Vertical velocities at an ocean front

It is well known that, except in some small areas, the open ocean can be considered as a biological desert (Williams and Follows, 1998). In fact, about 90% of the world’s fisheries are obtained in less than 2% of the total area of the world’s ocean, the upwelling regions. This can be easily understood because oceanic motions are mainly horizontal, with little connection between the upper and the deep ocean. These layers can be considered complementary, in a biological sense, since in the upper one the presence of light permits life, while the deep layers are usually rich in nutrients. Consequently, the rele

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