Change of multifractal thermal characteristics in the western Philippine sea upper layer during internal wave-soliton propagation

Chu, Peter C.; Hsieh, Chung-Ping

doi:10.1007/s10872-007-0078-6

Cited by 8 publications

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“…The temporally invariant data in the upper layer (above 25 m) and the lower layer (below 140 m) was used for the whole observational period (07:52-09:36 GMT July 30, 2005). Thus, 424 temperature profiles from the surface to the bottom were obtained with temporal variation only between 25 and 140 m. Chu and Hsieh (2007b) identified the propagation of ISWs with a period of 7 min.…”

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confidence: 99%

“…They have been observed as sharp depressions of a near surface pycnocline that are often seen at the surface as alternating bands of slicks and rough patches (i.e., Apel et al, 1985;Chu and Hsieh, 2007b). The effect of ISWs on sound propagation has been investigated extensively in the continental shelves such as the Yellow Sea (Zhou and Zhang 1991) and north of Lisbon (Rodriguez et al 2000).…”

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Effect of Internal Solitary Waves on Underwater Acoustic Propagation

Chu¹,

Hsieh²

2010

mar technol soc j

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A B S T R A C TInternal solitary waves (ISWs) were observed on 07:52-09:36 GMT July 30, 2005, in the Philippine Sea near Taiwan from high-resolution temperature sampling. The effect of ISWs on acoustic propagation was identified using the Navy's Comprehensive Acoustic Simulation System through comparison between rangeindependent and range-dependent sound speed profiles. The ISWs enhance the sound propagation slightly (0-3 dB) in near-range, weaken or enhance the sound propagation (−20 to 20 dB) evidently in midrange, and always weaken the sound propagation (up to −20 dB) in far range. The ISW's effect on the acoustic propagation varies with sound frequency and sound source depth. This work provides a methodology to anticipate possible errors in transmission loss estimation in an operational framework, if no further additional data are available.

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