DOI: 10.1002/grl.50183
论文题名: Implications of Arctic sea ice changes for North Atlantic deep convection and the meridional overturning circulation in CCSM4-CMIP5 simulations
作者: Jahn A. ; Holland M.M.
刊名: Geophysical Research Letters
ISSN: 0094-9231
EISSN: 1944-8962
出版年: 2013
卷: 40, 期: 6 起始页码: 1206
结束页码: 1211
语种: 英语
英文关键词: Arctic
; CMIP5
; deep convection
; freshwater
; meriodional overturning circulation (MOC)
; sea ice
Scopus关键词: Arctic
; CMIP5
; Deep convection
; freshwater
; Overturning circulation
; Carbon dioxide
; Climate models
; International trade
; Sea ice
; Water
; Natural convection
; air-sea interaction
; atmospheric forcing
; freshwater environment
; ice cover
; meridional circulation
; numerical model
; oceanic convection
; sea ice
; Arctic Ocean
; Atlantic Ocean
; Labrador Sea
英文摘要: Using CCSM4 climate simulations for 1850-2300 with four different future forcing scenarios, we show that the maximum strength of the Atlantic meridional overturning circulation (MOC) decreases proportionally to the applied CO 2 forcing. This weakening of the overturning is caused by a reduction or shut down of North Atlantic (NA) deep convection due to a surface freshening. In the Labrador Sea, the surface freshening is caused by strongly increased liquid freshwater exports from the Arctic, which are largely due to the decrease in the Arctic sea ice cover. In the strongest forcing scenario (RCP8.5), the Arctic becomes summer ice-free by the end of the 21st century and year-round ice-free by the end of the 23rd century. As a result of the associated freshening, all NA deep convection ceases by 2145, which leads to a 72% (18 Sv) decrease of the MOC strength by the end of the simulation in 2300. Key Points Deep convection in the North Atlantic ceases by 2145 in RCP8.5 The deep convection stops due an increase in the Arctic freshwater export The deep convection shuts down abruptly, but the MOC shows no abrupt changes. ©2013 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876182182&doi=10.1002%2fgrl.50183&partnerID=40&md5=13f4c79fd95f00a773552859264fbf68
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6495
Appears in Collections: 气候减缓与适应
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作者单位: National Center for Atmospheric Research, 1850 Table MesaDrive, Boulder, CO 80305, United States
Recommended Citation:
Jahn A.,Holland M.M.. Implications of Arctic sea ice changes for North Atlantic deep convection and the meridional overturning circulation in CCSM4-CMIP5 simulations[J]. Geophysical Research Letters,2013-01-01,40(6).