Journal Article

Gravity anomalies determined from mean sea surface model data over the Gulf of Mexico

Li, Zhen, Zhu, Chengcheng, Chang, Xiaotao, Liu, Xin, Wei, Xuyang, Luo, Hongxin, Guo, Jinyun

2023

Overview

With the improvements in the density and quality of satellite altimetry data, a high-precision and high-resolution mean sea surface model containing abundant information regarding a marine gravity field can be calculated from long-time series multi-satellite altimeter data. Therefore, in this study, a method was proposed for determining marine gravity anomalies from a mean sea surface model. Taking the Gulf of Mexico (15°–32°N, 80°–100°W) as the study area and using a removal-recovery method, the residual gridded deflections of the vertical (DOVs) are calculated by combining the mean sea surface, mean dynamic topography, and XGM2019e_2159 geoid, and then using the inverse Vening-Meinesz method to determine the residual marine gravity anomalies from the residual gridded DOVs. Finally, residual gravity anomalies are added to the XGM2019e_2159 gravity anomalies to derive marine gravity anomaly models. In this study, the marine gravity anomalies were estimated with mean sea surface models CNES_CLS15MSS, DTU21MSS, and SDUST2020MSS and the mean dynamic topography models CNES_CLS18MDT and DTU22MDT. The accuracy of the marine gravity anomalies derived by the mean sea surface model was assessed based on ship-borne gravity data. The results show that the difference between the gravity anomalies derived by DTU21MSS and CNES_CLS18MDT and those of the ship-borne gravity data is optimal. With an increase in the distance from the coast, the difference between the gravity anomalies derived by mean sea surface models and ship-borne gravity data gradually decreases. The accuracy of the difference between the gravity anomalies derived by mean sea surface models and those from ship-borne gravity data are optimal at a depth of 3–4 km. The accuracy of the gravity anomalies derived by the mean sea surface model is high.

• Publisher: Springer Berlin Heidelberg,Springer Nature B.V,College of Geodesy and Geomatics,Shandong University of Science and Technology,Qingdao 266590,China%Land Satellite Remote Sensing Application Center,Ministry of Natural Resources,Beijing 100048,China%School of Surveying and Geo-Informatics,Shandong Jianzhu University,Jinan 250101,China
• Subject: Accuracy / Altimeters / Altimetry / Climatology / Depth perception / Dynamic topography / Earth and Environmental Science / Earth Sciences / Ecology / Engineering Fluid Dynamics / Environmental Chemistry / Geoid / Geoids / Gravitational fields / Gravity anomalies / Gravity data / Gravity field / Marine & Freshwater Sciences / Oceanography / Satellite altimetry / Sea surface / Topography