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Temporal and spatial variability of surface chlorophyll-a concentration and associated physical parameters in Northern Bay of Bengal.

Abstract: Ocean covers about 70% of the earth’s surface thus making it an important player of earth climate. In complex ocean environments it is essential to gain knowledge about the coupling of physical and biological processes to understand how the temporal, annual and inter-annual variation occur and what are the forcing mechanisms behind these variations. Satellites provided a great opportunity for oceanographers to understand the air-sea interaction.

The aim of this research is to detect an informative prospective (monthly and seasonal changes) of surface chlorophyll-a and associated physical parameters in the Northern Bay of Bengal where such studies are scantly. Objectives of this study is to investigation of temporal and spatial variability of satellite derived chlorophyll-a and associated physical parameters and find out the mechanism of process   in the study area during the period from 2003 to 2014.

The present study portraits the chlorophyll-a pattern using satellite derived data obtained from Modis aqua to find out the relationship between chlorophyll a and associated physical parameters using sea surface temperature (SST), Photosynthically Active Radiation (PAR), Diffusive Attenuation Coefficient (kd490), CDOM Index, and Wind data. Investigation on these parameters to elucidate their impact on chlorophyll-a distribution in the study area. This helped to decipher how physical parameters were interacting with biological process in the surface layer.

High spatial and temporal (especially monthly) variability was observed in different part of Northern Bay of Bengal. Basin wide highest chlorophyll-a observed in October and lowest in June. Every zone shown different process activate for high surface chlorophyll-a. Northern part of the study area process is controlled by river water. This study revealed that eastern part controlled by North eastern monsoon as well as local upwelling and western part controlled by ocean current in summer monsoon. But notice that, high chlorophyll always associated with coastal portion. In the Open ocean have very low chlorophyll-a. Seasonal reversal wind direction in summer and winter altered physical mechanisms thus play an important role activate different mechanism for changing biological response in different part of Northern Bay of Bengal.

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