DOI: 10.1175/JCLI-D-17-0825.1
Scopus记录号: 2-s2.0-85050184136
论文题名: Can the salt-advection feedback be detected in internal variability of the atlantic meridional overturning circulation?
作者: Cheng W. ; Weijer W. ; Kim W.M. ; Danabasoglu G. ; Yeager S.G. ; Gent P.R. ; Zhang D. ; Chiang J.C.H. ; Zhang J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 16 起始页码: 6649
结束页码: 6667
语种: 英语
英文关键词: Coupled models
; Feedback
; Meridional overturning circulation
; Model output statistics
; Numerical analysis/modeling
; Oceanic variability
Scopus关键词: Advection
; Feedback
; Flow of water
; Water
; Coupled models
; Meridional overturning circulations
; Model output statistics
; Numerical analysis/modeling
; Oceanic variabilities
; Oceanography
; advection
; air-sea interaction
; atmospheric transport
; meridional circulation
; numerical model
; overturn
; perturbation
; salinity
; Atlantic Ocean
; Atlantic Ocean (North)
; Southern Ocean
英文摘要: Evidence for the assumptions of the salt-advection feedback in box models is sought by studying the Atlantic meridional overturning circulation (AMOC) internal variability in the long preindustrial control runs of two Earth system models. The first assumption is that AMOC strength is proportional to the meridional density difference between the North Atlantic and the Southern Oceans. The model simulations support this assumption, with the caveat that nearly all the long time-scale variability occurs in the North Atlantic density. The second assumption is that the freshwater transport variability by the overturning at the Atlantic southern boundary is controlled by the strength of AMOC. Only one of the models shows some evidence that AMOC variability at 45°N leads variability in the overturning freshwater transport at the southern boundary by about 30 years, but the other model shows no such coherence. In contrast, in both models this freshwater transport variability is dominated by local salinity variations. The third assumption is that changes in the overturning freshwater transport at the Atlantic southern boundary perturb the north-south density difference, and thus feed back on AMOC strength in the north. No evidence for this assumption is found in either model at any time scale, although this does not rule out that the salt-advection feedback may be excited by a strong enough freshwater perturbation. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111453
Appears in Collections: 气候减缓与适应
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作者单位: Joint Institute for the Study of Atmosphere and Ocean, University of Washington, Seattle, WA, United States; Pacific Marine Environmental Laboratory, NOAA, Seattle, WA, United States; Los Alamos National Laboratory, Los Alamos, NM, United States; National Center for Atmospheric Research, Boulder, CO, United States; University of California, Berkeley, Berkeley, CA, United States
Recommended Citation:
Cheng W.,Weijer W.,Kim W.M.,et al. Can the salt-advection feedback be detected in internal variability of the atlantic meridional overturning circulation?[J]. Journal of Climate,2018-01-01,31(16)