Interannual variability in simulated circulation along east coast of India

115-120A two and a half layer reduced gravity model is used to simulate the upper layer circulation along the east coast of India. The model climatology of upper layer circulations obtained from 15 year model simulation (1977-1991) is found to be in good agreement with the observed currents. A cyclonic gyre found in June-July around 10°N in the lower layer (~60m below surface) has large interannual variability. The gyre is absent in 1982 and 1984 and is very weak in 1987. Transport anomalies computed at four sections along the coast indicate large interannual variability. The upper layer transports along some section have shown a periodicity of 5-6 years