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Impact of barrier layer on winter-spring variability of the southeastern Arabian Sea

Masson, S.; Luo, J-J.; Madec, G.; Vialard, J.; Durand, F.; Gualdi, S.; Guilyardi, E.; Behera, S.; Delecluse, P.; Navarra, A.; Yamagata, T.. 2005 Impact of barrier layer on winter-spring variability of the southeastern Arabian Sea. Geophysical Research Letters, 32. L07703. 10.1029/2004GL021980

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Abstract/Summary

In the present study, we use a coupled model to evaluate the effect of shallow salinity stratification on the sea surface temperature (SST) and on the monsoon onset in the southeastern Arabian Sea (SEAS). A 100-year control experiment shows that the coupled model reproduces the main climatic features in this region in terms of SST, precipitation and barrier layer (BL). A 100-year sensitivity experiment (where BL effects have been suppressed in the SEAS) shows that BL enhances the spring SST warming by 0.5°C, and leads to a statistically significant increase of precipitation in May (3 mm/day) linked to an early (10 to 15 days) monsoon onset. This suggests that the BL extent may be a useful predictor of the summer monsoon onset in the area with a two-month lead-time. However the effect above is mostly concentrated in the SEAS, and there is no significant impact over continental India.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2004GL021980
ISSN: 0094-8276
Date made live: 10 Dec 2008 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/164367

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