Martin Jakobsson / Alan Mix Multibeam bathymetry from the Petermann Fjord and adjacent Hall Basin, Northwest Greenland Bolin Centre Database 2019 Datafile Marine Bathymetry Multibeam bathymetry Greenland Petermann Glacier Earth science > Oceans > Marine geophysics Martin Jakobsson 2019-02-19T21:40:39+00:00 English 1.0 None The data was collected in a mixture of sea-ice conditions, ranging from 5/10 to 8/10 coverage. The multibeam echosounder installed in Oden is a Kongsberg EM122, 12 kHz (1x1°). Navigation was provided by a Seatex Seapath 320 without local augmentation as this is not available in the area. Sound speed correction was done regularly using data from a Seabird 911+ CTD (conductivity, temperature depth) or Valeport SVP (sound velocity profiler). The bathymetric data are provided as a processed grid with a cell-size resolution of 15x15 m on a polar stereographic projection, true scale 75° N. The horizontal datum is WGS84 and vertical datum is Mean Sea Level. The multibeam data are available in various formats: Fledermaus SD object files, ArcView ASCII files and netCDF files. The Petermann 2015 expedition focused on past variations of the ocean-ice-climate-sea level system to assess how the coupled system has responded to changing climate. Interagency and international collaborations included NSF, NASA, the British Antarctic Survey, UNAVCO, the Polar Geospatial Center (PGC), the Swedish Polar Research Secretarial, and the Geological Survey of Denmark and Greenland.