Establishing a Marine Gravity Anomaly Database Using Saral - dp and Cryosat - 2 Altimetry Data: A Case Study of the Gulf of Tonkin, Vietnam

Le résumé fourni par la source

This study focuses on establishing a high - accuracy marine gravity anomaly database for the Gulf of Tonkin, Vietnam, utilizing satellite altimetry data in conjunction with GIS technology. The accurate determination of marine gravity anomalies is essential i n fields such as geodesy, geophysics, and marine resource management. However, traditional shipborne gravimetry methods often encounter significant limitations, including high costs, prolonged measurement times, and dependence on weather conditions, especi ally in complex near - shore areas. To overcome these limitations and enhance the accuracy in determining marine gravity anomalies, the authors applied satellite altimetry techniques, combined with the following key solutions : Combining data from 102 Cryosat - 2 satellite cycles (from October 24, 2010, to August 24, 2018, totaling 30,047 measurement points) and 92 SARAL - DP satellite cycles (from July 4, 2016, to April 28, 2025, totaling 28,636 measurement points) in Geodetic Missi on (GM) mode to significantly increase measurement point density. Selecting the XGM2019e global gravity field model and the DTU15MDT mean dynamic topography model, which were assessed as most suitable for Vietnam's geographical conditions. Employing the Least - Squares Collocation method to convert residual geoid heights into residual marine gravity anomalies. Experimental results demonstrate that the combination of data from these two satellites significantly increased measurement point density, achieving a resolution of 1’x1’, and notably improved the accuracy of marine gravity anomaly data in the Gulf of Tonk in. The accuracy of this new dataset reached ±2.05 mGal when evaluated by root mean square error, affirming the effectiveness and reliability of the applied methodology. This established marine gravity anomaly database will not only efficiently serve scien tific, technical, and geophysical tasks but also actively support marine resource management, protection of sovereignty over islands and seas, sustainable marine economic development, national defense and security assurance, and rational exploitation of ma rine resources in the study area .

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