Hydroacoustic data EK60 Greenland Sea August-September 2017 ...
Hydroacoustic data were collected in the Greenland Sea from 22 August to 12 September 2017, onboard RV Dana. The Simrad® EK60 split-beam echosounder with hull-mounted transducers at 18kHz, 38 kHz and 120 kHz recorded data continuously during the cruise, except during the deployment of the WBAT. Acou...
| Main Authors: | , , , |
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| Format: | Dataset |
| Language: | English |
| Published: |
Canadian Cryospheric Information Network
2021
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.21963/13251 https://www.polardata.ca/pdcsearch?doi_id=13251 |
| Summary: | Hydroacoustic data were collected in the Greenland Sea from 22 August to 12 September 2017, onboard RV Dana. The Simrad® EK60 split-beam echosounder with hull-mounted transducers at 18kHz, 38 kHz and 120 kHz recorded data continuously during the cruise, except during the deployment of the WBAT. Acoustic data from the EK60 were analyzed following Bouchard et al. (2017). CTD (conductivity-temperature-depth) profiles were used to determine sound speed in water and the coefficient of sound absorption for the acoustic analysis. Echograms were scrutinized to discard noise. The difference in mean volume backscattering strength (ΔMVBS) at 38 and 120 kHz (ΔMVBS120–38) was then used to isolate the signal of fish in echo-integration cells of 5 minutes long by 5 m deep between 14.5 m and 100 m. Only cells with ΔMVBS120–38 ranging from -10 to 5 dB re 1 m-1 were kept for further analyses. Backscatter profiles of fish were then converted into density profiles (ind. m-3) and we assumed that most of the fish signal ... : Data used to document vertical profiles of ichthyoplankton in the Greenland Sea in August-September 2017, for inclusion in the following scientific article: Caroline Bouchard, Julek Chawarski, Maxime Geoffroy, Apasiri Klasmeier, Eva Friis Møller, Christian Mohn, Mette Dalgaard Agersted (accepted for publication) Interspecific competition and recruitment of age-0 fish in the Greenland Sea: the role of transport and preferred prey availability. Elementa: Science of the Anthropocene. ... |
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