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Sverdrup balance
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Sverdrup balance : ウィキペディア英語版
Sverdrup balance
The Sverdrup balance, or Sverdrup relation, is a theoretical relationship between the wind stress exerted on the surface of the open ocean and the vertically integrated meridional (north-south) transport of ocean water.
== History ==

Aside from the oscillatory motions associated with tidal flow, there are two primary causes of large scale flow in the ocean: ''(1)'' thermohaline processes, which induce motion by introducing changes at the surface in temperature and salinity, and therefore in seawater density, and ''(2)'' wind forcing. In the 1940s, when Harald Sverdrup was thinking about calculating the gross features of ocean circulation, he chose to consider exclusively the wind stress component of the forcing. As he says in his 1947 paper, in which he presented the Sverdrup relation, this is probably the more important of the two. After making the assumption that frictional dissipation is negligible, Sverdrup obtained the simple result that the meridional mass transport (the ''Sverdrup transport'') is proportional to the curl of the wind stress. This is known as the Sverdrup relation;
:V =\hat}.
Here,
:\beta is the rate of change of the Coriolis parameter, ''f'', with meridional distance;
:''V'' is the vertically integrated meridional mass transport;
:k is the unit vector in the ''z'' (vertical) direction;
:\tau is the wind stress vector.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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