The impact of deep internal tides on acoustic propagation

Author

Rajan, Subramaniam D. ; Lewis, James K. ; Stein, Peter J.

Author_Institution

Sci. Solutions, Inc, Nashua, NH, USA

Volume

3

fYear

2001

fDate

2001

Firstpage

1480

Abstract

Strong deep (~250 m) internal tides have been observed off the south shores of Oahu. These tides result in large fluctuations in temperature (6-8°C) on a semi-diurnal basis, and in turn change the sound speed structure of the region where present. The authors quantify the impact of these tidally-induced sound speed variations on sonar system performance. Examples include an ASW (Anti-Submarine Warfare) sonar and its ability to localize sources. Finally, they comment on the ability to specify the water column characteristics (temperature T and salinity S versus depth) using the U.S. Navy´s Modular Ocean Data Assimilation System (MODAS), including some limitations of MODAS in providing an estimate of the sound speed environment of a region with time

Keywords

oceanographic regions; oceanography; tides; underwater sound; AD 1994; AD 1995; Hawaii; North Pacific; Oahu; acoustic propagation; acoustics; deep internal tide; ocean; semi-diurnal variation; sound speed structure; underwater sound; Acoustic propagation; Data assimilation; Fluctuations; Numerical simulation; Ocean temperature; Sea surface; Sonar; System performance; Tides; Water;

fLanguage

English

Publisher

ieee

Conference_Titel

OCEANS, 2001. MTS/IEEE Conference and Exhibition

Conference_Location

Honolulu, HI

Print_ISBN

0-933957-28-9

Type

conf

DOI

10.1109/OCEANS.2001.968052

Filename

968052