The Northern Indian Ocean (NIO) has a unique geographical setting as it is bifurcated by the Indian landmass resulting into two tropical basins viz. Arabian Sea (AS) and Bay of Bengal (BOB). These two basins are consistently influenced by the seasonally reversing monsoon wind forcing which in turn impact the surface circulation, precipitation, sea surface salinity (SSS) and exchange of water masses between the basins (Prasanna Kumar et al., 2004). The SSS is the most prominent physical parameter to distinguish these basins and also to control the dynamic and thermodynamic features of water masses (Behara et al., 2019; Pant et al., 2015; Pierce et al., 1995). In general, the SSS of BOB is below 34 psu throughout the year due to excess precipitation over evaporation and fresh water discharge from major perennial rivers such as Ganga-Brahmaputra (GB), Mahanadi-Brahmani, Krishna-Godavari and Irrawady (Behara et al., 2019; Dai et al., 2009). This freshening has greater impact on the air-sea interaction processes that modulates
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