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Decadal Pattern of Spatial and Temporal Variability of Nitrate Along the Southwest Bay of Bengal Using Remote Sensing Techniques

  • D. Poornima
  • R. Shanthi
  • L. Senthilnathan
  • T. Thangaradjou
  • A. Saravanakumar
  • R. K. Sarangi
Research Article
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Abstract

The seasonal and interannual variability of sea surface nitrate was studied in the southwest Bay of Bengal. MODIS-Aqua-derived SST and chlorophyll data are used to develop seasonal nitrate maps for the period of 2002–2017. Seasonally developed nitrate images were validated for the year 2013 with corresponding in situ datasets, and the validation of this nitrate model provides the statistically significant relationship for postmonsoon (R2 = 0.612), summer (R2 = 0.535), premonsoon (R2 = 0.554) and monsoon (R2 = 0.533) seasons. The seasonal SST, chlorophyll a, nitrate and wind speed images depict the clear seasonal pattern between the seasons without any abrupt increase or decrease in trend observed during all these years. This was also confirmed by the Kruskal–Wallis one-way analysis of variance on ranks with a statistical significance (P = < 0.001) between the seasons. From the results, this is a clear indication that the nitrate concentration is under the natural control without any anthropogenic contaminations.

Keywords

Chlorophyll SST Nitrate Seasons MODIS Paraboloid 

Notes

Acknowledgements

Authors are thankful to the Space Application Centre, Government of India, Ahmedabad, for financial assistance through (SAC/EPSA/MPS/MOP-3) Program of Indian Space Research Organisation. We are grateful to the Director and Dean of Annamalai University for their support.

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Copyright information

© Indian Society of Remote Sensing 2018

Authors and Affiliations

  • D. Poornima
    • 1
  • R. Shanthi
    • 1
  • L. Senthilnathan
    • 1
  • T. Thangaradjou
    • 1
    • 2
  • A. Saravanakumar
    • 1
  • R. K. Sarangi
    • 3
  1. 1.Faculty of Marine Sciences, Centre of Advanced Study in Marine BiologyAnnamalai UniversityParangipettaiIndia
  2. 2.Science and Engineering Research BoardNew DelhiIndia
  3. 3.Planetary Sciences and Marine Optics Division, Biological and Planetary Sciences and Applications GroupSpace Application Centre (ISRO)AhmedabadIndia

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