Arabian Sea Mini Warm Pool and its Influenceon Acoustic Propagation

  • P.V. Hareesh Kumar Naval Physical & Oceanographic Laboratory, Kochi
  • K. V. Sanilkumar Naval Physical & Oceanographic Laboratory, Kochi
  • C.V.K. Prasada Rao Naval Physical & Oceanographic Laboratory, Kochi
Keywords: Arabian Sea mini warm pool, acoustic propagation model, transmission loss, acousticpropagation

Abstract

A systematic experiment was conducted in the eastern Arabian Sea for the first time exclusivelyto study the characteristics of the Arabian Sea mini warm pool1. The analysis revealed complexnature 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 temperaturewas 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 miniwarm pool core, which increased eastward and westward. In this study, the acoustic propagationcharacteristics across and outside of the core, i.e., (i) within the mini warm pool core, (ii) easternside of the mini warm pool core, and (iii) western side of the mini warm pool core, were assessedbased on the output of a range-dependant acoustic model. In general, the occurrence of this miniwarm pool was found to alter the propagation characteristics. Better propagation was obtainedwhen the simulation was carried out on the eastern side of this mini warm pool, with source nearthe coast (i.e., downslope condition)
Published
2007-01-01
How to Cite
KumarP., SanilkumarK., & RaoC. (2007). Arabian Sea Mini Warm Pool and its Influenceon Acoustic Propagation. Defence Science Journal, 57(1), 115-121. https://doi.org/10.14429/dsj.57.1738
Section
Applied Physics & Fluid Dynamics