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Response of the upper layers of the northern and central Bay of Bengal to the atmospheric events during summer monsoon of 1999

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Title Response of the upper layers of the northern and central Bay of Bengal to the atmospheric events during summer monsoon of 1999
 
Creator Kumar, P V Hareesh
 
Subject BOBMEX-99
Bay of Bengal
Atmospheric systems
Thermohaline variability
Freshwater influx
Barrier layer
 
Description 715-723
Bay of Bengal Monsoon
Experiment (BOBMEX-99) provided valuable information on the influence of
atmospheric systems on the upper ocean thermohaline structure at 13oN,
87oE (TS1) and 17.5oN, 89oE (TS2). Two
stations, separated by 545 km, were selected based on the fact that the
occurrence of organized convection was high at both locations. From oceanographic
point of view, TS1 and TS2 were located within anti-cyclonic and cyclonic gyres
respectively, that shifted westward at a rate of 6.3 cm/sec. During the
BOBMEX-99 observational period, three systems were formed over the northern
BoB. Because of the proximity of TS2 to various systems, its influence was more
reflected on the atmospheric and oceanic parameters at this location than at
TS1. During the initial stages, atmospheric pressure at TS2 dropped by 3-6 mb

and the atmosphere and
the ocean surface cooled by 1.5 to 3oC and 0.35 to 0.85oC
respectively. Associated with the systems, thermal inversions of 0.1oC
to 0.15oC were observed at the base of isothermal layer. Surface
salinity dropped by 0.8 psu and 1.2 psu with the rainfall during 31 July-1
August (70 mm) and 15-6 August (>90 mm) respectively. The freshwater influx resulted
in the formation of a barrier layer at TS2, which showed a positive relation
thermal inversions. During BOBMEX-99 period, the systems were formed whenever
there was large positive salinity gradient; sea surface temperature exceeded 28.5oC
and heat content with respect to 28.3oC exceeded ~3107
Jm-2.
 
Date 2016-06-23T11:30:47Z
2016-06-23T11:30:47Z
2014-05
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/28757
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.43(5) [May 2014]