Seasonal and interannual variability of phytoplankton pigment in the Laccadive (Lakshadweep) Sea as observed by the Coastal Zone Color scanner |
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| Authors: | Lisa Jade Lierheimer Karl Banse |
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| Institution: | (1) Office of International Affairs, Division of Management Authority, U.S. Fish and Wildlife Service, 4401 North Fairfax Drive, 22046 Arlington, VA;(2) Present address: School of Oceanography, University of Washington, Box 357940, 98195-7940 Seattle, WA, USA |
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| Abstract: | Based on Coastal Zone Color Scanner data from November 1978 through December 1981, the seasonal cycle of phytoplankton pigment
in the upper part of the euphotic zone is established for the offshore Laccadive Sea. Year-round, the pigment content is low
and the seasonal range is small, following the pattern of the nutrient-poor Arabian Sea to the west. Apparently, indigenous
phytoplankton blooms are absent. July and August, however, were poorly studied because of cloud cover. Interannual differences
during the northeast monsoon and the spring intermonsoon periods are minor. The abundant phytoplankton caused by the upwelling
off India during the southwest monsoon remains essentially restricted to the shelf, but there are occasional large, zonal
outbreaks into the Laccadive Sea, as well as others advected to the south of India. Visual inspection of the raw CZCS scenes
for June through November 1982–1985, with almost no data until August or even September, shows such outbreaks of pigment-rich
water to be common. Inspection of monthly SeaWiFS images for 1997 through part of 2001 confirms the absence of indigenous
phytoplankton blooms. |
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| Keywords: | Laccadive sea Lakshadweep sea CZCS phytoplankton pigment seasons 1979– 1981 |
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