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Improved Free-air Gravity Anomalies by Satellite Altimetry

  • Kim, Jeong-Woo (Dept. of Earth Sciences and Research Inst. of Geoinformatics & Geophysics Sejong University) ;
  • Roman, Daniel-R. (U.S.National Geodetic Survey)
  • Published : 2001.12.01

Abstract

Ocean satellite altimetry-implied free-air gravity anomalies have had the shortest wavelengths removed during the processing to generate the optimal solution between multiple radar altimeter missions. ERS-1 168day mission altimetry was residualized to a reference geoid surface generated by integrating Anderson & Knudsen’s free-air gravity anomalies for the Barents Sea. The altimetry tracks were reduced and filtered to extract the shortest wavelengths (between 4 and 111 km) from both ascending and descending tracks, respectively. These data were recombined using existing quadrant-swapping techniques in the wavenumber domain to generate a correlated, high frequency gravity field related to the local geologic sources. This added-value surface adjusted the reference free-air gravity anomalies to better reflect features in the gravity field at a wavelength related to the distance between altimetry ground tracks.

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References

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