| || Arabian Sea Mini Warm Pool and its Influence on Acoustic Propagation
Author : Hareesh Kumar, P. V.;Sanilkumar, K. V.;Prasada Rao, C. V. K.
Source : Defence Science Journal ; Vol:57(1) ; 2007 ; pp 115-121
Subject : 53 Applied Physics;532 Fluid Mechanics
Keywords : Arabian Sea mini warm pool;Acoustic propagation model;Transmission loss;Acoustic propagation
Abstract : A systematic experiment was conducted in the eastern Arabian Sea for the first time exclusively to study the characteristics of the Arabian Sea mini warm pool1. The analysis revealed complex nature of the thermohaline and sonic layer distributions across the Arabian Sea mini warm pool. This mini warm pool was identified between 67.5 oE and 75 oE, where the sea surface temperature was in excess of 30.25 oC. At the core of this mini warm pool, warmer (>31.2 oC) and low saline (<34.6 PSU) waters were noticed. Further, very thin sonic layer (< 5 m) was noticed at the mini warm pool core, which increased eastward and westward. In this study, the acoustic propagation characteristics across and outside of the core, i.e., (i) within the mini warm pool core, (ii) eastern side of the mini warm pool core, and (iii) western side of the mini warm pool core, were assessed based on the output of a range-dependant acoustic model. In general, the occurrence of this mini warm pool was found to alter the propagation characteristics. Better propagation was obtained when the simulation was carried out on the eastern side of this mini warm pool, with source near the coast (i.e., downslope condition).