黄海西南部陆架锋区锋断面环流数值模拟

NUMERICAL SIMULATION OF CROSS FRONT IN THE SHELF FRONT AREA OF SOUTH-WESTERN YELLOW SEA

浅水陆架锋是近岸混合区与外海层化区的分界面,对近海海雾形成、渔业生产及污染扩散有重要影响。赵保仁根据实测SST资料利用Simpson-Hunter参量提出黄海沿岸区域存在潮混合控制的浅水陆架锋,他还进一步指出,黄海沿陆架锋与冷水团边界区是黄海的主要上升流区,即锋面上升流区,夏季黄海西部沿岸存在沿冷水团锋面南下的强流。James用这一诊断模型讨论过锋区环流情况,Garret等用的是半诊断模型。他们均得出垂直于锋面的断面内在锋区附近存在着双环流结构。

This paper is to diagnostically simulated the circulation structure across the front near 34°N in the western Yellow Sea,in which field data measured in 1984 are employed. In this diagnostic model,the effects of topography, tide and wind are considered. Results show that (1) there is a suthern jet on the slope along the front,of which the velocity maximum is 7. 3 cm/s, (2) upwelling and downwelling exist in the front region, which'can reach 10-3cm/s, (3) in the stratified region, there is a northern current smaller than the southern jet, (4) the stream function in the section is of multi-cells pattern. Comparison between simulated results and measured data indicates that the circulation across the front is well simulated. The mechanism of upwelling in the front region is also explained.