Assessment of Radar Waveform Retracked Jason-2 Altimetry Sea Surface Heights Near Taiwan Coastal Ocean

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题名:	Assessment of Radar Waveform Retracked Jason-2 Altimetry Sea Surface Heights Near Taiwan Coastal Ocean
作者:	林立青;Kuo, Chung-Yen;Kao, Huan-Chin;Lee, Hyongki;Cheng, Kai-Chien;Lin, Li-Ching
贡献者:	地球科學學院地球科學前瞻應用研究中心
关键词:	Accuracy;Algorithms;Altimeters;Altimetry;coastal ocean;Comparative analysis;Gages;Gauges;Marine;Measurement;Oceans;Satellite altimetry;Thresholds;tide gauge;Tides;waveform retracking;Waveforms
日期:	2012-04-01
上传时间:	2026-04-23 11:25:37 (UTC+8)
出版者:	Taylor and Francis Ltd.;Philadelphia: Taylor & Francis Group
摘要:	摘要： This study focuses on assessing the accuracy of 20-Hz waveform retracked Jason-2 (J-2) altimetry sea surface heights (SSHs) in the vicinity of Taiwan by comparisons with the TOPEX/Poseidon (T/P) 10-Hz SSHs and sea level data from the Anping tide gauge. The study areas exhibit high, medium, and low amplitudes of ocean tides and contain diverse bathymetries with depths of 0-4000 m. The performance of Offset Center of Gravity (OCOG), threshold, modified threshold, and ice retrackers was examined by comparing the retracked SSHs with Earth Gravitational Model 2008 (EGM08) geoid via the use of the improvement percentages (IMPs). The results indicate that both altimetry measurements are significantly improved by waveform retracking techniques, with a maximum IMP of 46.6% for T/P and 82.0% for J-2, and the optimal achievement of retrackers is influenced by the characteristics of the study areas. In addition, valid retracked J-2 SSHs are much closer to shorelines than T/P. A comparison of retracked J-2 data with Anping tide gauge records reveals that applying the optimal retracking algorithms reduces the root mean squares of differences and increases the number of valid measurements. 出版者： Philadelphia: Taylor & Francis Group 出版日期： 2012-04 出處： Marine geodesy, 2012-04, Vol.35 (2), p.188-197 資源來源： EBSCOhost Academic Search Premier 版權： Copyright Taylor & Francis Group, LLC 2012 版權： Copyright Taylor & Francis Ltd. 2012 識別號： ISSN: 0149-0419 識別號： EISSN: 1521-060X 識別號： DOI: 10.1080/01490419.2011.637861
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