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首页> 外文期刊>Journal of oceanography >Coastal Disturbance in Sea Level Propagating along the South Coast of Japan and Its Impact on the Kuroshio
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Coastal Disturbance in Sea Level Propagating along the South Coast of Japan and Its Impact on the Kuroshio

机译：日本南海岸海平面传播的沿海扰动及其对黑潮的影响

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The coastal sea level propagating westward along the south coast of Japan and the impact of the disturbance on the generation of the Kuroshio small meander have been examined. The propagation occurs in sea level variations for periods shorter than 10 days and is remarkable for periods of 4-6 days. Characteristics of the 4-6 day component have been studied using the extended empirical orthogonal function (EEOF). The first and second modes of EEOF are almost in-phase throughout the south coast of Japan. The higher four modes of EEOF are significantly excited when the Kuroshio takes the non-large-meander path, and propagate westward with phase speeds of 2.8 m s~(-1) (third and fourth modes) and 1.6 m s~(-1) (fifth and sixth modes) in the Kuroshio region west of Mera in the Boso Peninsula. The analysis shows that more than 70% of the small meanders generate in two months after a significant propagating disturbance reaches south of Kyushu when the velocity of the Kuroshio is high. This effect of coastal disturbance is examined by numerical experiments with a 2.5-layer model in which coastal disturbance is excited by vertical displacement of the upper interface. The result is that offshore displacement of the Kuroshio occurs southeast of Kyushu only in the case of significant upward displacement of the interface under the influence of a high Kuroshio velocity. The significant coastal disturbance, which is associated with upward displacement of the density interface, and a high Kuroshio velocity can therefore be important factors in generating small meanders.
机译：研究了沿日本南海岸向西传播的沿海海平面以及扰动对黑潮小曲折产生的影响。传播发生在海平面变化短于10天的时间段内，在4-6天的时间段内显着。使用扩展的经验正交函数（EEOF）研究了4-6天分量的特征。 EEOF的第一和第二种模式在日本整个南海岸几乎是同相的。当黑潮采取非大弯矩路径时，EEOF的较高的四个模式被显着激发，并以2.8 ms〜（-1）（第三和第四模式）和1.6 ms〜（-1）的相速度向西传播。第五和第六种模式）在Boso半岛梅拉以西的黑潮地区。分析表明，当黑潮的速度很高时，在九州以南的大量传播扰动到达后两个月内，产生了70％以上的小弯道。通过使用2.5层模型的数值实验检查了海岸扰动的这种影响，在该模型中，海岸扰动是由上界面的垂直位移激发的。结果是，只有在黑潮速度高的影响下界面显着向上位移的情况下，黑潮的海上位移才会发生在九州的东南部。因此，严重的海岸扰动与密度界面的向上位移有关，而黑潮速度高可能是产生小曲折的重要因素。

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