DOI: 10.1175/JCLI-D-15-0007.1
Scopus记录号: 2-s2.0-84947795911
论文题名: Wintertime atmospheric response to North Atlantic ocean circulation variability in a climate model
作者: Frankignoul C. ; Gastineau G. ; Kwon Y.-O.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 19 起始页码: 7659
结束页码: 7677
语种: 英语
Scopus关键词: Atmospheric pressure
; Climate change
; Climate models
; Heat flux
; Ocean currents
; Atlantic meridional overturning circulations
; Atlantic multidecadal oscillations
; Climate variability
; Community climate system model
; Meridional overturning circulations
; North Atlantic Ocean Circulation
; North Atlantic oscillations
; Ocean-atmosphere interactions
; Oceanography
; air-sea interaction
; climate modeling
; North Atlantic Oscillation
; oceanic circulation
; overturn
; sea surface temperature
; Atlantic Ocean
; Atlantic Ocean (North)
; Gulf Stream
英文摘要: Maximum covariance analysis of a preindustrial control simulation of the NCAR Community Climate System Model, version 4 (CCSM4), shows that a barotropic signal in winter broadly resembling a negative phase of the North Atlantic Oscillation (NAO) follows an intensification of the Atlantic meridional overturning circulation (AMOC) by about 7 yr. The delay is due to the cyclonic propagation along the North Atlantic Current (NAC) and the subpolar gyre of a SST warming linked to a northward shift and intensification of the NAC, together with an increasing SST cooling linked to increasing southward advection of subpolar water along the western boundary and a southward shift of the Gulf Stream (GS). These changes result in a meridional SST dipole, which follows the AMOC intensification after 6 or 7 yr. The SST changes were initiated by the strengthening of the western subpolar gyre and by bottom torque at the crossover of the deep branches of the AMOC with the NAC on the western flank of the Mid-Atlantic Ridge and the GS near the Tail of the Grand Banks, respectively. The heat flux damping of the SST dipole shifts the region of maximum atmospheric transient eddy growth southward, leading to a negative NAO-like response. No significant atmospheric response is found to the Atlantic multidecadal oscillation (AMO), which is broadly realistic but shifted south and associated with a much weaker meridional SST gradient than the AMOC fingerprint. Nonetheless, the wintertime atmospheric response to the AMOC shows some similarity with the observed response to the AMO, suggesting that the ocean-atmosphere interactions are broadly realistic in CCSM4. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50738
Appears in Collections: 气候变化事实与影响
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作者单位: Sorbonne Universités, UPMC/CNRS/IRD/MNHN, LOCEAN/IPSL, Paris, France; Woods Hole Oceanographic Institution, Woods Hole, MA, United States
Recommended Citation:
Frankignoul C.,Gastineau G.,Kwon Y.-O.. Wintertime atmospheric response to North Atlantic ocean circulation variability in a climate model[J]. Journal of Climate,2015-01-01,28(19)