一、前言海洋中的上升流,是海洋总环流中的一个组成部分。对于上升流的研究,在海洋科学研究和海洋经济开发等方面均具有重要的意义。因而受到海洋学者的重视。我国近海某些区域出现的上升流,早就引起海洋学者的关注。近年来,尤其对浙江近海上升流和东海东北部的气旋性涡旋研究较多。统观我国近海的上升流现象,发现有这样一些共同点:其一,这些上升流每年均出现在比较固定的位置上,范围较小,持续时间较长;其二,这些地区至海岸的距离较远,既非大洋,又非近岸,而是较为宽阔的陆架浅海,其深度多在100米以内,海底坡度较大。其中,有的上升流区的等深线比较直(如浙江、福建和广东近海),有的上升流区的海底向外海呈扇形倾斜,等深线廓线呈半圆形(如江苏近海的34°N,122°E附近和东海东北部)。具有上述特点的上升流何以产生的呢?众所周知,关于海洋中的升降流,有Hidake,Yoshida I. INTRODUCTION The upwelling in the ocean is an integral part of the general circulation of the oceans. The study of ascending flow is of great significance in marine scientific research and marine economic development. Therefore, the oceanographer’s attention. The upwelling that has emerged in some parts of the offshore China has long drawn the attention of oceanographers. In recent years, there are many studies on the cyclonic vortices in Zhejiang offshore upwelling and northeasterly East China Sea. Looking at the phenomenon of upwelling in China’s coastal waters, we find that there are some common ground: First, these upward currents occur in relatively fixed locations each year, with relatively small scope and longer duration. Second, the distance from these areas to the coast Far, neither ocean, nor nearshore, but rather broad shallow shelf of the shelf, the depth of more than 100 meters, the greater the slope of the sea. Among them, the isobaths of upwelling areas are relatively straight (such as Zhejiang, Fujian and Guangdong off-shore). Some of the upwelling areas have a fan-shaped seabed toward the outer sea with contour lines of a semicircle 34 ° N, 122 ° E and northeast of the East China Sea). Why does the upwelling with these characteristics produce? As we all know, about the ocean’s upwelling, Hidake, Yoshida