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Fundamental research on the western boundary current induced by Rossby waves

罗斯贝波诱发的西边界流基础研究

基本信息

批准号：
16540401
负责人：
WAKATA Yoshinobu
金额：
$ 2.3万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

We investigate the interannual variability of Kuroshio volume transport using Ocean General Circulation Model and satellite altimeter data. It was found from the analysis in the middle latitude area that the Kuroshio volume transport can be understood from the propagation response of the baroclinic Rossby waves to the sea surface wind stress. However, this explanation was inapplicable in the area existing subtropical countercurrent owing to the effect of unstable waves.The headstream of Kuroshio Current continues to the north equatorial current in the area of which it was known that there are many equatorial waves such as Rossby wave and Kelvin wave. These waves may influence this headstream. The sea surface height (SSH) anomaly was separated into equatorial modes using satellite altimeter data. The power-spectral density (PSD) was obtained for the east-west wavenumber and frequency for each separated mode. The PSD distribution was compared with the theoretical dispersion curve for the … More equatorial modes derived by Matsuno (1966). The first Rossby modes have a high-density distribution that is slightly lower than the theoretical dispersion curve, but the Kelvin mode and the higher Rossby modes have high-density distribution that almost matches each dispersion curve. Results of analyses of satellite observational data show that wave motion near the equator mainly shows characteristics of equatorial waves, especially for a intraseasonal time scale.Seasonal variability of SSH in the East China Sea and the Yellow Sea was investigated through the study of model simulation and analysis of observed data. The model SSH was compared with the tide-gage data. The model SSH is also compared with the satellite altimeter data using Harmonic analysis, and they generally showed good agreement in wide area. The SSH is high in summer and low in winter. As a factor of this seasonal variability, SSH variability due to the thermal expansion was considered. The minimum appears in February and the maximum appears in September. However, the fluctuation range of model and altimeter data is about twice of this thermal expansion effect, and the time when the minimum appears is locally different. The dynamical effect due to the wind stress must be important. Winter monsoon burst extrudes the seawater from the northern marginal sea area. This may enhance the amplitude and advance the phase in this area. Less

本文利用海洋环流模式和卫星高度计资料研究了黑潮体积输送的年际变化。在中纬度地区，黑潮的体积输送可以从斜压Rossby波对海面风应力的传播响应来理解。但在副热带逆流存在的地区，由于不稳定波的影响，这种解释是不适用的，黑潮的源头一直延续到北赤道流，在该地区，已知有许多赤道波，如Rossby波和Kelvin波。这些波可能影响这个源头。利用卫星高度计资料，将海面高度异常分解为赤道模态。得到了每个分离模式的东西向波数和频率的功率谱密度（PSD）。将PSD分布与用于该聚合物的理论色散曲线进行比较。 ...更多信息 Matsuno（1966）导出的赤道模。第一Rossby模式具有比理论色散曲线略低的高密度分布，但是开尔文模式和更高的Rossby模式具有几乎与每个色散曲线匹配的高密度分布。卫星观测资料的分析结果表明，赤道附近的波动主要表现为赤道波动的特征，尤其是在季节内时间尺度上，通过模式模拟和观测资料的分析，研究了东、黄海SSH的季节变化。SSH模型与验潮资料进行了比较。利用调和分析将SSH模式与卫星高度计资料进行了比较，两者在大范围内基本一致。SSH夏季高，冬季低。作为这种季节性变化的一个因素，SSH的变化，由于热膨胀被认为是。最小值出现在2月，最大值出现在9月。但模式和高度计资料的起伏幅度大约是这种热膨胀效应的两倍，最小值出现的时间也有局部差异。风应力引起的动力效应一定很重要。冬季风爆发将海水从北方边缘海区挤出。这可能会增强该区域的振幅并提前相位。少