Mean Dynamic Topography and Geostrophic Surface Currents in the Fram Strait Derived from Geodetic Data

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Two mean dynamic topography (MDT) fields are determined in the Fram Strait between Svalbard and Greenland. New airborne gravity anomalies, older data, and two different mean sea surface (MSS) fields are combined using the least squares collocation (LSC) technique. The results are compared to an oceanographic MDT model and two synthetic MDT fields. The same main currents are seen in all fields. Additionally, smaller scale features are revealed in the new MDT fields. Geostrophic surface currents derived from the MDT models are compared to moorings and Lagrangian drifters. The agreement is desultory. The oceanographic data are an inadequate basis of comparison due to data gaps. Nevertheless, it is the only one available.

Keywords: Fram Strait; Gravity; altimetry; dynamic topography; geostrophic surface currents

Document Type: Research Article


Affiliations: Department of Mathematical Sciences and Technology, Norwegian University of Life Sciences (UMB), ├ůs, Norway

Publication date: January 1, 2009

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