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The thermohaline circulation is caused by differences in ocean waters [Select] and [Select l in contrast to the surface [Sel
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Thermohaline circulation is caused by differences in ocean water,s temperature and Salinity...

The cgange is salinity is also drivrn by the changes in temperature which together means a change in density, so the dense and cold waters sink in the polar regions and then upwelling takes place in different regions.

In contrast the ocean surface circulation is driven by coriolis force or coriolis effect which deflects every northward moving objects towards right in the northern hemisphere and vice verca in the southern hemisphere.

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