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An anomalous cooling event observed in the Bay of Bengal during June 2009

Chacko, N and Ravichandran, M and Rao, RR and Shenoi, SSC (2012) An anomalous cooling event observed in the Bay of Bengal during June 2009. Ocean Dynamics, 62 (5). pp. 671-681.

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Abstract

Sea surface temperature (SST) variability over the Bay of Bengal (BoB) has the potential to trigger deep moist convection thereby affecting the active-break cycle of the monsoons. Normally, during the summer monsoon season, SST over the BoB is observed to be greater than 28°C which is a pre-requisite for convection. During June 2009, satellite observations revealed an anomalous basin-wide cooling and the month is noted for reduced rainfall over the Indian subcontinent. In this study, we analyze the likely mechanisms of this cooling event using both satellite and moored buoy observations. Observations showed deepened mixed layer, stronger surface currents, and enhanced heat loss at the surface in the BoB. Mixed layer heat balance analysis is carried out to resolve the relative importance of various processes involved. We show that the cooling event is primarily induced by the heat losses at the surface resulting from the strong wind anomalies, and advection and vertical entrainment playing secondary roles.

Item Type: Article
Additional Information: Copyright of this article belongs to Springer.
Uncontrolled Keywords: Bay of Bengal;Sea surface temperature;Mixed layer heat budget;Ocean–atmosphere interaction
Subjects: Oceanography > oceanography
Depositing User: INCOIS Library
Date Deposited: 11 Dec 2013 09:42
Last Modified: 11 Dec 2013 09:42
URI: http://moeseprints.incois.gov.in/id/eprint/151

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