A model of the upper branch of the meridional overturning of the southern ocean

被引：42
|
作者：
Marshall, John [1 ]
Radko, Timour [1 ]
机构：
[1] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA
来源：
PROGRESS IN OCEANOGRAPHY | 2006年 / 70卷 / 2-4期
基金：
美国国家科学基金会;
关键词：
meridional overturning circulation; Antarctic Circumpolar Current; Southern ocean;
D O I：
10.1016/j.pocean.2006.07.004
中图分类号：
P7 [海洋学];
学科分类号：
0707 ;
摘要：
A zonal-average model of the upper branch of the meridional overturning circulation of the southern ocean is constructed and used to discuss the processes - wind, buoyancy, eddy forcing and boundary conditions - that control its strength and sense of circulation. The geometry of the thermocline 'wedge', set by the mapping between the vertical spacing of buoyancy surfaces (the stratification) on the equatorial flank of the Antarctic Circumpolar Current and their outcrop at the sea surface, is seen to play a central role by setting the interior large-scale potential vorticity distribution. It is shown that the action of eddies mixing this potential vorticity field induces a residual flow in the meridional plane much as is observed, with upwelling of fluid around Antarctica, northward surface flow and subduction to form intermediate water. Along with this overturning circulation there is a concomitant air-sea buoyancy flux directed in to the ocean. (C) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码：331 / 345
页数：15
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