DOI: 10.1007/s00382-015-2953-y
Scopus记录号: 2-s2.0-84951823251
论文题名: Active AMOC–NAO coupling in the IPSL-CM5A-MR climate model
作者: Wen N. ; Frankignoul C. ; Gastineau G.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 47, 期: 2017-07-08 起始页码: 2105
结束页码: 2119
语种: 英语
英文关键词: Air–sea interaction
; AMOC
; Atlantic multi-decadal variability
; Climate models
; NAO
英文摘要: The atmospheric response to the AMOC variability is investigated in the IPSL-CM5A medium resolution climate model, using lagged maximum covariance analysis (MCA) of a control simulation. A robust atmospheric response is detected in winter, with a negative NAO-like response following by about 9-year an AMOC intensification in the North Atlantic, with a pattern broadly resembling the second mode of AMOC variability. The response is established through the SST footprint of the AMOC and the associated surface heat flux damping, with a dipole of SST anomalies made of cold SST in the Gulf Stream region and warm SST further northeast around the North Atlantic Current. The dipole SST anomaly pattern evolves synchronously with the AMOC changes at its dominant 20-year period, so that the lagged NAO-like response detected by MCA actually reflects the near-synchronous AMOC influence on the atmosphere, which is masked at short time lag by the stronger atmospheric forcing of the AMOC. The atmospheric response to an intensification of the AMOC is thus a positive NAO-like pattern, together with an anomalous low pressure over the Aleutians, opposite to that detected at 9-year lag by the MCA. Since the NAO also contributes to force the AMOC, there is a positive feedback between AMOC and NAO in the model, with the atmospheric feedback strength about 1/4 of that of the atmospheric forcing, which enhances the low frequency variability of AMOC. This is further confirmed by the lead-lag relation between the dominant mode of ocean and atmosphere, and by the robust 20-year period of the NAO. © 2015, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53527
Appears in Collections: 过去全球变化的重建
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作者单位: Key Laboratory of Meteorological Disaster of Ministry of Education and College of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing, China; CNRS/IRD/MNHN, LOCEAN/IPSL, Sorbonne Universités (UPMC, Univ. Paris 06), Paris, France
Recommended Citation:
Wen N.,Frankignoul C.,Gastineau G.. Active AMOC–NAO coupling in the IPSL-CM5A-MR climate model[J]. Climate Dynamics,2016-01-01,47(2017-07-08)