Interhemispheric asymmetry in transient global warming: The role of Drake Passage
in response to increasing greenhouse gases, and observations show that this trend has already begun to occur. This interhemispheric asymmetry has largely been attributed to land-ocean differences between the hemispheres and Arctic sea ice melt, while the role of ocean currents in setting this asymme...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.684.1967 2023-05-15T13:39:33+02:00 Interhemispheric asymmetry in transient global warming: The role of Drake Passage David K. Hutchinson Matthew H. Engl Agus Santoso Andrew Mcc Hogg The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.684.1967 http://web.science.unsw.edu.au/%7Ematthew/HESH-global-warming-DP-effect-GRL.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.684.1967 http://web.science.unsw.edu.au/%7Ematthew/HESH-global-warming-DP-effect-GRL.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://web.science.unsw.edu.au/%7Ematthew/HESH-global-warming-DP-effect-GRL.pdf text ftciteseerx 2016-01-08T18:02:25Z in response to increasing greenhouse gases, and observations show that this trend has already begun to occur. This interhemispheric asymmetry has largely been attributed to land-ocean differences between the hemispheres and Arctic sea ice melt, while the role of ocean currents in setting this asymmetry is less well understood. This study isolates the impact of an open Southern Ocean gateway upon the interhemispheric asymmetry in transient global warming by forcing a fully coupled climate model with an increasing CO2 scenario with and without a land bridge across Drake Passage (DP). It is found that over the transient warming period, the NH-SH surface warming asymmetry is reduced in the DP closed case, by approximately 41% for sea surface temperature and approximately 6 % for surface air temperature. In the DP open case, sea ice extent is far greater in the SH than in the DP closed case, whereas the sea ice response to warming in the NH is insensitive to whether or not DP is closed. These results illustrate that part of the interhemispheric asymmetry in surface warming is due to the Antarctic Circumpolar Current (ACC) thermally isolating Antarctica. The ACC limits ocean heat transport across the DP latitudes and allows a much greater coverage of sea ice in the Southern Ocean than would be the case in the absence of a circumpolar ocean. Text Antarc* Antarctic Antarctica Arctic Drake Passage Global warming Sea ice Southern Ocean Unknown Antarctic Arctic Drake Passage Southern Ocean The Antarctic |
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description |
in response to increasing greenhouse gases, and observations show that this trend has already begun to occur. This interhemispheric asymmetry has largely been attributed to land-ocean differences between the hemispheres and Arctic sea ice melt, while the role of ocean currents in setting this asymmetry is less well understood. This study isolates the impact of an open Southern Ocean gateway upon the interhemispheric asymmetry in transient global warming by forcing a fully coupled climate model with an increasing CO2 scenario with and without a land bridge across Drake Passage (DP). It is found that over the transient warming period, the NH-SH surface warming asymmetry is reduced in the DP closed case, by approximately 41% for sea surface temperature and approximately 6 % for surface air temperature. In the DP open case, sea ice extent is far greater in the SH than in the DP closed case, whereas the sea ice response to warming in the NH is insensitive to whether or not DP is closed. These results illustrate that part of the interhemispheric asymmetry in surface warming is due to the Antarctic Circumpolar Current (ACC) thermally isolating Antarctica. The ACC limits ocean heat transport across the DP latitudes and allows a much greater coverage of sea ice in the Southern Ocean than would be the case in the absence of a circumpolar ocean. |
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The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
David K. Hutchinson Matthew H. Engl Agus Santoso Andrew Mcc Hogg |
spellingShingle |
David K. Hutchinson Matthew H. Engl Agus Santoso Andrew Mcc Hogg Interhemispheric asymmetry in transient global warming: The role of Drake Passage |
author_facet |
David K. Hutchinson Matthew H. Engl Agus Santoso Andrew Mcc Hogg |
author_sort |
David K. Hutchinson |
title |
Interhemispheric asymmetry in transient global warming: The role of Drake Passage |
title_short |
Interhemispheric asymmetry in transient global warming: The role of Drake Passage |
title_full |
Interhemispheric asymmetry in transient global warming: The role of Drake Passage |
title_fullStr |
Interhemispheric asymmetry in transient global warming: The role of Drake Passage |
title_full_unstemmed |
Interhemispheric asymmetry in transient global warming: The role of Drake Passage |
title_sort |
interhemispheric asymmetry in transient global warming: the role of drake passage |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.684.1967 http://web.science.unsw.edu.au/%7Ematthew/HESH-global-warming-DP-effect-GRL.pdf |
geographic |
Antarctic Arctic Drake Passage Southern Ocean The Antarctic |
geographic_facet |
Antarctic Arctic Drake Passage Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica Arctic Drake Passage Global warming Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Arctic Drake Passage Global warming Sea ice Southern Ocean |
op_source |
http://web.science.unsw.edu.au/%7Ematthew/HESH-global-warming-DP-effect-GRL.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.684.1967 http://web.science.unsw.edu.au/%7Ematthew/HESH-global-warming-DP-effect-GRL.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766120226150154240 |