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Volume backscattering strength of ice krill (Euphausia crystallorophias) in the Amundsen Sea coastal polynya

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Title
Volume backscattering strength of ice krill (Euphausia crystallorophias) in the Amundsen Sea coastal polynya
Other Titles
남극 아문젠해 아이스 크릴의 음향산란특성
Authors
La, HyoungSul
Shin, Hyoung Chul
Lee, Sang H.
Kang, Donhyug
Lee, Hyungbeen
Keywords
Amundsen Sea; Antarctic krill; Acoustic identification; Coastal polynya; Euphausia crystallorophias; Ice krill; Volume backscattering strength
Issue Date
2016
Citation
La, HyoungSul, et al. 2016. "Volume backscattering strength of ice krill (Euphausia crystallorophias) in the Amundsen Sea coastal polynya". DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, 123(1): 86-91.
Abstract
Volume backscattering strength (Sv in dB re 1 m-1) of ice krill (Euphausia crystallorophias) was observed at two frequencies (38 and 120 kHz) with a calibrated split-beam echosounder system in the Amundsen Sea coastal polynya. The horizontal and vertical scattering layers in the upper 200 m of the water column were known with the existence of predominant ice krill (>95%) in this region. Acoustic identification using a two-frequency dB window between Sv at 38 and Sv at 120 kHz separated echoes originating from dominant ice krill from other zooplankton species. The frequency dependence of ice krill at 38 and 120 kHz was examined and the result presented that ice krill might have different acoustic characteristics from other Southern Ocean zooplankton species including Euphausia superba. This result could be applied to improve the ability of acoustic identification and precise density estimation of ice krill in the high-latitude coastal waters of Antarctica.
URI
http://repository.kopri.re.kr/handle/201206/7449
DOI
http://dx.doi.org/10.1016/j.dsr2.2015.05.018
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