Remote Sensing Observations on Impact of Phailin Cyclone on Phytoplankton Distribution in Northern Bay of Bengal


Remote sensing-primarily based analysis has been applied to study the impact of “Phailin” cyclone on ocean phytoplankton distribution off Odisha coast and on the northern Bay of Bengal water. Oceansat-a pair of Ocean Colour Monitor (OCM) and MODISTerra sensors-derived chlorophyll images have been generated over the study area throughout October 2013. There has been observation of drastic modification within the chlorophyll concentration of the north-western Bay of Bengal water with impact of the cyclone “Phailin,” which hit Gopalpur, Odisha coast on twelve October night at around twenty one:0zero h IST. The postcyclone pictures of Oceansat-2 OCM information and retrieved chlorophyll concentration were observed to be terribly high, mg/m3 in coastal water, that was around 0.5-1.0 mg/m3 throughout precyclone. Similarly, the postcyclone chlorophyll was around 0.eighty-one.fifty mg/m3 in the offshore water, unusually high compared to precyclone concentration (<;zero.sixty mg/m3). The cyclone track of India Meteorological Department (IMD) has been superimposed on chlorophyll images and observed as proxy along the chlorophyll front with algal bloom features. There has been observation of cooling within the northern Bay of Bengal and off Odisha coast with impact of the induced upwelling, entrainment and mixing of the water column, as evident from the sea surface temperature (SST) data analysis. Attention-grabbing features like cold core eddies and fronts have been visualized. This study is vital to assess the impact of Phailin cyclone on ocean productivity on the native and basin scale and its deviation from seasonal trend further.

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