Dataset Available Remotely Hosted

Raw acoustic scattering data of organisms from the water column collected aboard R/V Point Sur (cruise PS19-04/DP06) from 2018-07-19 to 2018-07-26

Authors: Boswell, Kevin
Published On: Aug 04 2021 18:26 UTC
DOI: https://doi.org/10.7266/n7-bhzk-nh73
UDI: R4.x257.000:0021
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Project Information

Funded By:
Gulf of Mexico Research Initiative

Funding Cycle:
RFP-IV

Research Group:
Deep-Pelagic Nekton Dynamics of the Gulf of Mexico (DEEPEND)

Point of Contact

Kevin Boswell
Florida International University / Marine Sciences Program
kevin.boswell@fiu.edu

Data Collection Period
2018-07-19
to
2018-07-26
Theme keywords

Bathymetry, Acoustic scattering, Fish habitat, Marine habitat, Fisheries, Pelagic habitat, echosounder, deep-sea nekton, Ocean Acoustics, Marine Ecosystems, Aquatic Ecosystems, Benthic, Seafloor Topography, Simrad EK80

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Abstract:

This dataset contains raw echosounder data collected aboard the R/V Point Sur cruise PS19-04 (DEEPEND cruise designation DP06) from 2018-07-19 to 2018-07-26. The Simrad EK80 echosounder, a multi-frequency scientific instrument was operated at 18 kHz, 38 kHz, 70 kHz, and 120 kHz, following protocols developed during the NOAA NRDA DAP data collection operations. The lower two frequencies allow the examination of the mesopelagic scattering community, while the top 150 m scatters may be examined using all four frequencies.

Suggested Citation:

Boswell, Kevin. 2021. Raw acoustic scattering data of organisms from the water column collected aboard R/V Point Sur (cruise PS19-04/DP06) from 2018-07-19 to 2018-07-26. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/n7-bhzk-nh73

Purpose:

To examine the spatial and temporal dynamics of deep sea nekton in the Gulf of Mexico through a multidisciplinary approach.

Data Parameters and Units:

The power within of the four frequencies. All frequencies were calibrated and updated on day one of the trip. Data included are in Simrad EK80 raw (.raw) format.

Methods:

Acoustic data were collected during the day and nighttime periods (defined by local sunrise and sunset) when the transducer was deployed, allowing for continuous surveys (~8 hours) during each transect at each station. The transducers were mounted in a faring and suspended 2.5 m below the water surface. Given the limitations of using a pole-mounted system, transects were conducted at an approximate vessel speed of 2 knots. Transducers were calibrated according to the standard sphere method (Demer et al., 2015).

Instruments:

Simrad EK80 Scientific Echosounder (http://www.simrad.com/ek80).

Provenance and Historical References:

Demer, David A., Laurent Berger, Matteo Bernasconi, Eckhard Bethke, Kevin Boswell, Dezhang Chu, Reka Domokos, Adam Dunford, Sascha Fassler, Stephane Gauthier, Lawrence T. Hufnagle, J. Michael Jech, Naigle Bouffant, Anne Lebourges-Dhaussy, Xavier Lurton, Gavin J. Macaulay, Yannick Perrot, Tim Ryan, Sandra Parker-Stetter, Sarah Stienessen, Thomas Weber, Neal Williamson. (2015) Calibration of acoustic instruments. ICES Cooperative Research Report No. 326, 133pp. DOI: http://dx.doi.org/10.25607/OBP-185