High-resolution bathymetry data from expedition AGAVE, Arctic Ocean, 2007

Björn Eriksson

Multibeam bathymetry from areas in the central Artic Ocean with a main focus on the Gakkel Ridge.

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 Arctic Gakkel Vents (AGAVE) 2007 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 25⁠ – ⁠200 m. The processing of the raw data was carried out using the Qimera software by QPS.

Citation

Björn Eriksson (2021) High-resolution bathymetry data from expedition AGAVE, Arctic Ocean, 2007. Dataset version 1. Bolin Centre Database. https://doi.org/10.17043/oden-agave-2007-bathymetry-1

References

Sohn, R.A., Willis, C., Humphris, S., Shank, T., Singh, H., Edmonds, H.N., Kunz, C., Hedman, U., Helmke, E., Jakuba, M., Liljebladh, B., Linder, J., Murphy, C., Nakamura, K.-i., Sato, T., Schlindwein, V., Stranne, C., Tausenfreund, M., Upchurch, L., Winsor, P., Jakobsson, M., Soule, A., 2008. Explosive volcanism on the ultraslow-spreading Gakkel Ridge, Arctic Ocean. Nature 453, 1236-1238. https://doi.org/10.1038/nature07075

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

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Data description

The bathymetric data are provided as processed grids, divided into survey areas, with a grid cell size of 25⁠ – ⁠200 m. The grids are provided both in polar stereographic projection (IBCAO Polar Stereographic, EPSG 3996, true scale at 75 degrees north) and in geographic coordinates (WGS 84, 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 2007 from Swedish icebreaker (IB) Oden during the AGAVE 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.

The data were 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).

The AGAVE expedition started in Longyearbyen, Svalbard, and ended in Tromsø, Norway, and lasted from July 1 to August 10, 2007. The expedition represented an international collaboration between scientists in the United States, Sweden, Japan, and Germany, and was part of an International Polar Year (IPY) project entitled Biogeography and Geological Diversity of Hydrothermal Venting on the Ultra-Slow Spreading Arctic Mid-Ocean Ridge.