons.org/licenses/by-nc-nd/3.0/au/ free_to_read © Copyright (2013) American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act September 2010 Page 2 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Act (17 USC §108, as revised by P.L. 94-553) does not require the AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a web site or in a searchable database, or other uses of this material, except as exempted by the above statement, requires written permission or a license from the AMS. Additional details are provided in the AMS Copyright Policy, available on the AMS Web site located at (http://www.ametsoc.org/) or from the AMS at 617-227-2425 or copyrights@ametsoc.org. CC-BY-NC-ND urn:ISSN:0894-8755 Journal of Climate, 26, 8, 2651-2667 journal article http://purl.org/coar/resource_type/c_6501 2013 ftunswworks https://doi.org/10.1175/JCLI-D-11-00683.1 2022-08-09T07:40:40Z 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 regardless of the model resolution or region of freshwater discharge. However, the magnitude and duration of the North Atlantic climate response is found to be sensitive to model 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 subpolar 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. Article in Journal/Newspaper Labrador Sea North Atlantic UNSW Sydney (The University of New South Wales): UNSWorks Curl ENVELOPE(-63.071,-63.071,-70.797,-70.797) Journal of Climate 26 8 2651 2667 |
institution |
Open Polar |
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UNSW Sydney (The University of New South Wales): UNSWorks |
op_collection_id |
ftunswworks |
language |
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 regardless of the model resolution or region of freshwater discharge. However, the magnitude and duration of the North Atlantic climate response is found to be sensitive to model 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 subpolar 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. |
format |
Article in Journal/Newspaper |
author |
Spence, Paul Saenko, O Sijp, Willem England, Matthew |
spellingShingle |
Spence, Paul Saenko, O Sijp, Willem England, Matthew North Atlantic Climate Response to Lake Agassiz Drainage at Coarse and Ocean Eddy-Permitting Resolutions |
author_facet |
Spence, Paul Saenko, O Sijp, Willem England, Matthew |
author_sort |
Spence, Paul |
title |
North Atlantic Climate Response to Lake Agassiz Drainage at Coarse and Ocean Eddy-Permitting Resolutions |
title_short |
North Atlantic Climate Response to Lake Agassiz Drainage at Coarse and Ocean Eddy-Permitting Resolutions |
title_full |
North Atlantic Climate Response to Lake Agassiz Drainage at Coarse and Ocean Eddy-Permitting Resolutions |
title_fullStr |
North Atlantic Climate Response to Lake Agassiz Drainage at Coarse and Ocean Eddy-Permitting Resolutions |
title_full_unstemmed |
North Atlantic Climate Response to Lake Agassiz Drainage at Coarse and Ocean Eddy-Permitting Resolutions |
title_sort |
north atlantic climate response to lake agassiz drainage at coarse and ocean eddy-permitting resolutions |
publishDate |
2013 |
url |
http://hdl.handle.net/1959.4/53701 https://unsworks.unsw.edu.au/bitstreams/10d063b3-1a2a-4e0a-8680-e73f110ccc37/download https://doi.org/10.1175/JCLI-D-11-00683.1 |
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 |
urn:ISSN:0894-8755 Journal of Climate, 26, 8, 2651-2667 |
op_relation |
http://purl.org/au-research/grants/arc/CE110001028 http://hdl.handle.net/1959.4/53701 https://unsworks.unsw.edu.au/bitstreams/10d063b3-1a2a-4e0a-8680-e73f110ccc37/download http://dx.doi.org/10.1175/JCLI-D-11-00683.1 |
op_rights |
open access https://purl.org/coar/access_right/c_abf2 CC BY-NC-ND 3.0 https://creativecommons.org/licenses/by-nc-nd/3.0/au/ free_to_read © Copyright (2013) American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act September 2010 Page 2 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Act (17 USC §108, as revised by P.L. 94-553) does not require the AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a web site or in a searchable database, or other uses of this material, except as exempted by the above statement, requires written permission or a license from the AMS. Additional details are provided in the AMS Copyright Policy, available on the AMS Web site located at (http://www.ametsoc.org/) or from the AMS at 617-227-2425 or copyrights@ametsoc.org. |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1175/JCLI-D-11-00683.1 |
container_title |
Journal of Climate |
container_volume |
26 |
container_issue |
8 |
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2651 |
op_container_end_page |
2667 |
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1766061195795628032 |