DOI: 10.1007/s00382-014-2165-x
Scopus记录号: 2-s2.0-84939889505
论文题名: AMOC response to global warming: dependence on the background climate and response timescale
作者: Zhu J. ; Liu Z. ; Zhang J. ; Liu W.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 44, 期: 2017-11-12 起始页码: 3449
结束页码: 3468
语种: 英语
英文关键词: Atlantic meridional overturning circulation
; Carbon dioxide
; Last glacial maximum
; Sea ice
; Timescale
英文摘要: This paper investigates the response of the Atlantic meridional overturning circulation (AMOC) to a sudden doubling of atmospheric CO2 in the National Center for Atmospheric Research Community Climate System Model version 3, with a focus on differences under different background climates. The findings reveal that the evolution of the AMOC differs significantly between the modern climate and the last glacial maximum (LGM). In the modern climate, the AMOC decreases (by 25 %, 4 Sv) in the first 100 years and then recovers slowly (by 6 %, 1 Sv) by the end of the 1,500-year simulation. At the LGM, the AMOC also weakens (by 8 %, 1 Sv) in the initial 90 years, but then recovers, first rapidly (by 30 %, 4 Sv) over the following 300 years, and then slowly (by 13 %, 1.6 Sv) during the remainder of the integration. These results suggest that the responses of the AMOC under both climates have a similar initial rapid weakening period of ~100 years and a final slow strengthening period over 1,000 years long. However, additional intermediate period of ~300 years does occur for the LGM, with rapid intensification in the AMOC. Analyses suggest that the rapid intensification is triggered and sustained primarily by a coupled sea ice–ocean feedback: the reduction of meltwater flux in the northern North Atlantic—associated with the remarkable sea-ice retreat at the LGM—intensifies the AMOC and northward heat transport, which, in turn, causes further sea-ice retreat and more reduction of meltwater. These processes are insignificant under modern conditions. © 2014, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54120
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Department of Atmospheric and Oceanic Sciences and Center for Climatic Research, University of Wisconsin-Madison, 1225 W. Dayton St., Madison, WI, United States; Laboratory for Climate and Ocean-Atmosphere Studies, School of Physics, Peking University, Beijing, China; Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States
Recommended Citation:
Zhu J.,Liu Z.,Zhang J.,et al. AMOC response to global warming: dependence on the background climate and response timescale[J]. Climate Dynamics,2015-01-01,44(2017-11-12)