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GRAVITY AND GEOID IN THE ARCTIC REGION - THE NORTHERN GOCE POLAR GAP FILLED

Rene Forsberg(1)and S Kenyon(2)

(1) KMS, Rentemestervej 8, DK2400 Copenhagen NV, Denmark
(2) NIMA, 3838 Vogel Rd., St. Louis MO., USA, Denmark

Abstract

The GOCE satellite gravity field mission will leave “polar gaps”, and to fill-in these gaps terrestrial and airborne gravity data will be essential. The Arctic Gravity Project, an international initiative involving eleven circumarctic countries, has recently completed the compilation of a gravity field on a 5x5’’ grid of the entire Arctic region north of 64°N. The project incorporated major new airborne surveys of the US Naval Research Laboratory, Scandinavian, German and Russian sources, as well as extensive surface data coverage for the Russian sector of the Arctic Ocean (VNIIO, St. Petersburg). Other data sources included submarine data (SCICEX cruises) that provided detail over many of the high frequency features in the Arctic and enhanced satellite altimetry over ice-covered areas. In the poster we describe the methodology used in the final compilation including the downward continuation of airborne gravity, modelling of the terrain and bathymetry, merging and combination techniques, and final data analysis and selection. An accuracy assessment of the Arctic gravity field has been performed, including comparisons with available satellite mission data from CHAMP and GRACE geopotential models. The Arctic Gravity Project includes free-air gravity anomalies, updated elevation and bathymetry data, Bouguer anomalies, and a precise geoid. An similar effort with new airborne gravity survey should also be undertaken in Antarctica, especially for the central south pole region, ideally coordinated by bodies like SCAR and IAG.

 

Full paper

Workshop poster

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry

GOCE04