Improving the Accuracy of Seafloor Topography Inversion Based on a Variable Density and Topography Constraint Combined Modification Method
The use of satellite altimetry to recover marine gravity anomalies allows for the rapid acquisition of seafloor topography on a wide range of regional scales. Currently, the commonly used approaches for inverting seafloor topography have been focused on the linear correlation between gravity anomali...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-04-01
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| Series: | Journal of Marine Science and Engineering |
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| Online Access: | https://www.mdpi.com/2077-1312/11/4/853 |
| _version_ | 1797604799379668992 |
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| author | Yongjin Sun Wei Zheng Zhaowei Li Zhiquan Zhou Xiaocong Zhou |
| author_facet | Yongjin Sun Wei Zheng Zhaowei Li Zhiquan Zhou Xiaocong Zhou |
| author_sort | Yongjin Sun |
| collection | DOAJ |
| description | The use of satellite altimetry to recover marine gravity anomalies allows for the rapid acquisition of seafloor topography on a wide range of regional scales. Currently, the commonly used approaches for inverting seafloor topography have been focused on the linear correlation between gravity anomalies and seafloor topography and have disregarded the effect of density contrast between the crust and seawater on depth. Therefore, we proposed a variable density and topography constraint combined modification (VDTCCM) method by deriving Parker’s formula and the Bouguer plate formula by introducing variable density and topography factors. This method can effectively recover topography-related nonlinear terms of gravity anomalies. Subsequently, the seafloor topography of the South China Sea was estimated by applying the VDTCCM method and was defined as Seafloor topography one (ST1), and following, the accuracy was evaluated using shipborne sounding data (SSD). The results indicate that the ST1 model’s SSD-checked accuracy is 23.34% and 39.42% higher than the common international models of ETOPO1 and DTU10, respectively. Moreover, the ST1 model has advantages in mapping rugged areas, showing more detailed topographical features. Consequently, the VDTCCM method can provide beneficial references for the construction of seafloor topography models on a large regional scale using gravity anomalies recovered from satellite altimetry. |
| first_indexed | 2024-03-11T04:51:53Z |
| format | Article |
| id | doaj.art-45a119a71aba490f8ef9172429150a6e |
| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-03-11T04:51:53Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-45a119a71aba490f8ef9172429150a6e2023-11-17T19:56:58ZengMDPI AGJournal of Marine Science and Engineering2077-13122023-04-0111485310.3390/jmse11040853Improving the Accuracy of Seafloor Topography Inversion Based on a Variable Density and Topography Constraint Combined Modification MethodYongjin Sun0Wei Zheng1Zhaowei Li2Zhiquan Zhou3Xiaocong Zhou4China Academy of Aerospace Science and Innovation, China Aerospace Science and Technology Corporation, Beijing 100176, ChinaChina Academy of Aerospace Science and Innovation, China Aerospace Science and Technology Corporation, Beijing 100176, ChinaQian Xuesen Laboratory of Space Technology, China Academy of Space Technology, Beijing 100094, ChinaSchool of Information Science and Engineering, Harbin Institute of Technology, Weihai 264209, ChinaSchool of Automation, Nanjing University of Science and Technology, Nanjing 210094, ChinaThe use of satellite altimetry to recover marine gravity anomalies allows for the rapid acquisition of seafloor topography on a wide range of regional scales. Currently, the commonly used approaches for inverting seafloor topography have been focused on the linear correlation between gravity anomalies and seafloor topography and have disregarded the effect of density contrast between the crust and seawater on depth. Therefore, we proposed a variable density and topography constraint combined modification (VDTCCM) method by deriving Parker’s formula and the Bouguer plate formula by introducing variable density and topography factors. This method can effectively recover topography-related nonlinear terms of gravity anomalies. Subsequently, the seafloor topography of the South China Sea was estimated by applying the VDTCCM method and was defined as Seafloor topography one (ST1), and following, the accuracy was evaluated using shipborne sounding data (SSD). The results indicate that the ST1 model’s SSD-checked accuracy is 23.34% and 39.42% higher than the common international models of ETOPO1 and DTU10, respectively. Moreover, the ST1 model has advantages in mapping rugged areas, showing more detailed topographical features. Consequently, the VDTCCM method can provide beneficial references for the construction of seafloor topography models on a large regional scale using gravity anomalies recovered from satellite altimetry.https://www.mdpi.com/2077-1312/11/4/853VDTCCMseafloor topography inversionsatellite altimetrymarine gravity anomalySouth China Sea |
| spellingShingle | Yongjin Sun Wei Zheng Zhaowei Li Zhiquan Zhou Xiaocong Zhou Improving the Accuracy of Seafloor Topography Inversion Based on a Variable Density and Topography Constraint Combined Modification Method Journal of Marine Science and Engineering VDTCCM seafloor topography inversion satellite altimetry marine gravity anomaly South China Sea |
| title | Improving the Accuracy of Seafloor Topography Inversion Based on a Variable Density and Topography Constraint Combined Modification Method |
| title_full | Improving the Accuracy of Seafloor Topography Inversion Based on a Variable Density and Topography Constraint Combined Modification Method |
| title_fullStr | Improving the Accuracy of Seafloor Topography Inversion Based on a Variable Density and Topography Constraint Combined Modification Method |
| title_full_unstemmed | Improving the Accuracy of Seafloor Topography Inversion Based on a Variable Density and Topography Constraint Combined Modification Method |
| title_short | Improving the Accuracy of Seafloor Topography Inversion Based on a Variable Density and Topography Constraint Combined Modification Method |
| title_sort | improving the accuracy of seafloor topography inversion based on a variable density and topography constraint combined modification method |
| topic | VDTCCM seafloor topography inversion satellite altimetry marine gravity anomaly South China Sea |
| url | https://www.mdpi.com/2077-1312/11/4/853 |
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