Abstract
The long-term distribution of in situ optically active substances (OAS), accuracy assessment of satellite retrieved chlorophyll-a (chl-a) and its long-term trend has been carried out at a coastal site of the north-western Bay of Bengal. The temporal distribution of chl-a, total suspended matter (TSM) and absorption due to coloured dissolved organic matter at 440 nm (aCDOM440) discerned a common peak during southwest monsoon season (August–October). Chl-a also showed a prominent peak during pre-southwest monsoon period (March–April). The spatial variability of TSM and aCDOM440 was maximum during southwest monsoon, whereas in the case of chl-a, it was during pre-southwest monsoon. The accuracy assessment of chl-a retrieved from Moderate Resolution Imaging Spectroradiometer-Aqua (MODISA), Ocean Colour Monitor-2 (OCM-2) and Visible Infrared Imager Radiometer Suite (VIIRS) showed overestimation in nearshore waters. The error in satellite measurement of chl-a was within the range of 33 to 51%. The chl-a retrieved from MODISA was most accurate as indicated by statistical analysis. The long-term trend in satellite chl-a clearly indicated bi-modal distribution with a primary peak during pre-southwest monsoon attributed to recurrent phytoplankton bloom that was mostly confined to nearshore waters. Whereas, the secondary peak in chl-a, during the end of southwest monsoon, spreads far offshore.
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Acknowledgements
The authors wish to acknowledge the NASA-GSFC for making available satellite data of MODIS and VIIRS. The authors acknowledge the Ocean Observations and Data Management Group (ODG), INCOIS for providing OCM-2 data. Thanks to the development team of SeaDAS. The authors sincerely acknowledge Director, INCOIS for his support and encouragement. This is INCOIS contribution no. 362.
Funding
The present study was financially supported by the SATellite Coastal and Oceanographic Research (SATCORE) programme coordinated by the Indian National Centre for Ocean Information Services (INCOIS).
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Lotliker, A.A., Baliarsingh, S.K., Sahu, K.C. et al. Long-term chlorophyll-a dynamics in tropical coastal waters of the western Bay of Bengal. Environ Sci Pollut Res 27, 6411–6419 (2020). https://doi.org/10.1007/s11356-019-07403-0
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DOI: https://doi.org/10.1007/s11356-019-07403-0