DOI: 10.1175/JCLI-D-14-00631.1
Scopus记录号: 2-s2.0-84947772738
论文题名: A lagrangian method to isolate the impacts of mixed layer subduction on the meridional overturning circulation in a numerical model
作者: Thomas M.D. ; Tréguier A.-M. ; Blanke B. ; Deshayes J. ; Voldoire A.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 19 起始页码: 7503
结束页码: 7517
语种: 英语
Scopus关键词: Climate models
; Geographical regions
; Heat convection
; Lagrange multipliers
; Numerical methods
; Atlantic meridional overturning circulations
; Climate policy
; General circulation model
; Lagrangian circulation/transport
; Lagrangian methods
; Meridional overturning circulations
; Oceanic mixed layers
; Topographic slope
; Oceanography
; gyre
; Lagrangian analysis
; meridional circulation
; mixed layer
; numerical model
; oceanic convection
; overturn
; Arctic Ocean
; Atlantic Ocean
; Irminger Sea
; Labrador Sea
; Norwegian Sea
; Rockall Basin
英文摘要: Large differences in the Atlantic meridional overturning circulation (AMOC) exhibited between the available ocean models pose problems as to how they can be interpreted for climate policy. A novel Lagrangian methodology has been developed for use with ocean models that enables a decomposition of the AMOC according to its source waters of subduction from themixed layer of different geographical regions. Themethod is described here and used to decompose the AMOC of the Centre National de Recherches Météorologiques (CNRM) ocean model, which is approximately 4.5 Sv (1 Sv 5 106m3 s-1) too weak at 26°N, compared to observations. Contributions from mixed layer subduction to the peakAMOC at 26°N in the model are dominated by the Labrador Sea, which contributes 7.51 Sv; but contributions from the Nordic seas, the Irminger Sea, and the Rockall basin are also important. These waters mostly originate where deep mixed layers border the topographic slopes of the SubpolarGyre andNordic seas. The too-weakmodelAMOC can be explained by weak model representations of the overflow and of Irminger Sea subduction. These are offset by the large Labrador Sea component, which is likely to be too strong as a result of unrealistically distributed and too-deep mixed layers near the shelf. © 2015 American Meteorological Society. 资助项目: NERC, Natural Environment Research Council
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50668
Appears in Collections: 气候变化事实与影响
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作者单位: Laboratoire de Physique des Océans, UMR 6523, CNRS-Ifremer-IRD-UBO, Plouzané, France; Laboratoire de Physique des Océans, UMR 6523, CNRS-Ifremer-IRD-UBO, Brest, France; International Centre for Education, Marine and Atmospheric Sciences over Africa, Department of Oceanography, University of Cape Town, Cape Town, South Africa; CNRM-GAME (Meteo-France, CNRS), Toulouse, France
Recommended Citation:
Thomas M.D.,Tréguier A.-M.,Blanke B.,et al. A lagrangian method to isolate the impacts of mixed layer subduction on the meridional overturning circulation in a numerical model[J]. Journal of Climate,2015-01-01,28(19)