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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/39410

Title: Diel distribution and movement of sound scattering layer in Kuroshio waters, northeastern Taiwan
Authors: Ming-An Lee;Ming-Hsiu Chao;Jinn-Shing Weng;Yang-Chi Lan;Hsueh-Jung Lu
Contributors: 國立臺灣海洋大學:環境生物與漁業科學學系
Keywords: diel vertical movement;sound scattering layer;deep scattering layer;volume scattering strength;Kuroshio
Date: 2011-06
Issue Date: 2016-12-09T08:31:53Z
Publisher: Journal of Marine Science and Technology
Abstract: ABSTRACT:A 26-hr acoustic observation was carried out on board of the
“Ocean Research II” in the Kuroshio waters at 123°09.027'E,
25°05.019'N from August 4 to 5, 2007. Acoustic volume scattering
strengths (SVs) were collected by a scientific echo
sounder (EK500, 38 kHz) and diel variations of sound scattering
layer were analyzed. The maximum SV of surface scattering
layers (SSL) around 20~80 m was observed after dawn,
and mean SVs of SSL in nighttime was about -68 dB, 8 dB
higher than that of daytime. Two deep scattering layers (DSL)
were found in daytime at depth of 400~500 m and 600~700 m,
which resulted in mean SVs were about -72 dB and -78 dB,
respectively. Two clear diel vertical movements were also
detected from these two DSL. A part of these two DSL started
to ascend at dusk with a speed of 2.9 (±2.1) and 3.8 (±2.8)
cm/s, and stayed at 10 to 120 m at nighttime, while another
part of these DSL remained in the deep layer during daytime.
These two DSL started to descend at dawn with a speed of 2.0
(±1.1) to 4.0 (±3.8) cm/s, and then stayed at depth of 400~500
m and 600~700 m during daytime, respectively.
Relation: 19(3), pp.253-258
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/39410
Appears in Collections:[環境生物與漁業科學學系] 期刊論文

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