DOI: 10.1002/grl.50341
论文题名: Interhemispheric asymmetry in transient global warming: The role of Drake Passage
作者: Hutchinson D.K. ; England M.H. ; Santoso A. ; Hogg A.M.
刊名: Geophysical Research Letters
ISSN: 0094-9155
EISSN: 1944-8886
出版年: 2013
卷: 40, 期: 8 起始页码: 1587
结束页码: 1593
语种: 英语
英文关键词: Antarctic Circumpolar Current
; asymmetry
; global Warming
; sea surface temperature
Scopus关键词: Antarctic circumpolar current
; Antarctic Circumpolar Currents
; asymmetry
; Northern hemisphere
; Ocean heat transport
; Sea surface temperature (SST)
; Southern Hemisphere
; Surface air temperatures
; Carbon dioxide
; Climate models
; Global warming
; Greenhouse gases
; Ocean currents
; Sea ice
; Atmospheric temperature
; Antarctic Circumpolar Wave
; carbon dioxide
; climate forcing
; climate modeling
; global warming
; heat transfer
; land bridge
; land-sea interaction
; melting
; sea ice
; sea surface temperature
; Arctic Ocean
; Drake Passage
英文摘要: Climate models predict that the Northern Hemisphere (NH) will warm faster than the Southern Hemisphere (SH) 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. Key Points The ACC causes part of the interhemispheric asymmetry in global warming This asymmetry is greater in sea surface temperature than air temperature The ACC enables a much greater sea ice extent in the Southern Ocean. ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84877941455&doi=10.1002%2fgrl.50341&partnerID=40&md5=7586e80f7e055b1196d22486a3cbc181
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6419
Appears in Collections: 气候减缓与适应
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作者单位: Climate Change Research Center, Mathews Building, University of New South Wales, Sydney 2052, NSW, Australia
Recommended Citation:
Hutchinson D.K.,England M.H.,Santoso A.,et al. Interhemispheric asymmetry in transient global warming: The role of Drake Passage[J]. Geophysical Research Letters,2013-01-01,40(8).