The role of meltwater-induced subsurface ocean warming in regulating the Atlantic meridional overturning in glacial climate simulations
The Community Climate System Model version 3, (CCSM3) is used to investigate the effect of the high latitude North Atlantic subsurface ocean temperature response in idealized freshwater hosing experiments on the strength of the Atlantic meridional overturning circulation (AMOC). The hosing experimen...
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ftncar:oai:drupal-site.org:articles_17457 2023-09-05T13:21:29+02:00 The role of meltwater-induced subsurface ocean warming in regulating the Atlantic meridional overturning in glacial climate simulations Brady, Esther (author) Otto-Bliesner, Bette (author) 2011-10-01 application/pdf http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-001-925 https://doi.org/10.1007/s00382-010-0925-9 en eng Springer Climate Dynamics http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-001-925 doi:10.1007/s00382-010-0925-9 ark:/85065/d7sn0b8j An edited version of this paper was published by Springer. Copyright 2010 Springer-Verlag. Text article 2011 ftncar https://doi.org/10.1007/s00382-010-0925-9 2023-08-14T18:44:44Z The Community Climate System Model version 3, (CCSM3) is used to investigate the effect of the high latitude North Atlantic subsurface ocean temperature response in idealized freshwater hosing experiments on the strength of the Atlantic meridional overturning circulation (AMOC). The hosing experiments covered a range of input magnitudes at two locations in a glacial background state. Subsurface subpolar ocean warms when freshwater is added to the high latitude North Atlantic (NATL cases) and weakly cools when freshwater is added to the Gulf of Mexico (GOM cases). All cases show subsurface ocean warming in the Southern Hemisphere (SH). The sensitivity of the AMOC response to the location and magnitude of hosing is related to the induced subsurface temperature response, which affects the magnitude of the large-scale meridional pressure gradient at depth through the effect on upper ocean density. The high latitude subsurface warming induced in the NATL cases lowers the upper ocean density in the deepwater formation region enhancing a density reduction by local freshening. In the GOM cases the effect of SH warming partially offsets the effect of the high latitude freshening on the meridional density gradient. Following the end of hosing, a brief convective event occurs in the largest NATL cases which flushes some of the heat stored in the subsurface layers. This fuels a rapid rise in AMOC that lasts less than a couple of decades before subsequent freshening from increases in precipitation and sea ice melt reverses the initial increase in the meridional density gradient. Thereafter AMOC recovery slows to the rate found in comparable GOM cases. The result for these glacial transient hosing experiments is that the pace of the longer recovery is not sensitive to location of the imposed freshwater forcing. Article in Journal/Newspaper North Atlantic Sea ice OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Climate Dynamics 37 7-8 1517 1532 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
The Community Climate System Model version 3, (CCSM3) is used to investigate the effect of the high latitude North Atlantic subsurface ocean temperature response in idealized freshwater hosing experiments on the strength of the Atlantic meridional overturning circulation (AMOC). The hosing experiments covered a range of input magnitudes at two locations in a glacial background state. Subsurface subpolar ocean warms when freshwater is added to the high latitude North Atlantic (NATL cases) and weakly cools when freshwater is added to the Gulf of Mexico (GOM cases). All cases show subsurface ocean warming in the Southern Hemisphere (SH). The sensitivity of the AMOC response to the location and magnitude of hosing is related to the induced subsurface temperature response, which affects the magnitude of the large-scale meridional pressure gradient at depth through the effect on upper ocean density. The high latitude subsurface warming induced in the NATL cases lowers the upper ocean density in the deepwater formation region enhancing a density reduction by local freshening. In the GOM cases the effect of SH warming partially offsets the effect of the high latitude freshening on the meridional density gradient. Following the end of hosing, a brief convective event occurs in the largest NATL cases which flushes some of the heat stored in the subsurface layers. This fuels a rapid rise in AMOC that lasts less than a couple of decades before subsequent freshening from increases in precipitation and sea ice melt reverses the initial increase in the meridional density gradient. Thereafter AMOC recovery slows to the rate found in comparable GOM cases. The result for these glacial transient hosing experiments is that the pace of the longer recovery is not sensitive to location of the imposed freshwater forcing. |
author2 |
Brady, Esther (author) Otto-Bliesner, Bette (author) |
format |
Article in Journal/Newspaper |
title |
The role of meltwater-induced subsurface ocean warming in regulating the Atlantic meridional overturning in glacial climate simulations |
spellingShingle |
The role of meltwater-induced subsurface ocean warming in regulating the Atlantic meridional overturning in glacial climate simulations |
title_short |
The role of meltwater-induced subsurface ocean warming in regulating the Atlantic meridional overturning in glacial climate simulations |
title_full |
The role of meltwater-induced subsurface ocean warming in regulating the Atlantic meridional overturning in glacial climate simulations |
title_fullStr |
The role of meltwater-induced subsurface ocean warming in regulating the Atlantic meridional overturning in glacial climate simulations |
title_full_unstemmed |
The role of meltwater-induced subsurface ocean warming in regulating the Atlantic meridional overturning in glacial climate simulations |
title_sort |
role of meltwater-induced subsurface ocean warming in regulating the atlantic meridional overturning in glacial climate simulations |
publisher |
Springer |
publishDate |
2011 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-001-925 https://doi.org/10.1007/s00382-010-0925-9 |
genre |
North Atlantic Sea ice |
genre_facet |
North Atlantic Sea ice |
op_relation |
Climate Dynamics http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-001-925 doi:10.1007/s00382-010-0925-9 ark:/85065/d7sn0b8j |
op_rights |
An edited version of this paper was published by Springer. Copyright 2010 Springer-Verlag. |
op_doi |
https://doi.org/10.1007/s00382-010-0925-9 |
container_title |
Climate Dynamics |
container_volume |
37 |
container_issue |
7-8 |
container_start_page |
1517 |
op_container_end_page |
1532 |
_version_ |
1776202081926905856 |