Seasonal Variability of Circulation Along the North-East Coast of India Using Princeton Ocean Model
The coastal circulation of northern Bay of Bengal, highlighting the West Bengal-Orissa coast is subjected to seasonal reversing of monsoon circulation. Additional forcing occurs due to freshwater flux from rivers. The surface circulation patterns and SST were analysed in former studies for the whole Bay of Bengal coast, and the effect of freshwater influx on circulation patterns was also studied in detail. We have corroborated those results by studying the surface circulation patterns in the north-east coast of India, on a month-to-month basis using Princeton Ocean Model (POM) forced by wind, salinity, heat flux and temperature for the year 2001. The reversal of surface current along the coast is observed between summer and winter monsoons. The study location shows signature of upwelling during the month of July, along with low-pressure cold-core cyclonic eddy. The presence of upwelling was also confirmed in our study by comparing the result with SeaWiFS chlorophyll data. The upwelling phenomenon was investigated for the July month of the years 1998 and 1996 and it is inferred that there is no correlation of upwelling with former and subsequent El-Niño and La-Nina years.
KeywordsBay of Bengal Upwelling POM Monsoon
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