Performance of HaiYang-2 Altimetric Data in Marine Gravity Research and a New Global Marine Gravity Model NSOAS22

Haiyang-2 (HY-2) missions have accumulated sea surface height (SSH) observations on a global scale for more than 10 years. Four satellites, HY-2A, HY-2B, HY-2C and HY-2D, provide even but differently distributed data, which play complementary role in marine gravity studies with other missions. Therefore, this paper evaluates the performances of HY-2 altimetric data modeling from following four perspectives: SSH accuracy, geoid signal resolution ability, vertical deflections anomaly. First, centimeter-magnitude accuracy level is proved by analyzing discrepancies at crossover points within certain time limit. Second, spectral analysis repetitive along-track sequences domain shows range 18 to 24 km. Taking exact repeat (ERM), example, could be remarkably enhanced stacking cycles. Third, validation an XGM2019 model showed that were reliably computed all missions, HY-2A performed slightly worse Meanwhile, HY-2D ~66° orbital inclination obviously had improved ability capture east–west signals compared HY-2B. Finally, we constructed results based three input datasets, dataset only, multi-satellite without HY-2. Validations using published models shipborne gravimetric data. The capable improving anomaly recoveries NSOAS22 incorporated comparable DTU21 SS V31.1. Furthermore, should not only construct 1’ × model.