Increased stratification may not only be a consequence of sea surface warming, but also the inflow of more freshwater from the major estuaries in the Bay of Bengal,either from increased precipitation or from the melting of Himalaya glaciers.
Stratification has been identified as one of the factors limiting the productivity,as nutrients are to a large extent trapped below the euphotic zone or in the deep sea(PrasannaKumaretal.,2002).