东海陆架环流季节变化的模拟与分析

Simulation and Analysis of Shelf Circulation and Its Seasonal Variability in the East China Sea

在改进POM模式基础上,建立1个中国东部海域斜压准预报模式,利用全球海洋模式结果并结合实测资料以及高精度卫星遥感SST资料,进行了东海陆架海域温盐及环流年循环的数值模拟,并系统分析了东海陆架环流系统及其季节变化、各暖流的路径等广为关注的问题。模式结果表明:黑潮主轴主体沿陆架坡折走向,中段黑潮流幅由南至北增宽,流速变大,流核所达深度变浅。浙闽沿岸流是一典型的季风环流,台湾暖流终年表现出东、北两分支结构,其分支表现出明显的季节性变化特征。在东海东北部陆架海域,冬季黑潮以其分支形式向北入侵,夏季则主要以大陆边缘流的形式向北进入陆架。论文对各暖流的水源也进行了相应的分析。

In this paper, based on an improved POM model, a baroclinic quasi prognostic model is built in the East China Sea. Using results of the global ocean model, some observation data and high accuracy remote SST data, the annual cycles of temperature, salinity and circulation are numerically simulated and some issues of wide interest, such as the shelf circulation system in the East China Sea and its seasonal variation and the paths of each warm current are analyzed. The results of the model show that the main axis of the Kuroshio in the East China Sea is along with the shelf break. The axis width becomes greater and greater from south to north with the velocity becoming greater and greater, while the current core becomes more shallow. The coast current along the Zhejiang and Fujian provinces is a typical monsoon circulation; the Taiwan Warm Current has two branches all the year round, which show obvious seasonal variations. In the northeastern shelf or in the East China Sea, the Kuroshio intrudes northward in the form of branches in winter, and enters into the shelf from the north as a continental margin current. The water sources of each warm current in the East China Sea are analyzed in detail.