Role of Upper Ocean Dynamics on the Intensification and Ocean Surface Response of two Super Cyclones in the Arabian Sea

Upper ocean thermodynamic and biological responses between the two super cyclones namely Gonu (1-7 June 2007) and Kyarr (24 Oct -02 Nov 2019) were investigated using multi-satellite datasets, and hycom model data.During Gonu, one strong cooling patch (>5.5°C) observed but in the case of Kyarr it is 3.8°C was observed along its track.The locations of these cold patches are highly correlated with the relative depth of the 26°C isotherm and mixed layer depth (MLD) and upper ocean heat content (UOHC).The enhancement of surface chlorophyll a (chl-a) concentration was detected in these cold regions as well, mainly due to the TC-induced mixing and upwelling.Moreover, the existing ocean cyclonic eddy has been found to significantly modulate the magnitude of surface cooling and chl-a increase during the Kyarr period.The possible causes of intensity change of cyclones were also explored with UOHC.Upper oceanic conditions play a noticeable role in the intensification of both super cyclones.