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Satellite and In Situ Observations of a Phytoplankton Bloom from Coastal Bay of Bengal: Role in pCO2 Modulation

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Abstract

A phytoplankton bloom was monitored in coastal waters of Bay of Bengal and its influence in water column properties was investigated. Significant draw down of CO2 was noted within the vicinity of the bloom associated with high chlorophyll biomass. Microscopic analysis revealed diatoms as the dominant population. Skeletonema costatum a diatom, reached cell density of 36,898 cells l−1 within the bloom. The lowest surface pCO2 observed was 287 µatm at the southern end of the transect covarying with surface chlorophyll of 1.090 µg l−1. At the northern end the surface pCO2 went as low as 313 µatm. The pCO2 levels below the mixed layer increased twice of that of surface value (~600 µatm). The chlorophyll values observed by Ocean Colour Monitor-2 were modestly related with the in situ measurements. The primary productivity derived from growth rate, assimilation number and maximum surface chlorophyll was 160.6 mg C m−2 day−1 leading to a modest sequestration ~of 0.08 Gg of carbon per day by the surface waters. Our observations reflects the potential role of diatom blooms on coastal carbon dynamics therefore should be carefully monitored in realm of anthropogenic changes.

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Acknowledgments

This work was carried out as a part of the National Carbon Project (NCP) of ISRO-IGBP. Authors would like programme director ISRO IGBP and Chairman ISRO for their constant encouragement and support. PL would like to thank ISRO for her research support.

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Authors and Affiliations

  1. Ocean Sciences Group, Earth and Climate Science Area, National Remote Sensing Centre, Indian Space Research Organization, Hyderabad, India

    Rajdeep Roy, K. H. Rao, T. Preethi Latha, Vinay Kumar Dadhwal, P. V. Nagamani & S. B. Choudhury

  2. CSIR-National Institute of Oceanography, Visakhapatnam, India

    V. V. S. S. Sarma

  3. Centre for Bay of Bengal Studies, Andhra University, Visakhapatnam, India

    Seetharam Pondala

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  1. Rajdeep Roy
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  2. K. H. Rao
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  5. V. V. S. S. Sarma
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Correspondence to Rajdeep Roy.

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Roy, R., Rao, K.H., Latha, T.P. et al. Satellite and In Situ Observations of a Phytoplankton Bloom from Coastal Bay of Bengal: Role in pCO2 Modulation. J Indian Soc Remote Sens 45, 513–524 (2017). https://doi.org/10.1007/s12524-016-0604-3

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  • DOI: https://doi.org/10.1007/s12524-016-0604-3

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