Acoustic .raw data files. Vertical acoustic profiles collected with a Wideband Autonomous Transceiver (WBAT) at 70 and 200 kHz (CW) in the Greenland Sea, August-September 2017.

Hydroacoustic data were collected at 17 stations in the Greenland Sea from 22 August to 12 September 2017, onboard RV Dana. A Wideband Autonomous Transceiver (WBAT; EK80 echosounder system, Simrad®) with 70 and 200 kHz split-beam transducers were mounted on a CTD (conductivity-temperature-depth) profiler and recorded vertical profiles down to ~1000 m depth (200 kHz descending, 70 kHz ascending). Transducers recorded narrowband acoustic data horizontally out to 100 m range. Data from the CTD were used to determine sound speed in water and the coefficient of sound absorption for the acoustic analysis and furthermore to obtain time at depth for the acoustic data. Acoustic data from the upper ~12 m of the water column were not available due to noise from the surface. Also, acoustic profiles measured at 70 kHz were often incomplete and data from the upper 30 m were often not available. We only used data collected at 200 kHz to estimate zooplankton abundances along the vertical profiles. Target strength (TS) of zooplankton were derived and acoustic backscatter profiles were converted into density profiles (ind. m-3).