Some salient features of the atmosphere observed over the north Bay of Bengal during BOBMEX

Bhat, G. S. (2003) Some salient features of the atmosphere observed over the north Bay of Bengal during BOBMEX Proceedings of the Indian Academy of Sciences - Earth and Planetary Sciences, 112 (2). pp. 131-146. ISSN 0253-4126

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This paper describes the near surface characteristics; vertical variations based on the observations made at 7.5° N; 89° E from ORV Sagar Kanya in the north Bay of Bengal during the Bay of Bengal Monsoon Experiment (BOBMEX) carried out in July-August 999. BOBMEX captured both the active; weak phases of convection. SST remained above the convection threshold throughout the BOBMEX. While the response of the SST to atmospheric forcing was clearly observed; the response of the atmosphere to SST changes was not clear. SST decreased during periods of large scale precipitation; increased during a weak phase of convection. It is shown that the latent heat flux at comparable wind speeds was about 5-50% lower over the Bay during BOBMEX compared to that over the Indian Ocean during other seasons; tropical west Pacific. On the other hand; the largest variations in the surface daily net heat flux are observed over the Bay during BOBMEX. SST predicted using observed surface fluxes showed that -D heat balance model works sometime but not always; horizontal advection is important. The high resolution Vaisala radiosondes launched during BOBMEX could clearly bring out the changes in the vertical structure of the atmosphere between active; weak phases of convection. Convective Available Potential Energy of the surface air decreased by - kJ kg-1 following convection; recovered in a time period of one or two days. The mid tropospheric relative humidity; water vapor content; wind direction show the major changes between the active; weak phases of convection

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Monsoon; Air-sea Coupling; Tropical Convection; Boundary Layer
ID Code:2482
Deposited On:08 Oct 2010 07:12
Last Modified:16 May 2016 13:28

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