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Thermohaline circulation is a very slow and extremely deep movement of water in the oceans around the world. A complete cycle can take thousands of years to complete from start to finish, with the cycle contributing a great deal to the mixing of the world's oceans.hermohaline circulation is a very slow and extremely deep movement of water in the oceans around the world. A complete cycle can take thousands of years to complete from start to finish, with the cycle contributing a great deal to the mixing of the world's oceans.
In contrast to the wind-driven currents, the THC is not confined to surface waters but can be regarded as a big overturning of the world ocean, from top to bottom.The thermohaline circulation consists of:1  Deep water formation: the sinking of water masses, closely associated with (but not to be confused with) convection, which is a vertical mixing process, [2]).n cold regions the highest surface water densities are reached, this causes convective mixing and sinking of deep water, which drives the circulation. Reality is more complex. Pressure gradients at depth, resulting from density gradients in the overlying waters, are the driving force in the equations of motion.