NDLI: Acoustic intensity fluctuations induced by South China Sea internal tides and solitons

Content Provider	IEEE Xplore Digital Library
Author	Ching-Sang Chiu Ramp, S.R. Miller, C.W. Lynch, J.F. Duda, T.F. Tswen Yung Tang
Copyright Year	1976
Abstract	Between late April and May 23, 2001, a suite of acoustic and oceanographic sensors was deployed by a team of U.S., Taiwan, and Singapore scientists in the northeastern South China Sea to study the effects of ocean variability on low-frequency sound propagation in a shelfbreak environment. The primary acoustic receiver was an L-shaped hydrophone array moored on the continental shelf that monitored a variety of signals transmitted along and across the shelfbreak by moored sources. This paper discusses and contrasts the fluctuations in the 400-Hz signals transmitted across the shelfbreak and measured by the vertical segment of the listening array on two different days, one with the passage of several huge solitons that depressed the shallow isotherms to near the sea bottom and one with a much less energetic internal wavefield. In addition to exhibiting large and rapid temporal changes, the acoustic data show a much more vertically diffused sound intensity field as the huge solitons occupied and passed through the transmission path. Using a space-time continuous empirical sound-speed model based on the moored temperature records, the observed acoustic intensity fluctuations are explained using coupled-mode physics.
Sponsorship	IEEE Oceanic Engineering Society
Starting Page	1249
Ending Page	1263
Page Count	15
File Size	1369570
File Format	PDF
ISSN	03649059
Volume Number	29
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fluctuations Tides Solitons Acoustic sensors Oceans Acoustic propagation Sonar equipment Acoustic arrays Monitoring Acoustic measurements South China Sea (SCS) Intensity fluctuations nonlinear internal waves shallow-water acoustics
Content Type	Text
Resource Type	Article
Subject	Ocean Engineering Mechanical Engineering Electrical and Electronic Engineering

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Internal solitons in the northeastern south China Sea. Part I: sources and deep water propagation

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