Global High-Resolution Marine Gravity Field Product Fused from Altimetry-Derived Gravity and Shipborne Gravity (V1)

Based on the JAMSTEC local high-density ship gravity measurement in the western Pacific Ocean, the correspondence between the accuracy of the satellite altimetry-derived marine gravity model and water depth from SRTM15v2.4 model was established. Then, DTU21 and SIOv32.1, the new versions of the two most representative gravity field series models derived from satellite altimetry, were globally weighted fusion, and the special treatment in the polar region was used to generate a global high-resolution marine gravity field fusion product FUSION_V1.0. The product is a global gravity anomaly with 1'×1'  grid, covering 90 degrees of north-south latitude, longitude from 0 to 360 degrees. This product contains three variables, where the variable lon represents longitude in degrees; The variable lat represents latitude in degrees; The variable grav represents a two-dimensional gravity anomaly grid, measured in mGal. This product is expected to become an important component of the next generation of higher-resolution Earth Gravitational Model.