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Describe how stratification occurs and how it is eroded to change the surface mixed layer.

Describe how stratification occurs and how it is eroded to change the surface mixed layer.

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Stratification occurs due to excessive rainfall or freshwater deposit from somewhere like river. Due to water stratification the primary productivity decreases. That's why regions, where we get water stratification there the organism concentration, is quite less in comparison to the locations having upwelling mechanism.

Due to stratification the mixed layer thickness increases, that's why the thermohaline depth increases.

For this we can take the example of the east coast and west coast of India. The east coast of India is marked by the Bay of Bengal, which encounters several river water input. So there we get the water stratification and the productivity is less, But at the west coast of India Arabian sea is there, which marked by the upwelling. So at Arabian sea the productivity is more.

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