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BOBMEX: The Bay of Bengal Monsoon Experiment

Bhat, GS and Gadgil, S and Kumar, Hareesh PV and Kalsi, SR and Madhusoodanan, P and Murty, VSN and Rao, Prasada CVK and Babu, Ramesh V and Rao, LVG and Rao, RR and Ravichandran, M and Reddy, KG and Rao, Sanjeeva P and Sengupta, D and Sikka, DR and Swain, J and Vinayachandran, PN (2001) BOBMEX: The Bay of Bengal Monsoon Experiment. In: Bulletin of the American Meteorological Society, 82 (10). pp. 2217-2243.


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The first observational experiment under the Indian Climate Research Programme, called the Bay of Bengal Monsoon Experiment (BOBMEX), was carried out during July-August 1999. BOBMEX was aimed at measurements of important variables of the atmosphere, ocean, and their interface to gain deeper insight into some of the processes that govern the variability of organized convection over the bay. Simultaneous time series observations were carried out in the northern and southern Bay of Bengal from ships and moored buoys. About 80 scientists from 15 different institutions in India collaborated during BOBMEX to make observations in most-hostile conditions of the raging monsoon. In this paper, the objectives and the design of BOBMEX are described and some initial results presented. During the BOBMEX field phase there were several active spells of convection over the bay, separated by weak spells. Observation with high-resolution radiosondes, launched for the first time over the northern bay, showed that the magnitudes of the convective available potential energy (CA-PE) and the convective inhibition energy were comparable to those for the atmosphere over the west Pacific warm pool. CAPE decreased by 2-3 kJ kg(-1) following convection, and recovered in a time period of 1-2 days. The surface wind speed was generally higher than 8 m. s(-1). The thermohaline structure as well as its time evolution during the BOBMEX field phase were found to be different in the northern bay than in the southern bay. Over both the regions, the SST decreased during rain events and increased in cloud-free conditions. Over the season as a whole, the upper-layer salinity decreased for the north bay and increased for the south bay. The variation in SST during 1999 was found to be of smaller amplitude than in 1998. Further analysis of the surface fluxes and currents is expected to give insight into the nature of coupling.

Item Type: Journal Article
Publication: Bulletin of the American Meteorological Society
Publisher: American Meteorological Society
Additional Information: Copyright of this aritcle belongs to American Meteorological Soiety.
Department/Centre: Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Date Deposited: 16 Sep 2004
Last Modified: 19 Sep 2010 04:16
URI: http://eprints.iisc.ac.in/id/eprint/1859

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