DOI: 10.1007/s00382-016-2975-0
Scopus记录号: 2-s2.0-84988663592
论文题名: Stable AMOC off state in an eddy-permitting coupled climate model
作者: Mecking J.V. ; Drijfhout S.S. ; Jackson L.C. ; Graham T.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 47, 期: 2017-07-08 起始页码: 2455
结束页码: 2470
语种: 英语
英文关键词: Abrupt climate change
; AMOC
; AMOC collapse
; CGCM
; Eddy-permitting
; Hosing experiment
英文摘要: Shifts between on and off states of the Atlantic Meridional Overturning Circulation (AMOC) have been associated with past abrupt climate change, supported by the bistability of the AMOC found in many older, coarser resolution, ocean and climate models. However, as coupled climate models evolved in complexity a stable AMOC off state no longer seemed supported. Here we show that a current-generation, eddy-permitting climate model has an AMOC off state that remains stable for the 450-year duration of the model integration. Ocean eddies modify the overall freshwater balance, allowing for stronger northward salt transport by the AMOC compared with previous, non eddy-permitting models. As a result, the salinification of the subtropical North Atlantic, due to a southward shift of the intertropical rain belt, is counteracted by the reduced salt transport of the collapsed AMOC. The reduced salinification of the subtropical North Atlantic allows for an anomalous northward freshwater transport into the subpolar North Atlantic dominated by the gyre component. Combining the anomalous northward freshwater transport with the freshening due to reduced evaporation in this region helps stabilise the AMOC off state. © 2016, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53504
Appears in Collections: 过去全球变化的重建
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作者单位: Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Southampton, United Kingdom; Met Office, Hadley Centre, Fitzroy Road, Exeter, United Kingdom
Recommended Citation:
Mecking J.V.,Drijfhout S.S.,Jackson L.C.,et al. Stable AMOC off state in an eddy-permitting coupled climate model[J]. Climate Dynamics,2016-01-01,47(2017-07-08)