COMPARISON OF METHODS FOR MARINE GRAVITY DETERMINATION FROM SATELLITEALTIMETRY DATA IN THE LABRADOR SEA

One-year average satellite altimetry data from the Exact Repeat Missio ns (ERM) of GEOSAT have been used to determine marine gravity disturba nces in the Labrador Sea region using the inverse Hotine approach with FFT techniques. The derived satellite gravity information has been co mpared to shipboard gravity as well as gravity information derived by least-squares collocation (LSC), GEMT3 and OSU91A geopotential models in the Orphan Knell area. The RMS and mean differences between satelli te and shipboard gravity disturbances are about 8.0 and 2.8 mGal, resp ectively. There is no significantly difference between the results obt ained using FFT and LSC.