[{"title":"High-resolution bathymetry from the Ryder 2019 expedition to Northwest Greenland","summary":"Multibeam bathymetry from coastal waters along Northwestern Greenland, from Thule in the south to Sherard Osborn Fjord in the north. More specifically, mapped areas include Nares Strait, southern Lincoln Sea, Sherard Osborn Fjord (where Ryder Glacier drains), and Petermann Fjord (where Petermann Glacier drains). Detailed information about the depth and shape of the seafloor is provided by the acquired multibeam bathymetry.\r\n\r\nHigh-resolution bathymetry data are commonly used to study, for example, general seafloor geology, glacial morphology, bottom habitats, and bottom current activities. The data were collected from Swedish icebreaker Oden during the Ryder 2019 expedition.\r\n\r\nThe bathymetry is acquired with a multibeam echo-sounder. The data are provided in the form of a compiled Digital Terrain Model with a grid cell size of 15 m. The processing of the raw data was carried out using the Qimera software by QPS.","citations":"Jakobsson\u00a0, M., L. A. Mayer, J. Farrell, and Ryder 2019 Scientific Party (2020), SWEDARCTIC-Ryder 2019 Report, 1-455 pp, Swedish Polar Research Secretariat, ISBN 978-91-519-5132-4.\r\n","comments":"The data were acquired in August 2019 from Swedish icebreaker (IB) Oden during the Ryder 2019 expedition. A Kongsberg EM122 1\u00b0\u2060\u200a\u00d7\u200a1\u00b0\u2060, 12 kHz, multibeam echo-sounder was hull-mounted in IB Oden. Position, heading and attitude data were received from a Kongsberg-Seatex Seapath 320 navigation unit (GPS and GLONASS) with attached MRU5 motion sensor. The exact speed of sound at the multibeam transducers was provided by a Valeport Mini SVS\/T sound speed and temperature sensor mounted in the sea-chest in Oden\u2019s hull, close to the multibeam transducer arrays. This was interfaced with the multibeam system directly. In addition, sound speed profiles for the entire water column were provided by CTD (Conductivity, Temperature, Depth) stations as well as XBT (Expendable Bathy Thermograph) probes.\r\n\r\n\r\nThe data was collected in a mixture of sea-ice conditions, ranging from 5\/10 to 8\/10 coverage. 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).\r\n\r\n\r\nThe Ryder expedition started and ended in US Air Force Base Thule, Northwest Greenland, and lasted from August 5 to September 10, 2019. The main target was Sherard Osborn Fjord where Ryder Glaciers drains the north-western Greenland Ice Sheet. Included in the expedition survey areas were also Petermann Fjord and adjacent Hall Basin, northern Nares Strait and an area northeast of Ellesmere Island in the Lincoln Sea. It was an Explorers Club Flag Expedition carrying Flag #51. It was multidisciplinary with a broad range of data collected.","category":"Marine","subcategory":"Bathymetry","keywords":"Geophysics; Arctic Ocean; Bathymetry; Seafloor morphology; Multibeam; Greenland; Ryder Glacier; Ryder 2019 expedition; Icebreaker Oden","scientist":"Brian Calder, Bj\u00f6rn Eriksson, Kevin Jerram, Elizabeth Weidner, Felicity Holmes, Julia Muchowski, Abhay Prakash, Tamara Handl, Emelie St\u00e5hl, Larry Mayer, Martin Jakobsson","firstname":"Martin","lastname":"Jakobsson","address":"Department of Geological Sciences; Stockholm University\r\n","postalcode":"SE-106 91","city":"Stockholm","province":"","country":"Sweden","parameters":"Earth science > Oceans > Bathymetry\/seafloor topography","location":"Ocean > Arctic Ocean","progress":"Completed","language":"English","project":"Ryder 2019 expedition","publisher":"Bolin Centre Database","version":"1.0","constrains":"","access":"Free"}]