High-resolution bathymetry data from expedition SAS, Arctic Ocean, 2021

Caroline Bringensparr, Carlos Castro

Multibeam bathymetry from the central Arctic Ocean, including parts of Amundsen Basin, Nansen Basin, the North Pole, Lomonosov Ridge, Morris Jesup Rise and the Yermak Plateau.

High-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 Synoptic Arctic Survey 2021 (SAS2021) expedition.

The 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 100 m. The processing of the raw data was carried out using the Qimera software by QPS.

Citation

Caroline Bringensparr, Carlos Castro (2021) High-resolution bathymetry data from expedition SAS, Arctic Ocean, 2021. Dataset version 1. Bolin Centre Database. https://doi.org/10.17043/oden-sas-2021-bathymetry-1

References

Jakobsson M, Mayer LA, Bringensparr C, Castro CF, Mohammad R, Johnson P, Ketter T, Accettella D, Amblas D, An L, Arndt JE, Canals M, Casamor JL, Chauché N, Coakley B, Danielson S, Demarte M, Dickson M-L, Dorschel B, Dowdeswell JA, Dreutter S, Fremand AC, Gallant D, Hall JK, Hehemann L, Hodnesdal H, Hong J, Ivaldi R, Kane E, Klaucke I, Krawczyk DW, Kristoffersen Y, Kuipers BR, Millan R, Masetti G, Morlighem M, Noormets R, Prescott MM, Rebesco M, Rignot E, Semiletov I, Tate AJ, Travaglini P, Velicogna I, Weatherall P, Weinrebe W, Willis JK, Wood M, Zarayskaya Y, Zhang T, Zimmermann M, Zinglersen KB, (2020) The International Bathymetric Chart of the Arctic Ocean Version 4.0. Scientific Data 7:176. https://doi.org/10.1038/s41597-020-0520-9

Data

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Data description

The bathymetric data are provided as processed grids, with a grid cell size of 100 m. The grids are provided both in polar stereographic projection (IBCAO Polar Stereographic, EPSG 3996, true scale at 75 degrees north) and unprojected WGS 84 and in geographic coordinates (latitude and longitude). The horizontal datum is WGS 84 and the vertical datum is instantaneous sea level, implying that the vertical level has not been corrected for tides. For each projection, the bathymetric data grids are available in four formats: GeoTiff, netCDF, ASCII XYZ and ESRI Arc ASCII grid. Data are also illustrated as JPEG images.

Comments

The data were acquired in summer 2021 from Swedish icebreaker (IB) Oden during the SAS expedition. A Kongsberg EM122 1°⁠ × 1°⁠, 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’s 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.