Journal of Applied Remote SensingSeasonal and interannual variability of sea surface chlorophyll a concentration in the Arabian Sea
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Seasonal and interannual variability of chlorophyll a concentration along the West Coast of India (WCI) was detected spatially by ocean colour satellite remote sensing during 1998 - 2003. Start timing of the summer bloom was different spatially. The summer bloom started Trivendrum in May, along Cochin coast in June, northward of it in July and also showed interannual variability that corresponding with the wind speed in the area. Summer bloom in 1998 and 2002 appeared about two weeks earlier than in 1999, 2000, 2001 and 2003, and it corresponded with weak winds that can lead to an early development of the thermocline. The bloom was late in 1999 and 2001 at Trivendrum and along the Cochin coast, and in the northern are in 2000. It corresponded with stronger wind stress that delayed seasonal thermocline formation. The winter bloom appeared from early October to last week of January, and it did not have a clear temporal transition. The area where chlorophyll a concentration exceeds 5 mg/m3 was wider in northern area than in the southern area of the WCI every year. The magnitude of winter bloom was different between years, but it did not show a relation with average wind speed in winter. Those results indicated that the timing of the seasonal bloom along the WCI is largely affected by the variability of global climate such as El Nino Southern Oscillation (ENSO) events.