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黑潮冲击东海陆架的动力学效应可分解为两部分,即黑潮水直接入侵和黑潮强剪切作用。此文研究了东海陆架水对黑潮水直接入侵的动力学响应。入侵黑潮水(下层水)与陆架水(上层水)形成两层层化流动,视陆架为扇形海域,且海底地形等深线也呈扇形分布,针对该浅海分层流,采用作者已导出的改进的涡度方程,利用极坐标及Fourier级数求解方法得到了解析解。结果表明黑潮水从台湾岛东北部冲入陆架下层一定距离后逐渐右转,然后沿扇形分布的等深线运动。该冲击流在台湾岛东北部形成下层海水的下沉和上层陆架水的涌升,从而给出了该冷涡生成机制的一种动力学解释。该海水涌升区与红外卫星照片中呈现的台湾岛东北部的冷涡位置是一致的。
The kinetic effect of the Kuroshio impact on the East China Sea shelf can be decomposed into two parts, that is, the direct intrusion of the Kuroshio and the strong shear of the Kuroshio. This paper studies the dynamic response of the East China Sea shelf water to the direct intrusion of Kuroshio water. The Kuroshio water (the lower water) and the shelf water (the upper water) form a two-layer stratified flow. The shelf is a fan-shaped sea area, and the isobath isobar has a fan-shaped distribution. For the shallow-sea stratified flow, The improved vorticity equation is obtained by using the method of polar coordinates and Fourier series. The results showed that the Kuroshio water rushed right into the lower shelf of the shelf from the northeastern part of Taiwan Island and then moved right along the isobath of the fan-shaped distribution. The impact of this impinging stream formed the sinking of the lower seawater and the rise of the upper shelf water in the northeast of Taiwan Island, giving a dynamic explanation of the formation mechanism of the cold vortex. The seawater surge area is consistent with the location of the cold vortex in northeastern Taiwan Island as shown in the photo of the infrared satellite.