Abstract:

The purpose of this paper is to determine the marine gravity anomalies acquired by Cryosat-2 satellite altimeter data for the Gulf of Tonkin in Vietnam. To achieve that purpose, a process of determining marine gravity anomalies from satellite altimeter data has been set up. Sea surface height obtained from satellite altimetry. We need to remove these components: 1. The long-wavelength Geoid height; 2. The mean dynamic topography; 3. The time-varying sea surface topography. We have the residual Geoid heights after removing the above mentioned ingredients. The residual gravity anomalies are determined by the least-squares collocation method. Finally, the long-wavelength gravity anomalies are restored by the Global Geopotential Models. The results of marine gravity anomalies in the Gulf of Tonkin in Vietnam are represented in the form of the grid 2' x 2'. These marine gravity anomalies are also compared to 58989 points of ship-measured. The results compare show that: The Standard deviation between the Cryosat-2 satellite-derived gravity anomalies and ship-measured gravity anomalies are ± 3.57 mGal