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Post-tsunami impact study on thermohaline structure in the Bay of Bengal

Luis, AJ and Pednekar, SM and Sudhakar, M (2007) Post-tsunami impact study on thermohaline structure in the Bay of Bengal. Current Science, 93 (5). pp. 699-703.

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Temperature and salinity profiles measured on-board ORV Sagar Kanya, during 18 January-17 February 2005, in the vicinity of the Chennai coast and west of the Andaman (AN) Islands, have been employed to assess and quantify the post-tsunami impact on the upper-ocean thermohaline structure, by comparing these with previous year's data. In the vicinity of the AN Islands, the sea surface temperature increased by 0.5°C and surface salinity decreased from 33.5 to 32 psu, between 90°E and 92°E along 10°N. This freshening has been attributed to westward geostrophic flow from the AN Sea facilitated by a sea surface height gradient inferred from the merged multi-mission satellite data. Significant temperature variations exceeding 1°C were observed between 50 and 250 m, west of the AN Islands. Near the Chennai coast (10°N, 80.9°E), influx of freshwater from the northern Bay of Bengal reduced salinity by 0.8 psu and stratification in the upper 100 m was observed. Upward shift in the 20°C isotherm was observed at all locations, suggesting a vertical entrainment. In general, this study reveals that considerable thermohaline variability has occurred in the upper 300 m water column, which is expected to have a significant impact on primary production and fisheries.

Item Type: Article
Additional Information: Copyright of this article belongs to Indian Academy of Sciences.
Subjects: Oceanography > oceanography
Depositing User: NCAOR Library
Date Deposited: 30 Dec 2013 10:33
Last Modified: 30 Dec 2013 10:33

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