Global marine gravity anomalies from multi-satellite altimeter data

Abstract In this study, China’s first altimeter satellite Haiyang-2A (HY-2A) data combined observations from CryoSat-2, SARAL/AltiKa, and Jason-1&2 are used to calculate the global (60°S–60°N) marine deflections of vertical gravity anomalies named Global Marine Gravity Anomaly Version 1(GMGA1), with grid resolution 1? × 1?. The each derived gradients geoid height through least squares method. then merged by assigning different weights product based on their accuracy. Finally, obtained remove-restore results reveal that fused have an accuracy 0.4 arcsec in north component 0.8 east component. HY-2A’s contribution integrated is second only Cryosat-2. Jason-1/2 accounts for a large proportion components. Compared worldwide products such as DTU17, Sandwell & Smith V31.1, well values EGM2008, EIGEN-6C4 XGM2019e_2159, GMGA1 has around 3.3 mGal. By not using HY-2A data, precision reduced about 0.1 To further improve accuracy, seafloor topography information provide short wavelength anomaly. It verified South China Sea (112°E–119E°, 12°N–20°N) Parker formula. combining shipborne depth generated filtering technique, new version anomaly improvement mGal obtained. Graphical