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Spring inter monsoon algal blooms in the Eastern Arabian sea: Shallow marine encounter off Karwar and Kumbla Coast using a Hyperspectral radiometer

Raghavan, BR and Deepthi, T and Ashwini, S and Shylini, SK and Kumarswami, M and Kumar, S and Lotliker, AA (2010) Spring inter monsoon algal blooms in the Eastern Arabian sea: Shallow marine encounter off Karwar and Kumbla Coast using a Hyperspectral radiometer. International Journal of Earth Sciences and Engineering, 3 (6). pp. 827-832.

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Abstract

We encountered the presence of algal blooms in the shallow coastal waters; typical of case II conditions off Karwar (Karnataka) and Kumbla (Kerala), eastern Arabian Sea during the Inter Monsoon. The algal blooms are Trichodesmium species and appear in shades of brown strands and tufts representing T. Erythraeum. Sites of the algal blooms depict a high spectrophotometric surface chlorophyll-a value ranging from 32- 39 mgm-3 and sea surface area surrounding the bloom sites depict lower values of chlorophyll-a (1-3 mgm-3). In-situ Hyperspectral radiometer measurements depict the existence of Chlorophyll Maxima at various depths (3.0-37.31 ug/l) representing the blooms along with their surface appearance. Contrary to the Karwar blooms that are dense, the blooms at Kumbla were dispersed and scantly distributed on the surface waters. Our sea-truth data on mean Sea Surface Temperature of Karwar (30.61 °C) that simulates the Kumbla (30.34 °C) scenario and the mean salinity of Kumbla was 35.86psu, and that of Karwar that is slightly elevated (35.40psu), suggests that SST and salinity probably do not either directly enhance or provide an environment for the eterioration of algal blooms.

Item Type: Article
Additional Information: Copyright of this article belongs to CAFET-INNOVA TECHNICAL SOCIETY
Subjects: Oceanography > oceanography
Divisions: Mangalore Univ - Marine Geology and Geophysics
Depositing User: INCOIS Library
Date Deposited: 08 Dec 2013 09:28
Last Modified: 25 Jun 2014 04:47
URI: http://moeseprints.incois.gov.in/id/eprint/185

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