In:
The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 106, No. 4_Supplement ( 1999-10-01), p. 2117-2117
Abstract:
The theory of resonant scattering of sound by internal solitons in the Yellow Sea is well known [Zhou et al., J. Acoust. Soc. Am. 90, 2042–2054 (1991)]. However, the oceanographic measurements made were rather sparse. In this paper, the time dependencies and the vertical structures of the internal waves and the resulting sound speeds over a period of 49 h 49 min in a strong seasonal thermocline of the Yellow Sea are presented. A temperature chain, sampling once per 6.42 s and consisting of 32 sensors spaced 0.4 m apart, provides the data. It is found that the volume sound speeds are significantly perturbed in the presence of the internal waves. At a fixed depth, the sound-speed perturbations may exceed 45 ms−1. The mean sound-speed gradient is −8.3 s−1, but the gradient becomes −25 s−1 when the thermocline is the strongest. The sound-speed distributions show the diurnal periodicity of the internal wave activity. The 6-h component, with high-frequency fluctuations riding on top of it, is also clearly seen. However, the data give no evidence of the presence of solitons although the internal waves are indeed nonlinear. [Work supported by NSFC.]
Type of Medium:
Online Resource
ISSN:
0001-4966
,
1520-8524
Language:
English
Publisher:
Acoustical Society of America (ASA)
Publication Date:
1999
detail.hit.zdb_id:
1461063-2
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