Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/7091
Title: Summer Chlorophyll - A distribution in eastern Arabian Sea off Karnataka - Goa coast from Satellite and in-situ observations
Authors: Raghavan BR 
Raman M 
Chauhan P 
Sunil Kumar B 
Shylini SK 
Mahendra RS 
Nayak SR 
Keywords: Physical oceanography;Satellites;Water
Issue Date: 2006
Publisher: Proceedings of SPIE - The International Society for Optical Engineering
Project: Remote Sensing of the Marine Environment 
Goa, India 
November 13, 2006 
Abstract: Chlorophyll-a maps derived from IRS-P4 Ocean Color Monitor (OCM) was used to study the distribution pattern of phytoplankton biomass in the eastern Arabian sea off Karnataka - Goa coast, southwest coast of India. The data was compared with in-situ measurements of chlorophyll-a concentration estimated for 100 stations covering an area of more than 4000 km 2 in the above region. The presence of dense algal blooms spread over an area of almost 100 km 2 representing Trichodesmium sp. 18km off Kumta - Gokarna in the eastern Arabian Sea depicts high value (30 to 40 mg/m3) of chlorophyll concentration. Similarly, around the Nethrani Island, off Bhatkal, the surface concentration ranged from 5 to 10 mg/m 3. The secchi depth varied from 4 to 8 m near the island. The sea surface area enveloping this high bloom (around the island) depicts a normal distribution of chlorophyll-a ranging from of 0.1 to 5 mg/m 3. It is suggested here, that the low salinity value (35 to 35.2o) around the Nethrani Island enhances the algal bloom due to enrichment of nutrients in the shallow marine environment through probable inputs of nutrient charged fresh water from the island aquifers. Near river mouths, the values are marginally high in the range of 3 to 5 mg/m 3, probably enforced by riverine nutrient inputs well depicted by the Tadri River. The satellite (IRS-P4 OCM) derived images of chlorophyll during summer also shows high values as a band parallel to the coast. During the occurrence of algal blooms this band, parallel to the coast, widens offshore and this phenomenon of widening is typically absent during non-bloom summer scenarios, as identified for summer 2005.
URI: http://hdl.handle.net/123456789/7091
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