Southern ocean overturning compensation in an eddy-resolving climate simulation
The Southern Ocean’s Antarctic Circumpolar Current (ACC) and meridional overturning circulation (MOC) response to increasing zonal wind stress is, for the first time, analyzed in a high-resolution (0.1° ocean and 0.25° atmosphere), fully coupled global climate simulation using the Community Earth Sy...
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American Meteorological Society
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ftncar:oai:drupal-site.org:articles_18463 2023-09-05T13:14:05+02:00 Southern ocean overturning compensation in an eddy-resolving climate simulation Bishop, Stuart (author) Gent, Peter (author) Bryan, Frank (author) Thompson, Andrew (author) Long, Matthew (author) Abernathey, Ryan (author) 2016-05-01 application/pdf http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-022-911 https://doi.org/10.1175/JPO-D-15-0177.1 en eng American Meteorological Society Journal of Physical Oceanography articles:18463 ark:/85065/d76m38fg http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-022-911 doi:10.1175/JPO-D-15-0177.1 Copyright 2016 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 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work. Text article 2016 ftncar https://doi.org/10.1175/JPO-D-15-0177.1 2023-08-14T18:43:32Z The Southern Ocean’s Antarctic Circumpolar Current (ACC) and meridional overturning circulation (MOC) response to increasing zonal wind stress is, for the first time, analyzed in a high-resolution (0.1° ocean and 0.25° atmosphere), fully coupled global climate simulation using the Community Earth System Model. Results from a 20-yr wind perturbation experiment, where the Southern Hemisphere zonal wind stress is increased by 50% south of 30°S, show only marginal changes in the mean ACC transport through Drake Passage--an increase of 6% [136-144 Sverdrups (Sv; 1 Sv ≡ 10⁶ m³ s⁻¹)] in the perturbation experiment compared with the control. However, the upper and lower circulation cells of the MOC do change. The lower cell is more affected than the upper cell with a maximum increase of 64% versus 39%, respectively. Changes in the MOC are directly linked to changes in water mass transformation from shifting surface isopycnals and sea ice melt, giving rise to changes in surface buoyancy forcing. The increase in transport of the lower cell leads to upwelling of warm and salty Circumpolar Deep Water and subsequent melting of sea ice surrounding Antarctica. The MOC is commonly supposed to be the sum of two opposing components: a wind- and transient-eddy overturning cell. Here, the transient-eddy overturning is virtually unchanged and consistent with a large-scale cancellation of localized regions of both enhancement and suppression of eddy kinetic energy along the mean path of the ACC. However, decomposing the time-mean overturning into a time- and zonal-mean component and a standing-eddy component reveals partial compensation between wind-driven and standing-eddy components of the circulation. Article in Journal/Newspaper Antarc* Antarctic Antarctica Drake Passage Sea ice Southern Ocean OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Antarctic Southern Ocean Drake Passage Journal of Physical Oceanography 46 5 1575 1592 |
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 Southern Ocean’s Antarctic Circumpolar Current (ACC) and meridional overturning circulation (MOC) response to increasing zonal wind stress is, for the first time, analyzed in a high-resolution (0.1° ocean and 0.25° atmosphere), fully coupled global climate simulation using the Community Earth System Model. Results from a 20-yr wind perturbation experiment, where the Southern Hemisphere zonal wind stress is increased by 50% south of 30°S, show only marginal changes in the mean ACC transport through Drake Passage--an increase of 6% [136-144 Sverdrups (Sv; 1 Sv ≡ 10⁶ m³ s⁻¹)] in the perturbation experiment compared with the control. However, the upper and lower circulation cells of the MOC do change. The lower cell is more affected than the upper cell with a maximum increase of 64% versus 39%, respectively. Changes in the MOC are directly linked to changes in water mass transformation from shifting surface isopycnals and sea ice melt, giving rise to changes in surface buoyancy forcing. The increase in transport of the lower cell leads to upwelling of warm and salty Circumpolar Deep Water and subsequent melting of sea ice surrounding Antarctica. The MOC is commonly supposed to be the sum of two opposing components: a wind- and transient-eddy overturning cell. Here, the transient-eddy overturning is virtually unchanged and consistent with a large-scale cancellation of localized regions of both enhancement and suppression of eddy kinetic energy along the mean path of the ACC. However, decomposing the time-mean overturning into a time- and zonal-mean component and a standing-eddy component reveals partial compensation between wind-driven and standing-eddy components of the circulation. |
author2 |
Bishop, Stuart (author) Gent, Peter (author) Bryan, Frank (author) Thompson, Andrew (author) Long, Matthew (author) Abernathey, Ryan (author) |
format |
Article in Journal/Newspaper |
title |
Southern ocean overturning compensation in an eddy-resolving climate simulation |
spellingShingle |
Southern ocean overturning compensation in an eddy-resolving climate simulation |
title_short |
Southern ocean overturning compensation in an eddy-resolving climate simulation |
title_full |
Southern ocean overturning compensation in an eddy-resolving climate simulation |
title_fullStr |
Southern ocean overturning compensation in an eddy-resolving climate simulation |
title_full_unstemmed |
Southern ocean overturning compensation in an eddy-resolving climate simulation |
title_sort |
southern ocean overturning compensation in an eddy-resolving climate simulation |
publisher |
American Meteorological Society |
publishDate |
2016 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-022-911 https://doi.org/10.1175/JPO-D-15-0177.1 |
geographic |
Antarctic Southern Ocean Drake Passage |
geographic_facet |
Antarctic Southern Ocean Drake Passage |
genre |
Antarc* Antarctic Antarctica Drake Passage Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Drake Passage Sea ice Southern Ocean |
op_relation |
Journal of Physical Oceanography articles:18463 ark:/85065/d76m38fg http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-022-911 doi:10.1175/JPO-D-15-0177.1 |
op_rights |
Copyright 2016 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 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work. |
op_doi |
https://doi.org/10.1175/JPO-D-15-0177.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
46 |
container_issue |
5 |
container_start_page |
1575 |
op_container_end_page |
1592 |
_version_ |
1776205148792553472 |