A dataset of underwater passive acoustic recordings from a 2-year mooring deployment in Fram Strait (UNDER-ICE)

The UNDER-ICE acoustic thermometry experiment deployed 5 moorings in Fram Strait from 2014-2016. The mooring locations covered the central Fram Strait between 78° and 80° N and contained both mooring locations which were covered by sea ice most of the year and ice-free mooring locations. Each mooring consisted of a DSTAR control unit and of 10 hydrophones modules in an array configuration with a vertical distance of 9 m between hydrophones. Acoustic recordings from long deep-water moorings differ from bottom-mounted hydrophones as they can be influenced by noise from the mooring itself due to cable strumming in strong currents. An extensive quality control was therefore conducted with the data set. The fact that cable strumming correlates with strong currents and mooring pulldowns could be used to identify recordings that are potentially influenced by cable strumming. Quality flags denote which recordings are likely to be influenced by noise from cable strumming. Level 2 data from the experiment will be published as netcdf files containing noise level percentiles as a function of frequency. The netcdf files also contain all necessary metadata about the experiment and the processing.