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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
Authors
La, Hyoung Sul
Lee, Hyungbeen
Kang, Donhyug
Lee, SangHoon
Shin, Hyoung Chul
Subject
Oceanography
Keywords
Amundsen Sea; Antarctic krill; Acoustic identification; Coastal polynya; Ice krill; Volume backscattering strength; Araon
Issue Date
2016
Citation
La, Hyoung Sul, et al. 2016. "Volume backscattering strength of ice krill (Euphausia crystallorophias) in the Amundsen Sea coastal polynya". Deep-Sea ResearchII, 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.
DOI
http://dx.doi.org/10.1016/j.dsr2.2015.05.018
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