Abstract
Phytoplankton blooms are frequent in the coastal waters of the northwestern Bay of Bengal (BoB), with diatom blooms being the most common. For the first time, this study investigated the long-term trend in ocean color satellite-retrieved diatom distribution in coastal waters of the northwestern BoB. A retrospective analogy of phytoplankton bloom events corroborated with earlier in situ observations. The temporal distribution of diatom revealed a bimodal annual trend with peaks during the pre- and post-southwest monsoon periods. This pattern could be attributed to the enhanced degree of phytoplankton growth-promoting nutrient availability along with favorable environmental conditions during both pre- and post-monsoon periods. Diatom distribution indicated a more extensive spatial spread during the post-southwest monsoon. The present study also substantiated diatom availability as a conducive factor for the bloom of heterotrophic Noctiluca scintillans and exudation by Trichodesmium as an excellent source of nutrients for diatom growth. This study suggests developing phytoplankton species-specific satellite retrieval algorithms and ocean color sensors of higher spatiotemporal efficiency, to gain a deeper understanding of the effect of blooms on ecosystem functioning.
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Data availability
The authors confirm that the data supporting the findings of this study are available within the article and source files of the data are available at https://oceandata.sci.gsfc.nasa.gov/MODIS-Aqua/Mapped/Daily/4km/.
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Acknowledgements
The authors thank the authorities of their respective institutions for their encouragement. The authors also acknowledge the NASA-GSFC for making available MODISA ocean color products and the software development-up-gradation team of SeaDAS. The first author (SS) extends thanks to the Science and Engineering Research Board (SERB), Department of Science and Technology (DST), Govt. of India for awarding the National Post-Doctoral Fellowship (Award No. PDF/2016/002087). This is INCOIS contribution No. 467.
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SS conceived the hypothesis from the previous work of AAL and carried out the literature review; AS, SKB, and AKJ acquired satellite data and carried out data processing; AS and AKJ prepared the graphical illustrations; SS, SKB, AS, and AAL interpreted data; SS and SKB drafted the manuscript; AAL, TMB, KKB, and TA provided necessary inputs for the main text and revised the draft; all authors read and approved the final version of the manuscript.
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Srichandan, S., Baliarsingh, S.K., Samanta, A. et al. Satellite-Based Characterization of Phytoplankton Blooms in Coastal Waters of the Northwestern Bay of Bengal. J Indian Soc Remote Sens 50, 2221–2228 (2022). https://doi.org/10.1007/s12524-022-01597-6
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DOI: https://doi.org/10.1007/s12524-022-01597-6