Research Papers

Seasonal and interannual variability of SeaWiFS-derived chlorophyll-a concentrations in waters off the southwest coast of India, 1998-2003

[+] Author Affiliations
Kailasam Muni Krishna

Department of Meteorology and Oceanography, Andhra University, School of Earth and Atmospheric Sciences, Visakhapatnam, Andhra Pradesh 530 003 India

J. Appl. Remote Sens. 2(1), 023543 (October 24, 2008). doi:10.1117/1.3026540
History: Received July 28, 2008; Revised October 9, 2008; Accepted October 19, 2008; October 24, 2008; Online October 24, 2008
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Abstract

Seasonal and interannual variability in satellite-derived estimates of near-surface chlorophyll-a concentrations were examined in the four regions off the southwest coast of India from 1998-2003. Wind-induced upwelling predominates in late spring and summer, coinciding with the maximum in solar radiation, leading to increased accumulations of phytoplankton biomass. Chlorophyll concentrations varied from 2 to 10 mg/m3 and were generally lower in January-April and maximal in May-September. Chlorophyll concentrations along the coast followed a similar seasonal pattern (ranging from 0.5 to 4 mg/m3); however, concentrations were always greater on the Trivendrum and Cochin coast compared to the Calicut and Mangalore coast. The southwest coast is often cloud covered; data density maps provide an index of confidence in the 'regional' applicability of the summary statistics. One consequence of the 1997-1998 El Nino appears to be a reduction in chlorophyll concentration off Trivendrum and Cochin in 1998. An increased frequency of El Nino events may lead to a reduction in offshore carbon in this dynamic upwelling region. Six-month median chlorophyll concentrations were maximal in 2002 off Trivendrum and Cochin.

© 2008 Society of Photo-Optical Instrumentation Engineers

Citation

Kailasam Muni Krishna
"Seasonal and interannual variability of SeaWiFS-derived chlorophyll-a concentrations in waters off the southwest coast of India, 1998-2003", J. Appl. Remote Sens. 2(1), 023543 (October 24, 2008). ; http://dx.doi.org/10.1117/1.3026540


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