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Regional Models

Arctic (ARCGP)


  Authors: R. Forsberg, S. Kenyon     Created: 2006    Resp: R. Forsberg  
      Status: PUBLIC    

Description:
This gravimetric geoid is computed in the framework of the Arctic Gravity Project (ArcGP). The gravity compilation of this project includes surface (ground, helicopter, and marine), airborne, and submarine data. Along with these data types, satellite altimetry has been collected over both the ice-free and ice-covered areas up to the limits of ERS-1 coverage. The geoid model has a grid spacing of 5' x 10' and it is referred to the WGS84 ellipsoid. It is determined from the available airborne and surface gravimetric data using a remove-restore technique. The reference global gravity model is EGM96 up to degree and order 360. The residual geoid contribution is computed bu using a spherical FFT technique with modified Stokes kernel (n< 36). Error estimates computed by least-squares collocation u sing a regional covariance function show standard deviations ranging from 5 to 66 cm, where standard deviations above 30 cm are related to areas with lack or poor data coverage. Other information and data on the Arctic Gravity Project can be found at http://earth-info.nga.mil/GandG/wgs84/agp/readme.html.

References:
R. Forsberg, S. Kenyon (2004).Gravity and geoid in the Arctic region - The northern polar gap now filled. Proc. of the 2nd International GOCE User Workshop, ESA SP-569.
R. Forsberg, H. Skourup, O.B. Andersen, P. Knudsen, S.W. Laxon, A. Ridout, J. Johannesen, F. Siegismund, C.C. Tscherning, D. Arabelos, A. Braun (2007). ARCGICE: Combination of spaceborne, airborne and in-situ gravity measurements in support of Arctic Sea-ice thickness mapping. Danish National Space Center, Technical Report No. 7, Copenhagen.

Arctic