Abstract
AbstractAnalysis of Soil Moisture Active Passive (SMAP) mission derived sea surface salinity (SSS) during April 2015 to December 2017 in the Bay of Bengal (BoB) shows first revelation of new insight of existence of 30‐ to 90‐day and 10‐ to 20‐day period Intraseasonal Oscillations (ISOs) in SSS—all phase‐locked during August–December. The seasonal SMAP SSS anomaly (SSSA) minimum (−0.5 to −1.0 practical salinity unit, psu) occurs in October and exhibits year‐to‐year variation, while SSSA maximum (0.5 psu) occurs in June during 2015–2017. Interestingly, these ISOs encompass the negative phase of seasonal SSSA minimum (August–December) in a year and are related to seasonal variations in river discharge and surface freshwater flux (precipitation and evaporation), that in turn are impacted by the climatic events. Wavelet analysis reveals larger amplitude (−0.2 to 0.35 psu) 30‐ to 90‐day ISO in northern BoB during August–November. The northward propagation of the SSS ISOs would modulate the postmonsoon air‐sea interactions across the BoB.
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