Acoustic Doppler Current Profiler data and echosounder data (70 kHz and 120 kHz) recorded by bottom mounted NORTEK Signature100s at two locations in the Barents Sea and a third on the continental slope north-east of Svalbard.

Bottom mounted 150 kHz Acoustic Doppler Current Profile (ADCP) data, and 70 kHz and 120 kHz echosounder data from 3 individual moorings located in the Barents Sea (in the Kvitøya Trough and on the Grand Bank), and on the continental slope north-east of Svalbard. Data were collected within the framework of the Nansen Legacy project.

Key ADCP data variables are Velocity East, Velocity North and Velocity Up. The ADCPs were configured to sample at an interval of 2700 s over an averaging period of 180 s, and a depth bin size of 5 m. Orientation data were recorded by the internal altitude and heading reference sensors. Compass heading values are adjusted for the magnetic declination of the study area, using the World Magnetic Model of 2020. Processing of the ADCP data was performed using the Nortek Ocean Contour Software V.2.1 5. ADCP data with mean correlations over all beams of less than 50 % were removed as were data with a ‘percent good’ value of less than 50 %. See Cannaby et al. (2023) for further details.

Key echosounder data variables provided are Target Strength and Volume backscattering strength. Target strength (TS; dB referenced to 1 m2) and volume backscattering strength (Sv; dB referenced to 1 m-1) were obtained by converting the recorded squared amplitude values that result from internal processing of the raw data using the Nortek Ocean Contour software V.2.1.5. Echosounder data were recorded at 20 s intervals using a bin size of 0.75 m. See Cannaby et al., (2023) and Cutter et al., (2022) for further details. Raw unprocessed data is available on requested from the authors. The echosounder data are uncalibrated.

The dates and locations of each individual mooring are as follows:

M1 (Barents Sea - Kvitøya Trough)
M1-bio-1 - location: 79.589, 28.091, dates: 16.11.2019–28.09.2020, water depth: 259 m, mooring depth: 252 m.
M1-bio-2 - location: 79.589 28.088, dates: 22.02.2021–10.11.2021, water depth 259 m, mooring depth 245 m.

M5 (Barents Sea - Grand Bank)
M5-bio-1 location: 77.082 35.036, dates: 11.08.2019–28.09.2020, water depth: 147 m, mooring depth: 136 m.
M5-bio-2 location: 77.082 35.058, dates: 12.10.2020–07.11.2021, water depth: 144 m, mooring depth: 140 m.

AT800 (Barents Sea - Northern continental slope)
AT800-bio-1 - location: 81.548 30.839, dates: 23.11.2019–29.09.2020, water depth: 876 m, mooring depth: 400 m.
AT800-bio-2 - location: 81.548 30.839, dates: 30.09.2020–14.09.2021, water depth: 872 m, mooring depth: 453 m.