Decadal variations of sea surface temperature in the eastern Arabian Sea and its impacts on the net primary productivity

Vinaya Kumari, P and Jayappa, K S and Thomas, Sujitha and Gupta, Anurag (2021) Decadal variations of sea surface temperature in the eastern Arabian Sea and its impacts on the net primary productivity. Spatial Information Research, 29. pp. 137-148.

Spatial Information Research_2021_Sujitha Thomas_Abstract.pdf

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    Ten-year satellite derived data (January 2007 to December 2016) were used to investigate the variability of Chlorophyll-a (Chl-a), sea surface temperature (SST), net primary production (NPP) in the eastern Arabian Sea (AS). This study is aimed to show the coupling of physical and biological processes to understand how temporal, annual and inter-annual variations occur and the forcing mechanisms behind these variations in the ocean environments. This work is linked to Indian Ocean Dipole and the El Nin˜o/Southern Oscillation, which frequently co-occur and drives inter-annual changes within the AS. Vertically Generalized Production Model was used to estimate NPP using chl-a, Photosynthetically Available Radiation, euphotic depth, and maximum photosynthetic rate from SST. The relationship between NPP and SST showed change in the pattern over the study period. The NPP in the AS is characterized by an unusual decline during El Nin˜o events. AS is more productive during summer monsoon (June–September) due to coastal upwelling, wind driven mixing and lateral advection processes. There was decline in NPP after 2014 and this trend continued in the following years. The present investigation revealed that the strong El Nin˜o condition was observed in 2015 and productivity of AS declined by * 19%, while SST increased by * 2% from an overall average of 2007–2016. Increased SST and low productivity could result in low fish catch in AS. Increasing trend in SST could be attributed to the extreme events like cyclones occurring along the west coast of India.

    Item Type: Article
    Uncontrolled Keywords: Primary productivity ; Climate variability ; Sea surface temperature ; Fish catch
    Subjects: Oceanography
    Oceanography > Seawater study
    Divisions: CMFRI-Mangalore
    Depositing User: Arun Surendran
    Date Deposited: 09 Apr 2021 06:03
    Last Modified: 09 Apr 2021 06:03

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