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2016

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Choudhury, S. B.

Comparing the Spatio-Temporal Variability of Remotely Sensed Oceanographic Parameters between the Arabian Sea and Bay of Bengal throughout a Decade

Abstract Views :247 | PDF Views:100

Authors

Sourav Das ¹, Abhra Chanda ¹, Suparna Dey ¹, Sanjibani Banerjee ¹, Anirban Mukhopadhyay ¹, Anirban Akhand ¹, Amit Ghosh ¹, Subhajit Ghosh ¹, Sugata Hazra ¹, D. Mitra ², Aneesh A. Lotliker ³, K. H. Rao ⁴, S. B. Choudhury ⁴, V. K. Dadhwal ⁴

Affiliations
1 School of Oceanographic Studies, Jadavpur University, 188 Raja S. C. Mullick Road, Kolkata 700 032, IN
2 Indian Institute of Remote Sensing, 4, Kalidas Road, Dehradun 248 001, IN
3 Indian National Centre for Ocean Information Services, Kukatpally, Hyderabad 500 090, IN
4 National Remote Sensing Centre, Balanagar, Hyderabad 500 042, IN

Source

Current Science, Vol 110, No 4 (2016), Pagination: 627-639

Abstract

The spatio-temporal variability of sea-surface temperature (SST), photosynthetically active radiation (PAR), chlorophyll-a (Chl-a), particulate organic carbon (POC) and particulate inorganic carbon (PIC) was evaluated in the Arabian Sea (ABS) and Bay of Bengal (BoB), from July 2002 to November 2014 by means of remotely sensed monthly composite Aqua MODIS level-3 data having a spatial resolution of 4.63 km. Throughout the time period under consideration, the surface waters of ABS (27.76±1.12°C) were slightly cooler than BoB (28.93±0.76°C); this was observed during all the seasons. On the contrary, the availability of PAR was higher in ABS (45.76±3.41 mol m^-2 d^-1) compared to BoB (41.75±3.75 mol m^-2 d^-1), and its spatial dynamics in the two basins was mainly regulated by cloud cover and turbidity of the water column. The magnitude and variability of Chl-a concentration were substantially higher in ABS (0.487±0.984 mg m^-3), compared to BoB (0.187±0.243 mg m^-3), and spatially higher values were observed near the coastal waters. Both POC and PIC exhibited higher magnitudes in ABS compared to BoB; however, the difference was substantially high in case of POC. None of the parameters showed any significant temporal trend during the 12-year span, except PIC, which exhibited a significant decreasing trend in ABS.

Keywords

Marine Ecosystems, Oceanographic Parameters, Remote Sensing, River Basins, Spatio-Temporal Variability.

Full Text

References

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Integrated Role of SST, PAR and CDOM in Summer Reef Bleaching during 2010 and 2011 along the Lakshadweep Islands

Abstract Views :261 | PDF Views:82

Authors

R. Ranith ¹, L. Senthilnathan ¹, M. Machendiranathan ¹, T. Thangaradjou ¹, A. Saravana Kumar ¹, S. K. Sasamal ², S. B. Choudhury ²

Affiliations
1 Centre of Advanced Study in Marine Biology, Annamalai University, Parangipettai 608 502, IN
2 National Remote Sensing Centre, Indian Space Research Organisation, Balanagar, Hyderabad 500 625, IN

Source

Current Science, Vol 110, No 9 (2016), Pagination: 1832-1838

Abstract

The role of sea-surface temperature (SST), photosynthetically active radiation (PAR) and chromophoric dissolved organic matter (CDOM) on bleaching events along the Lakshadweep archipelago was studied for the summer of 2010 and 2011. The present study revealed similar SST pattern (30.8-31.9°C) and high PAR availability (48-50 E m^-2 day^-1) during the summer weeks of 2010 and 2011. However, the CDOM content varied significantly between 0.5 and 7 during 2010 and 2011. Stress from the elevated SST and PAR levels coinciding with low CDOM content (ultra violet radiation (UVR) transparent water column) might have resulted in large-scale bleaching during 2010. Low PAR and high CDOM (UVR opaque water column) might have prevented Lakshadweep corals from large-scale bleaching during 2011. Statistical analysis also confirmed that the high bleaching event of 2010 was due to coupled stress imparted by SST, PAR, CDOM and the unusually calm state of the sea.

Keywords

Bleaching, Dissolved Organic Matter, Photo-Synthetically Active Radiation, Sea-Surface Temperature.

Full Text

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