| Algorithm for Harmonic Tidal Analysis along T/P Tracks： Taking Differences of Observed Sea Surface Heights at Adjacent Points as Observations |
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| 作者单位： | [1]Department of Hydrography and Cartography, Dalian Naval Academy, 667 Jiefang Road, Dalian 116018, China [2]不详, Dalian Naval Academy, 667 Jiefang Road, Dalian 116018, China |
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| 基金项目： | Supported by the National Natural Science Foundation of China （No. 40671161） and the Open Research Fund Program of the Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, China（No.1469990324233-03-04）. |
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| 摘 要： | An algorithm （differential mode） is presented for the improvement of harmonic tidal analysis along T/P tracks, in which the differences between the observed sea surface heights at adjacent points are taken as observations. Also, the observation equations are constrained with the results of the crossover analysis; the parameter estimations are performed at 0.1° latitude intervals by the least squares. Cycle 10 to 330 T/P altimeter data covering the China Sea and the Northwest Pacific Ocean （2°-50° N,105°-150° E） are adopted for a refined along-track harmonic tidal analysis, and harmonic constants of 12 constituents in 8 474 points are obtained, which indicates that the algorithm can efficiently remove non-tidal effects in the altimeter observations, and improve the precision of tide parameters. Moreover, parameters along altimetry tracks represent a smoother distribution than those obtained by traditional algorithms. The root mean squares of the fitting errors between the tidal height model and the observations reduce from 11 cm to 1.3 cm.
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| 关 键 词： | 相邻海面高度差 观测量 沿迹调 分析方法 |
Algorithm for harmonic tidal analysis along T/P tracks: Taking differences of observed sea surface heights at adjacent points as observations |
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| Authors: | Xu Jun Bao Jingyang Liu Yanchun Yu Caixia |
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| Institution: | (1) Department of Hydrography and Cartography, Dalian Naval Academy, 667 Jiefang Road, Dalian, 116018, China |
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| Abstract: | An algorithm (differential mode) is presented for the improvement of harmonic tidal analysis along T/P tracks, in which the
differences between the observed sea surface heights at adjacent points are taken as observations. Also, the observation equations
are constrained with the results of the crossover analysis; the parameter estimations are performed at 0.1° latitude intervals
by the least squares. Cycle 10 to 330 T/P altimeter data covering the China Sea and the Northwest Pacific Ocean (2°–50°N,105°–150°E)
are adopted for a refined along-track harmonic tidal analysis, and harmonic constants of 12 constituents in 8 474 points are
obtained, which indicates that the algorithm can efficiently remove non-tidal effects in the altimeter observations, and improve
the precision of tide parameters. Moreover, parameters along altimetry tracks represent a smoother distribution than those
obtained by traditional algorithms. The root mean squares of the fitting errors between the tidal height model and the observations
reduce from 11 cm to 1.3 cm.
Supported by the National Natural Science Foundation of China (No. 40671161) and the Open Research Fund Program of the Key
Laboratory of Geospace Environment and Geodesy, Ministry of Education, China(No.1469990324233-03-04). |
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| Keywords: | satellite altimetry T/P harmonic tidal analysis differential mode |
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