DOI: 10.1175/JCLI-D-12-00358.1
Scopus记录号: 2-s2.0-84881651992
论文题名: Ocean basin geometry and the salinification of the atlantic ocean
作者: Nilsson J. ; Langen P.L. ; Ferreira D. ; Marshall J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 16 起始页码: 6163
结束页码: 6184
语种: 英语
Scopus关键词: Asymmetric state
; Deep-water formation
; Ice-ocean models
; Northern Hemispheres
; Ocean circulation
; Southern Hemisphere
; Western boundary
; Zonal asymmetry
; Climate models
; Experiments
; Geophysics
; Sea ice
; Oceanography
; air-sea interaction
; atmosphere-ice-ocean system
; atmospheric circulation
; geometry
; ocean basin
; oceanic circulation
; Southern Hemisphere
; Sverdrup transport
; wind-driven circulation
; Atlantic Ocean
; Pacific Ocean
英文摘要: A coupled atmosphere-sea ice-ocean model is used in an aqua-planet setting to examine the role of the basin geometry for the climate and ocean circulation. The basin geometry has a present-day-like topology with two idealized northern basins and a circumpolar ocean in the south.Asuite of experiments is described in which the southward extents of the two (gridpoint wide) "continents" and the basin widths have been varied. When the two basins have identical shapes, the coupled model can attain a symmetric climate state with northern deep-water formation in both basins as well as asymmetric states, where the deep-water formation occurs only in one of the basins and Atlantic-Pacific-like hydrographic differences develop. A difference in the southward extents of the land barriers can enhance as well as reduce the zonal asymmetries of the atmosphere-ocean circulation. This arises from an interplay between the basin boundaries and the winddriven Sverdrup circulation, which controls the interbasin exchange of heat and salt. Remarkably, when the short "African" continent is located near or equatorward of the zero wind line in the Southern Hemisphere, the deep-water formation becomes uniquely localized to the "Atlantic"-like basin with the long western boundary. In this case, the salinification is accomplished primarily by a westward wind-routed interbasin salt transport. Furthermore, experiments using geometries with asymmetries in both continental extents and basin widths suggest that in the World Ocean these two fundamental basin asymmetries should independently be strong enough for uniquely localizing the Northern Hemisphere deep-water formation to the Atlantic Ocean. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51763
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Meteorology, Bert Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Danish Climate Centre, Danish Meteorological Institute, Copenhagen, Denmark; Department of Earth, Atmospheric and Planetary Science, Massachusetts Institute of Technology, Cambridge, MA, United States
Recommended Citation:
Nilsson J.,Langen P.L.,Ferreira D.,et al. Ocean basin geometry and the salinification of the atlantic ocean[J]. Journal of Climate,2013-01-01,26(16)