| Altimetry-observed semi-annual cycle in the South China Sea: Real signal or alias of K1 tidal error? |
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| 引用本文： | 韩国启.Altimetry-observed semi-annual cycle in the South China Sea: Real signal or alias of K1 tidal error?[J].热带海洋学报,2009,28(5):1-5. |
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| 作者姓名： | 韩国启 |
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| 作者单位： | FisheriesandOceansCanada,NorthwestAtlanticFisheriesCentre,St.John’s,NL,A1C5X1Canada |
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| 基金项目： | Canadian Space Agency Government Research Initiative Program; NASA Ocean Surface Topography Science Team Program |
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| 摘 要： | There have been a number of applications of satellite altimetry to seasonal and interannual sea level variability in the South China Sea. However, these applications usually exclude shallow waters along the coast, with one of the concerns being large aliased tide-correction error. In this study the authors analyzed 14 years of merged satellite altimeter data to obtain the amplitude and phase of the semi-annual cycle and to examine the variation at the K1 alias frequency (close to the semi-annual frequency). The results indicate that the amplitude of the semi-annual cycle ranges from 3-7 cm, substantial compared with that of the annual cycle; while the amplitude at the K1 alias frequency (error of the K1 tidal correction) is essentially 1 cm only. Altimeter–derived semi-annual cycle is in good agreement with that from independent tide-gauge observations, pointing to the competent ability of satellite altimetry in observing semi-annual sea level variations in the South China Sea.
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| 关 键 词： | sea level semi-annual cycle satellite altimetry South China Sea |
| 收稿时间： | 2009-4-2 |
| 修稿时间： | 2009-7-9 |
Altimetry-observed semi-annual cycle in the South China Sea: Real signal or alias of K1 tidal error? |
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| HAN Guo-qi.Altimetry-observed semi-annual cycle in the South China Sea: Real signal or alias of K1 tidal error?[J].Journal of Tropical Oceanography,2009,28(5):1-5. |
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| Authors: | HAN Guo-qi |
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| Institution: | Fisheries and Oceans Canada, Northwest Atlantic Fisheries Centre, St. John’s, NL, A1C 5X1 Canada |
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| Abstract: | There have been a number of applications of satellite altimetry to seasonal and interannual sea level variability in the South China Sea. However, these applications usually exclude shallow waters along the coast, with one of the concerns being large aliased tide-correction error. In this study the authors analyzed 14 years of merged satellite altimeter data to obtain the amplitude and phase of the semi-annual cycle and to examine the variation at the K1 alias frequency (close to the semi-annual frequency). The results indicate that the amplitude of the semi-annual cycle ranges from 3-7 cm, substantial compared with that of the annual cycle; while the amplitude at the K1 alias frequency (error of the K1 tidal correction) is essentially 1 cm only. Altimeter–derived semi-annual cycle is in good agreement with that from independent tide-gauge observations, pointing to the competent ability of satellite altimetry in observing semi-annual sea level variations in the South China Sea. |
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| Keywords: | sea level semi-annual cycle satellite altimetry South China Sea |
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