DOI: 10.1175/JCLI-D-12-00700.1
Scopus记录号: 2-s2.0-84899077147
论文题名: CMIP5 model intercomparison of freshwater budget and circulation in the North Atlantic
作者: Deshayes J. ; Curry R. ; Msadek R.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 9 起始页码: 3298
结束页码: 3317
语种: 英语
Scopus关键词: Budget control
; Oceanography
; Water
; Circulation changes
; Coupled Model Intercomparison Project
; Cross-spectral analysis
; Different time scale
; Freshwater contents
; Meridional circulation
; Model inter comparisons
; Subpolar North Atlantic
; Climate models
; air-sea interaction
; climate modeling
; computer simulation
; gyre
; meridional circulation
; oceanic circulation
; water budget
; Atlantic Ocean
; Atlantic Ocean (North)
英文摘要: The subpolar North Atlantic is a center of variability of ocean properties, wind stress curl, and air-sea exchanges. Observations and hindcast simulations suggest that from the early 1970s to the mid-1990s the subpolar gyre became fresher while the gyre and meridional circulations intensified. This is opposite to the relationship of freshening causing a weakened circulation, most often reproduced by climate models. The authors hypothesize that both these configurations exist but dominate on different time scales: a fresher subpolar gyre when the circulation is more intense, at interannual frequencies (configuration A), and a saltier subpolar gyre when the circulation is more intense, at longer periods (configuration B). Rather than going into the detail of the mechanisms sustaining each configuration, the authors' objective is to identify which configuration dominates and to test whether this depends on frequency, in preindustrial control runs of five climate models from phase 5 of the Coupled Model Intercomparison Project (CMIP5). To this end, the authors have developed a novel intercomparison method that enables analysis of freshwater budget and circulation changes in a physical perspective that overcomes model specificities. Lag correlations and a crossspectral analysis between freshwater content changes and circulation indices validate the authors' hypothesis, as configuration A is only visible at interannual frequencies while configuration B is mostly visible at decadal and longer periods, suggesting that the driving role of salinity on the circulation depends on frequency. Overall, this analysis underscores the large differences among state-of-the-art climate models in their representations of the North Atlantic freshwater budget. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51185
Appears in Collections: 气候变化事实与影响
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作者单位: ICEMASA, University of Cape Town, Cape Town, South Africa; Laboratoire de Physique des Oćeans, CNRS IRD IFREMER UBO, Plouzané, France; Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Geophysical Fluid Dynamics Laboratory, National Oceanic and Atmospheric Administration, Princeton, NJ, United States
Recommended Citation:
Deshayes J.,Curry R.,Msadek R.. CMIP5 model intercomparison of freshwater budget and circulation in the North Atlantic[J]. Journal of Climate,2014-01-01,27(9)