10.1594/PANGAEA.990270Meyer-Kaiser, KirstinKirstinMeyer-Kaiser0000-0003-2219-6086Woods Hole Oceanographic InstitutionBergmann, MelanieMelanieBergmann0000-0001-5212-9808Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, BremerhavenPurser, AutunAutunPurser0000-0001-5427-0151Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, BremerhavenPANGAEA2026Event labelDate/Time of eventFile nameStonesAreaReference/sourceOcean Floor Observation SystemOcean Floor Observation and Bathymetry SystemOFOS photographic survey with BIIGLE analysisPS93.2PS107PS126Polarstern2015-07-31T21:23:00/2021-06-14T20:51:37Dataset10.1594/PANGAEA.89665510.1594/PANGAEA.8739971252 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalImages were recorded in transects at HAUSGARTEN station EG-IV in 2015, 2017, and 2021 using the OFOBS towed camera system. A set of 30 images were randomly selected from the beginning, middle, and end of the transects (total = 90 images per year). Images that were too bright, too dark, or outside the range 1.3 - 1.6 m above the seafloor were excluded from analysis. Stones in each image were annotated using the online program BIIGLE (biigle.de). Three red laser points in each image provided a size reference to calculate the surface area. The number of stones was divided by the surface area of each image to yield the density.-3.197399-2.9803378.7957378.90949North Greenland Sea