Low period variability in Tropical Rainfall Measuring Mission Microwave Imager measured sea surface temperature over the Bay of Bengal during summer monsoon

摘要

Sea surface temperature measured by the Tropical Rainfall Measuring Mission Microwave Imager (TMI) over the Bay of Bengal during monsoon was found to exhibit a low-period intra-seasonal mode of 8—16 days, in addition to the 30-60 days mode. This unique feature is attributed to the coherent response of the top freshwater layer, formed due to high precipitation and river run-off, to synoptic atmospheric monsoon processes. These results were obtained through Fourier, Morlet wavelet and time series analyses applied on TMI and buoy data of June-September during 1998-2001.