Preprints
https://doi.org/10.5194/essd-2022-219
https://doi.org/10.5194/essd-2022-219
 
29 Jun 2022
29 Jun 2022
Status: this preprint is currently under review for the journal ESSD.

SDUST2021GRA: Global marine gravity anomaly model recovered from Ka-band and Ku-band satellite altimeter data

Chengcheng Zhu1,2, Jinyun Guo1, Jiajia Yuan1,3, Zhen Li1, Xin Liu1, and Jinyao Gao4 Chengcheng Zhu et al.
  • 1College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao, Shandong, China
  • 2School of Surveying and Geo-Informatics, Shandong Jianzhu University, Jinan, Shandong, China
  • 3School of Geomatics, Anhui University of Science and Technology, Huainan, Anhui, China
  • 4Second Institute of Oceanography of MNR, Hangzhou, Zhejiang, China

Abstract. With the launch of altimetry satellites with different observation frequencies and different survey missions, it is necessary to integrate multi-satellites altimeter data to establish a new global marine gravity anomaly model. Based on Ka-band SSHs from SARAL/AltiKA and Ku-band SSHs from other satellites (including HY-2A) in geodetic missions and exact repeat missions, the global marine gravity anomaly model of SDUST2021GRA on a 1′×1′ grid is derived. Gridded deflections of vertical (DOVs) are determined from along-track geoid gradients by the least-squares collocation method, in which the noise variances of along-track geoid gradients are obtained by the iteration method for Ka-band geodetic mission and by the SSH crossover discrepancies for other altimetry missions. SDUST2021GRA is recovered from the gridded DOVs by the inverse Vening-Meinesz formula, and analyzed by comparing with the recognized marine gravity anomaly models of DTU17 and SIO V30.1. Final, the accuracy of SDUST2021GRA, DTU17 and SIO V30.1 is assessed by preprocessed shipborne gravity anomalies. In conclusion, the differences between SDUST2021GRA and recognized models are small, indicating the reliability of SDUST2021GRA. The differences are mainly concentrated between -5 mGal and 5 mGal, which accounts for more than 95 % of the total number. Assessed by shipborne gravity, the accuracy of SDUST2021GRA is 2.37 mGal in the global, which is higher than that of DTU17 (2.74 mGal) and SIO V30.1(2.69 mGal). The precision advantage of SDUST2021GRA is mainly concentrated in offshore areas. SDUST2021GRA is concluded to reach an international advanced level for the altimeter-derived marine gravity model, especially in the offshore area. The SDUST2021GRA model are freely available at the site of https://doi.org/10.5281/zenodo.6668159 (Zhu et al., 2022).

Chengcheng Zhu et al.

Status: open (until 25 Aug 2022)

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  • RC1: 'Comment on essd-2022-219', Anonymous Referee #1, 09 Aug 2022 reply

Chengcheng Zhu et al.

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SDUST2021GRA: Global marine gravity anomaly model recovered from Ka-band and Ku-band satellite altimeter data Chengcheng Zhu; Jinyun Guo; Jiajia Yuan; Zhen Li; Xin Liu; Jinyao Gao https://doi.org/10.5281/zenodo.6668159

Chengcheng Zhu et al.

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Short summary
Accurate marine gravity anomalies play an important role in the fields of submarine topography, Earth structure and submarine exploitation. With the launch of different altimetry satellites, the density of altimeter data can meet the requirements of inversion of high-resolution and high-precision gravity anomaly models. We construct the global marine gravity anomaly model (SDUST2021GRA) whose accuracy is high, especially in the offshore area.