Seasonal variability of sea surface chlorophyll-a of waters around Sri Lanka |
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| Authors: | Kanthi K A S Yapa |
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| Institution: | (1) Department of Physics, University of Ruhuna, Matara, Sri Lanka |
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| Abstract: | Remotely sensed data on ocean colour of waters surrounding Sri Lanka received from the Coastal Zone Colour Scanner (CZCS)
are processed and analyzed. Raw data of 1 km resolution on relatively cloud free days during 1978–1986 are processed to produce
sea surface chlorophyll maps within latitudes 4.5N-11N and longitudes 78E-85E, a region in the Indian Ocean surrounding Sri
Lanka. The processed data include about 110 single day maps and composite averages for each month and season. The months of
July, August and September are omitted in the calculation of averages due to insufficient data. The waters in the Gulf of
Mannar and Palk Bay areas show high chlorophyll-a concentrations throughout the year. However, these high values may represent
other suspended particles and dissolved organic matter besides chlorophyll-a as this region is shallow (< 100 m). Regions
with high chlorophyll concentrations (> 0.5 mg m-3) along the coast and western ocean region can be seen in the months of October and November, after the southwest monsoon
period. As high surface chlorophyll concentrations may indicate high productivity, these regions need extensive measurements
of primary production and also continuous monitoring of fish catches, during and after the southwest monsoon. Studies of particle
composition in shallow water areas, in particular waters in Palk Bay and Gulf of Mannar, should be carried out in order to
elucidate the effect of non-phytogenic. |
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| Keywords: | Chlorophyll-a CZCS Sri Lanka seasonal variability fishery industry |
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