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DEEPEND: Raw acoustic scattering data of water column organisms collected during R/V Point Sur cruise PS21-13 (DP07), Gulf of Mexico, from 2021-04-30 to 2021-05-03

Authors: Boswell, Kevin
Published On: Dec 12 2023 22:53 UTC
DOI: https://doi.org/10.7266/83Y4BNXP
UDI: NO.x959.000:0013
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Project Information

Funded By:
National Oceanic and Atmospheric Administration

Research Group:
DEEPEND/RESTORE Trends and drivers of faunal abundance of the offshore Gulf of Mexico

Point of Contact

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

Data Collection Period
2021-04-30
to
2021-05-03
Theme keywords

Bathymetry, acoustic scattering, fish habitat, marine ecosystems, echosounder, ocean acoustics, Simrad EK80, fishes, pelagic habitat, marine habitat

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Abstract:

Patterns in acoustically-derived biological scatter through the water column were collected with multi-frequency scientific echosounders (Simrad EK80) operating at 18kHz, 38kHz, 70kHz, and 120kHz following protocols developed during the NOAA NRDA DAP data collection operations. Specifically, transducers were installed on a rigid pole mounted to the side of the ship and calibrated at sea for operating conditions following protocols developed by Dr. Kevin Boswell during the ONSAP/DAP cruises. The dynamics of the mesopelagic scattering community will be examined through the depth- dependent scattering responses at the 18 and 38 kHz frequencies, as well as through the difference between the mean volume backscattering strength (MVBS; in dB) at 18 kHz and 38 kHz (dMVBS(18-38)). In addition, scatterers in the upper water column (~150m) will be examined by analyzing all four available frequencies. Data were collected aboard the R/V Point Sur (PS21-13, DEEPEND DP07) between 2021-04-30 and 2021-05-03. This dataset is a result of research funded by the National Oceanic and Atmospheric Administration's RESTORE Science Program (ROR - https://ror.org/0042xzm63) under award #NA19NOS4510193 to Nova Southeastern University.

Suggested Citation:

Boswell, Kevin. 2023. DEEPEND: Raw acoustic scattering data of water column organisms collected during R/V Point Sur cruise PS21-13 (DP07), Gulf of Mexico, from 2021-04-30 to 2021-05-03. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/83Y4BNXP

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:

Acoustic scattering intensity (mean volume backscattering strength, [dB]).

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 two 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, D.A.; Berger, L.; Bernasconi, M.; Bethke, E.; Boswell, K.; Chu, D.; Domokos, R. et al. 2015. Calibration of acoustic instruments. ICES Cooperative Research Report No. 326, 133pp. DOI: http://dx.doi.org/10.25607/OBP-185