Observed signals of upwelling and downwelling along the west coast of India

Present study indicates the extension of upwellingto the northern part of the west coast of India. Upwellingalong the southwest coast of India starts at the southern tip during April, propagates northward as the summer monsoonprogresses and ends by September. However along the northwest coast, the upwellingintensifies during August and continues till October. The southwest coast is characterized by downwellingduring October to March, whereas along the northwest coast upwellingcomes to an end by November and sinking occurs during December to March. Compared to the northwest coast, both upwellingand downwellingare stronger along the southwest coast of India. During the peak southwest and northeast monsoon, magnitude of the mean vertical velocity with respect to 100m depth is 2.15 x 10-5m/s and 0.76 x 10-5m/s along the southwest and northwest coast, respectively.