On the Climatic Impact of Ocean Circulation
Integrations of coupled climate models with mixed-layer and fixed-current ocean components are used to explore the climatic response to varying magnitudes of ocean circulation. Four mixed-layer ocean experiments without ocean heat transports are performed using two different atmosphere–land componen...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.140.5973 2023-05-15T18:17:01+02:00 On the Climatic Impact of Ocean Circulation Michael Winton The Pennsylvania State University CiteSeerX Archives 2002 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.140.5973 http://www.gfdl.noaa.gov/reference/bibliography/2003/mw0301.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.140.5973 http://www.gfdl.noaa.gov/reference/bibliography/2003/mw0301.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.gfdl.noaa.gov/reference/bibliography/2003/mw0301.pdf text 2002 ftciteseerx 2016-01-07T14:56:01Z Integrations of coupled climate models with mixed-layer and fixed-current ocean components are used to explore the climatic response to varying magnitudes of ocean circulation. Four mixed-layer ocean experiments without ocean heat transports are performed using two different atmosphere–land components—the new GFDL AM2 and the GFDL Manabe Climate Model (MCM)—and two different sea ice components, one dynamic and one thermodynamic. Both experiments employing the dynamic sea ice component develop unstable growth of sea ice while the experiments with a thermodynamic sea ice component develop very large but stable ice covers. The global cooling ranges from modest to extreme in the four experiments. Using the fixed-current climate model, a trio of 100-yr integrations are made with control currents from a GFDL R30 ocean simulation, same currents reduced by 50%, and same currents increased by 50%. This suite is performed with two coupled models again employing the two atmosphere–land components, AM2 and MCM, for a total of six experiments. Both models show a large sensitivity of the sea ice extent to the magnitude of currents with increased currents reducing the extent and warming the high latitudes. Low cloud cover also responds to circulation changes in both models but in the opposite sense. In the AM2-based model, low cloudiness decreases as ocean circulation increases, reinforcing the sea ice changes in reducing the planetary reflectivity, and warming the climate. This cloudiness change is associated with a reduction in lower-atmospheric stability over the ocean. Because the AM2-based model is able to simulate the observed seasonal low cloud–stability relationship and the changes in these quantities with altered ocean circulation are consistent with this relationship, the AM2 interpretation of the cloud changes is favored. 1. Text Sea ice Unknown |
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Integrations of coupled climate models with mixed-layer and fixed-current ocean components are used to explore the climatic response to varying magnitudes of ocean circulation. Four mixed-layer ocean experiments without ocean heat transports are performed using two different atmosphere–land components—the new GFDL AM2 and the GFDL Manabe Climate Model (MCM)—and two different sea ice components, one dynamic and one thermodynamic. Both experiments employing the dynamic sea ice component develop unstable growth of sea ice while the experiments with a thermodynamic sea ice component develop very large but stable ice covers. The global cooling ranges from modest to extreme in the four experiments. Using the fixed-current climate model, a trio of 100-yr integrations are made with control currents from a GFDL R30 ocean simulation, same currents reduced by 50%, and same currents increased by 50%. This suite is performed with two coupled models again employing the two atmosphere–land components, AM2 and MCM, for a total of six experiments. Both models show a large sensitivity of the sea ice extent to the magnitude of currents with increased currents reducing the extent and warming the high latitudes. Low cloud cover also responds to circulation changes in both models but in the opposite sense. In the AM2-based model, low cloudiness decreases as ocean circulation increases, reinforcing the sea ice changes in reducing the planetary reflectivity, and warming the climate. This cloudiness change is associated with a reduction in lower-atmospheric stability over the ocean. Because the AM2-based model is able to simulate the observed seasonal low cloud–stability relationship and the changes in these quantities with altered ocean circulation are consistent with this relationship, the AM2 interpretation of the cloud changes is favored. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Michael Winton |
spellingShingle |
Michael Winton On the Climatic Impact of Ocean Circulation |
author_facet |
Michael Winton |
author_sort |
Michael Winton |
title |
On the Climatic Impact of Ocean Circulation |
title_short |
On the Climatic Impact of Ocean Circulation |
title_full |
On the Climatic Impact of Ocean Circulation |
title_fullStr |
On the Climatic Impact of Ocean Circulation |
title_full_unstemmed |
On the Climatic Impact of Ocean Circulation |
title_sort |
on the climatic impact of ocean circulation |
publishDate |
2002 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.140.5973 http://www.gfdl.noaa.gov/reference/bibliography/2003/mw0301.pdf |
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Sea ice |
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Sea ice |
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http://www.gfdl.noaa.gov/reference/bibliography/2003/mw0301.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.140.5973 http://www.gfdl.noaa.gov/reference/bibliography/2003/mw0301.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766191015154155520 |