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Response of the North Bay of Bengal (Head Bay) to monsoon depression during montblex-90

Seetaramayya, P and Nagar, SG and Mullan, AH (2001) Response of the North Bay of Bengal (Head Bay) to monsoon depression during montblex-90. Global Atmosphere and Ocean System, 7 (4). pp. 325-345.

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A case study of the Sea Surface Temperature (SST) variability in response to an incipient developing monsoon depression over the Head Bay of Bengal is presented here using one hourly marine meteorological data for SST, dry and wet bulb temperatures, mean sea level barometric pressure, wind field, and total cloud cover, collected on board ORV Sagar Kanya for the period 18 to 23 August 1990, at 20°N, 89°E. The results of the analysis of the above data have revealed that there is a steep rise in SST to 29.5°C in the wake of the monsoon trough when it swings from north into the Head Bay on 18 August. This spontaneous heating of the surface layer is observed to be due to the heating of direct solar radiation under clear skies in the trough. The SST is observed to have dropped by 1.1°C following the intensification of the depression and subsequent movement from the area. This loss in SST has been attributed to the loss of heat from the ocean to the atmosphere. The total loss at the sea surface observed is about 530 w/m 2 due to strong winds ( > 18 mps) in the wake of the depression. It is interesting to note that the SST has restored to 29°C immediately after the passage of the depression from the stationary position, implying strong solar heating in the rear of depression under clear skies. An examination of the transfer of momentum flux at the air-sea interface and the corresponding Bowen ratio values have revealed that the initial establishment of frictional convergence and the related heat transfer processes at the air-sea interface have played an important role in the ensuing convective development in the region.

Item Type: Article
Additional Information: Copyright of this article belongs to OPA
Uncontrolled Keywords: air-sea interaction; atmospheric pressure; feedback mechanism; monsoon; sea surface temperature, Bay of Bengal
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 26 Apr 2015 05:00
Last Modified: 26 Apr 2015 05:00

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