| 南海主要分潮振幅变化趋势再探 |
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| 引用本文： | 于茜,潘海东,吕咸青.南海主要分潮振幅变化趋势再探[J].海洋学报,2022,44(5):62-70. |
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| 作者姓名： | 于茜 潘海东 吕咸青 |
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| 作者单位： | 1.中国海洋大学 物理海洋学教育部重点实验室, 山东 青岛 266100 |
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| 基金项目： | 青岛市博士后应用研究项目;国家自然科学基金;国家重点研发计划 |
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| 摘 要： | 潮汐变化研究对于沿海地区海洋工程、洪涝灾害预防和海洋资源开发利用等各方面都有着非常重要的意义。之前的潮汐变化研究主要基于多年逐时验潮站观测，而验潮站数据无论是站点的个数还是站点的位置，都存在很大的局限性，这对我们研究海盆尺度的潮汐变化规律形成了一定程度的阻碍。前人基于25年的T/P-Jason卫星高度计数据发现南海中央深海海盆主要分潮振幅存在异常大的趋势，这是由于中尺度海洋运动对潮汐调和分析干扰导致的虚假结果。本文首次使用了X-TRACK软件处理过的长达27年的T/P-Jason卫星高度计观测来研究整个南海的主要分潮振幅的长期趋势。经过X-TRACK处理后的卫星观测数据在整个南海的准确性和完整性都有了显著的提升。同时，我们使用了权重最小二乘法来消除长周期采样导致的潮汐混淆的影响。我们发现在南海大部分海域，4大主要分潮的振幅都存在显著的变化趋势。振幅和迟角变化的极值主要分布在吕宋海峡西部、马六甲海峡和台湾海峡等水深和岸线变化剧烈的近海海域，振幅最大的上升趋势可达2.75 mm/a，振幅最大的下降趋势可达–2.16 mm/a。南海主要分潮振幅的长期趋势与河流径流以及人类活动密切相关。
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| 关 键 词： | 南海 潮汐长期趋势 X-TRACK 卫星高度计 S_TIDE |
| 收稿时间： | 2021-07-18 |
The study of the trends of tidal amplitudes of major constituents in the South China Sea: A revisit |
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| Yu Qian,Pan Haidong,Lü Xianqing.The study of the trends of tidal amplitudes of major constituents in the South China Sea: A revisit[J].Acta Oceanologica Sinica (in Chinese),2022,44(5):62-70. |
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| Authors: | Yu Qian Pan Haidong Lü Xianqing |
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| Abstract: | The research of tidal changes is vital to ocean engineering, the protection of flooding as well as the utilization of ocean resources in coastal areas. Previous studies are mainly based on long-term hourly tide gauges whose number and location are highly limited. Previous study indicated that the long-term trends of tidal amplitudes are abnormally large in the central deep basin of the South China Sea (SCS) based on 25-year satellite altimeter data, which is not realistic and the resultant of the interference of ocean mesoscale variability on tidal harmonic analysis. In this paper, we use 27-year T/P-Jason satellite altimeter data processed by X-TRACK software to study the long-term tidal trends in the SCS. The satellite altimeter data processed by X-TRACK obviously improves the accuracy and completeness of satellite data in the SCS. Meanwhile, the weighted least square method is used to eliminate the effect of tidal aliasing caused by long period sampling. We find that in most areas of the SCS, the amplitudes of four major tidal constituents have significant long-term trends. The significant positive and negative long-term trends of amplitudes and phases are mainly distributed in the coastal areas such as the western Luzon Strait, the Strait of Malacca and Taiwan Strait, where the water depth and shoreline change dramatically. The largest positive long-term trend of amplitudes can reach 2.75 mm/a and the largest negative long-term trend of amplitudes can reach ?2.16 mm/a. The long-term trends of tidal amplitudes in the SCS should be related to river flow and human interference. |
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