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Seasonality of Tides in Southeast Asian Waters

机译：东南亚水域的潮汐季节性

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摘要

An analysis of water level time series from 20 tide gauges in Southeast Asia finds that diurnal and semidiurnal astronomical tides exhibit strong seasonal variability of both amplitude and phase, which is not caused by known modulations of the astronomical tide-generating forces. Instead, it is found that the tidal properties are coherent with the western North Pacific monsoon index (WNPMI), indicating that monsoonal mechanisms are the likely cause. The study domain includes the Malacca Strait, Gulf of Thailand, the southern South China Sea, and Java Sea. The character of the geography and the tidal variability is different in each of these subregions. A new barotropic regional tide model is developed that incorporates the coupling between geostrophic currents, wind-driven (Ekman) currents, and tidal currents in the bottom boundary layer in order to examine the influence of these factors on tides. The dynamics thus preserve the frictional nonlinearities while neglecting advective nonlinearities and baroclinic tides, approximations that should be valid on the wide and shallow continental shelves in the study region. Themodel perturbation approach uses the climatological seasonal variability ofwind stress and geostrophic currents, which are prescribed singly and in combination in the model, to explain the observed tidal variability. Results are most successful in the southern Gulf of Thailand and near Singapore, where it is found that the combined effect of geostrophic and Ekman currents shows increased skill in reproducing the tidal variability than individual models. Ambiguous results at other locations suggest more localized processes such as river runoff.
机译：通过对东南亚20个潮汐仪的水位时间序列进行分析后发现，日和半日天文潮汐的振幅和相位都表现出强烈的季节性变化，这不是由已知的天文潮汐产生力调制引起的。取而代之的是，发现潮汐特性与北太平洋季风指数（WNPMI）相一致，表明可能是季风机制。研究领域包括马六甲海峡，泰国湾，南中国海南部和爪哇海。在每个子区域中，地理特征和潮汐变化都不同。为了研究这些因素对潮汐的影响，开发了一种新的正压区域潮汐模型，该模型结合了地转流，风（Ekman）流和潮汐流在底部边界层中的耦合。因此，动力学保留了摩擦非线性，而忽略了对流非线性和斜压潮，这些近似值在研究区域的宽而浅的大陆架上应该是有效的。该模型摄动法利用风应力和地转流的气候季节变化（在模型中单独规定并结合使用）来解释观测到的潮汐变化。结果在泰国湾南部和新加坡附近最为成功，在那里发现地转流和埃克曼流的综合作用显示出比单个模型更能再现潮汐变化的技巧。其他位置的模糊结果表明，河水径流等局部过程更为广泛。

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  • 来源
    《Journal of Physical Oceanography》 |2018年第5期|1169-1190|共22页
  • 作者

    Devlin Adam T.; Zaron Edward D.; Jay David A.; Talke Stefan A.; Pan Jiayi;

  • 作者单位

    Chinese Univ Hong Kong, Inst Space & Earth Informat Sci, Hong Kong, Hong Kong, Peoples R China;

    Portland State Univ, Dept Civil & Environm Engn, Portland, OR 97207 USA;

    Portland State Univ, Dept Civil & Environm Engn, Portland, OR 97207 USA;

    Portland State Univ, Dept Civil & Environm Engn, Portland, OR 97207 USA;

    Chinese Univ Hong Kong, Inst Space & Earth Informat Sci, Hong Kong, Hong Kong, Peoples R China;

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