Assessments of recently released global geopotential models along the Red Sea with shipborne gravity data

Abstract

The goal of this research is to assess the accuracy of the global geopotential models (GGMs) from 2018 until the present in the Red Sea. The assessment was done by using the gravitationalspectral analysis of models with each other and with the comparison with the shipborne gravity anomalies gathered along the Red Sea. In this study, combined models such as (XGM2019e 2159, SGG-UGM 2 and SGG-UGM 1) and satellite-only models such as (GOSG01S, IGGT R1C, Grace02k, DIR R6, GOCO06s, TIM R6 and Grace2018s) are studied. Firstly, all studied GGMs were subjected to gravitationalspectral analysis. The statistical results indicate that the combined models outperform the satellite-only models before overcoming the spectral gap. The DIR R6 model is the most reliable of the satellite-only GGMs investigated in this study, exhibiting superior behaviour in all aspects when compared to the other satellite-only GGMs. In addition, the SGG-UGM 2 model is the best of the combined model of this research. Nonetheless, The DIR R6 model showed the best results in band gravitational analysis with spectral enhancement technique.