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    Dynamics of subsurface chlorophyll maxima in the northern Indian Ocean

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    Date
    2024
    Author
    Garg, Shriya
    Gauns, M.
    Bhaskar, T.V.S.U.
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    Abstract
    Subsurface chlorophyll maxima (SCM) significantly contributes to oceanic primary productivity, emphasizing the need to study its dynamics and governing mechanisms. We used datasets from various platforms to investigate relationships between the SCM characteristics (SCM depth (ZSCM), SCM magnitude (Chlmax), SCM thickness (TSCM)) and environmental variables modulated by various physical processes in the Northern Indian Ocean (NIO). In the Arabian Sea (western NIO), seasonal processes like convective mixing and upwelling, primarily regulated the SCM characteristics. In the Bay of Bengal (eastern NIO), SCM characteristics were jointly influenced by fresh water influx, barrier layer formation, presence of eddies, and the propagation of Kelvin and Rossby waves. Any changes in these oceanic processes, potentially driven by climate change, could therefore impact oceanic primary production. Additionally, a positive association obtained between Chlmax and downward CO2 flux, while a shallower ZSCM, associated with higher concentrations of DMS, indicated SCM s role in regulating atmospheric gases.
    URI
    https://doi.org/10.1016/J.MARPOLBUL.2024.116891
    http://drs.nio.res.in/drs/handle/2264/9367
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