https://scholars.lib.ntu.edu.tw/handle/123456789/606363
標題: | Gravity recovery from SWOT altimetry using geoid height and geoid gradient | 作者: | Yu D Hwang C Andersen O.B Chang E.T.Y EMMY TSUI-YU CHANG |
關鍵字: | Geoid gradient;Geoid height;Inverse Stokes' integral;Inverse Vening-Meinesz formula;Marine gravity;South China Sea;Surface water and ocean topography (SWOT) mission;Data handling;Inverse problems;Random errors;Recovery;Surface waters;Systematic errors;Geoid heights;Gravity anomalies;Inverse stoke' integral;Inverse vening-meinesz formula;Ocean topography;Sea surface height;South China sea;Surface water and ocean topography mission;Topography;accuracy assessment;altimeter;data processing;error analysis;gravity anomaly;spatial resolution;tilt;Pacific Ocean | 公開日期: | 2021 | 卷: | 265 | 來源出版物: | Remote Sensing of Environment | 摘要: | The Surface Water and Ocean Topography (SWOT) altimeter mission can measure high-resolution wide-swath sea surface heights (SSHs) that may greatly improve the current accuracy and spatial resolution of marine gravity from nadir-looking altimeters. To investigate the potential of SWOT in recovering high-quality marine gravity and how SWOT observation errors should be treated to optimize the accuracy of gravity anomaly from SWOT observations, we create high-wavenumber SSH components from multi-beam depths in the northern South China Sea (SCS) and simulate SWOT SSH errors. To cross-validate gravity signals and avoid gravity errors from SWOT, we use two computational methods (inverse Vening-Meinesz formula, IVM and inverse Stokes' integral, ISM) and recommend separate optimal data processing strategies when using geoid gradients (GGs) and geoid heights (GHs) for gravity recovery. The use of GGs (for IVM) effectively eliminates systematic errors in gravity derivation. If GHs (for ISM) are used in gravity recovery, the tilt in wide-swath SSHs should be removed before gravity computation, and the recovered gravity must be filtered (post-processed) to avoid artificial gravity signals due to the SSH errors. Our assessments using mgal-accuracy shipborne gravity anomalies in the northern SCS show that multiple-cycle SWOT observations can deliver high-quality marine gravity anomalies. IVM is more robust than ISM in resisting random and systematic errors in SWOT. Our processing strategies can be used for the gravity validation of SSHs from SWOT's fast-sampling and science phases. ? 2021 The Authors |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85112860693&doi=10.1016%2fj.rse.2021.112650&partnerID=40&md5=3a59776ddc7ef2b41d73f96287d42fc4 https://scholars.lib.ntu.edu.tw/handle/123456789/606363 |
ISSN: | 00344257 | DOI: | 10.1016/j.rse.2021.112650 |
顯示於: | 海洋研究所 |
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