Method of Construction Gravity Anomaly in Coastal Region of China Using Cryosat2 Altimetric and Shipborne Data

Abstract:

Based on three and a half years of satellite altimetric GDR data of cryosat2, the deflection of the vertical grid were obtained by using sea surface height gradient data and the least square collocation method in coastal region of China. The inverse Vening Meinesz formula and the removerestore technique were adopted to get sea gravity anomaly in the interested region. After fusion with the shipborne gravity data,the precision of the constructed gravity anomaly was found to be from 2.75 mgal to 5.38 mgal and the mean value was from -0.21 mgal to 0.45 mgal. Compared with DTU13 gravity field model, the maximum mean value improvement was 12.98 mgal and standard deviation improvement was 3.4 mgal. Compared with the Sandwell V23.1 gravity field model, the maximum mean value improvement was 13.58 mgal and standard deviation improvement was 1.09 mgal.

Key words:Cryosat2; gravity anomaly; ailtimetry; shipborne gravity measurement