An Assessment of Recently Released High-Degree Global Geopotential Models Based on Heterogeneous Geodetic and Ocean Data

The development of the global geopotential model (GGM) broadens its applications in ocean science, which emphasizes importance for assessment. We assess recently released high-degree GGMs over South China Sea through heterogeneous geodetic observations and synthetic/ocean reanalysis data. comparisons with a high resolution (∼3 km) airborne gravimetric survey Paracel Islands show that XGM2019e_2159 has relatively quality, where standard deviation (SD) misfits against gravity data is ∼3.1 mGal. However, local airborne/shipborne hardly discriminate qualities other have or truncated to same expansion degree. Whereas, demonstrate values derived from different are not identical, ones better performances. SD between mean dynamic topography (MDT) 2.5 cm; this value changes 7.1 cm/s (6.8 cm/s) when associated zonal (meridian) geostrophic velocities assessed. In contrast, deteriorated compared those XGM2019e_2159. particular, contents computed widely used EGM2008 poor qualities, reduced by 3.9 cm MDT assessed, 4.0 (5.5 results suggest choice GGM oceanographic study crucial, especially coastal zones. Moreover, sets may be served as additional sources global/regional field assessment, useful regions lack high-quality