Southern ocean deep circulation and heat uptake in a high-resolution climate model
The dynamics of the lower cell of the meridional overturning circulation (MOC) in the Southern Ocean are compared in two versions of a global climate model: one with high-resolution (0.1°) ocean and sea ice and the other a lower-resolution (1.0°) counterpart. In the high-resolution version, the lowe...
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American Meteorological Society
2016
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ftncar:oai:drupal-site.org:articles_18354 2023-09-05T13:12:17+02:00 Southern ocean deep circulation and heat uptake in a high-resolution climate model Newsom, Emily (author) Bitz, Cecilia (author) Bryan, Frank (author) Abernathey, Ryan (author) Gent, Peter (author) 2016-04-01 application/pdf http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-022-790 https://doi.org/10.1175/JCLI-D-15-0513.1 en eng American Meteorological Society Journal of Climate articles:18354 ark:/85065/d7mp54vc http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-022-790 doi:10.1175/JCLI-D-15-0513.1 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/JCLI-D-15-0513.1 2023-08-14T18:43:23Z The dynamics of the lower cell of the meridional overturning circulation (MOC) in the Southern Ocean are compared in two versions of a global climate model: one with high-resolution (0.1°) ocean and sea ice and the other a lower-resolution (1.0°) counterpart. In the high-resolution version, the lower cell circulation is stronger and extends farther northward into the abyssal ocean. Using the water-mass-transformation framework, it is shown that the differences in the lower cell circulation between resolutions are explained by greater rates of surface water-mass transformation within the higher-resolution Antarctic sea ice pack and by differences in diapycnal-mixing-induced transformation in the abyssal ocean. While both surface and interior transformation processes work in tandem to sustain the lower cell in the control climate, the circulation is far more sensitive to changes in surface transformation in response to atmospheric warming from raising carbon dioxide levels. The substantial reduction in overturning is primarily attributed to reduced surface heat loss. At high resolution, the circulation slows more dramatically, with an anomaly that reaches deeper into the abyssal ocean and alters the distribution of Southern Ocean warming. The resolution dependence of associated heat uptake is particularly pronounced in the abyssal ocean (below 4000 m), where the higher-resolution version of the model warms 4.5 times more than its lower-resolution counterpart. Article in Journal/Newspaper Antarc* Antarctic ice pack Sea ice Southern Ocean OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Antarctic Southern Ocean Journal of Climate 29 7 2597 2619 |
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 dynamics of the lower cell of the meridional overturning circulation (MOC) in the Southern Ocean are compared in two versions of a global climate model: one with high-resolution (0.1°) ocean and sea ice and the other a lower-resolution (1.0°) counterpart. In the high-resolution version, the lower cell circulation is stronger and extends farther northward into the abyssal ocean. Using the water-mass-transformation framework, it is shown that the differences in the lower cell circulation between resolutions are explained by greater rates of surface water-mass transformation within the higher-resolution Antarctic sea ice pack and by differences in diapycnal-mixing-induced transformation in the abyssal ocean. While both surface and interior transformation processes work in tandem to sustain the lower cell in the control climate, the circulation is far more sensitive to changes in surface transformation in response to atmospheric warming from raising carbon dioxide levels. The substantial reduction in overturning is primarily attributed to reduced surface heat loss. At high resolution, the circulation slows more dramatically, with an anomaly that reaches deeper into the abyssal ocean and alters the distribution of Southern Ocean warming. The resolution dependence of associated heat uptake is particularly pronounced in the abyssal ocean (below 4000 m), where the higher-resolution version of the model warms 4.5 times more than its lower-resolution counterpart. |
author2 |
Newsom, Emily (author) Bitz, Cecilia (author) Bryan, Frank (author) Abernathey, Ryan (author) Gent, Peter (author) |
format |
Article in Journal/Newspaper |
title |
Southern ocean deep circulation and heat uptake in a high-resolution climate model |
spellingShingle |
Southern ocean deep circulation and heat uptake in a high-resolution climate model |
title_short |
Southern ocean deep circulation and heat uptake in a high-resolution climate model |
title_full |
Southern ocean deep circulation and heat uptake in a high-resolution climate model |
title_fullStr |
Southern ocean deep circulation and heat uptake in a high-resolution climate model |
title_full_unstemmed |
Southern ocean deep circulation and heat uptake in a high-resolution climate model |
title_sort |
southern ocean deep circulation and heat uptake in a high-resolution climate model |
publisher |
American Meteorological Society |
publishDate |
2016 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-022-790 https://doi.org/10.1175/JCLI-D-15-0513.1 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic ice pack Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic ice pack Sea ice Southern Ocean |
op_relation |
Journal of Climate articles:18354 ark:/85065/d7mp54vc http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-022-790 doi:10.1175/JCLI-D-15-0513.1 |
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/JCLI-D-15-0513.1 |
container_title |
Journal of Climate |
container_volume |
29 |
container_issue |
7 |
container_start_page |
2597 |
op_container_end_page |
2619 |
_version_ |
1776199646102683648 |