黄海冷水团热结构及其环流解析研究

THEORETICAL STUDY ON THE THERMAL STRUCTURE AND CIRCULATION PATTERN RELATED TO COLD WATERMASS OF YELLOW SEA

本文从一般的流体动力学-热力学方程组出发,通过对历史资料的分析,确立了描述黄海冷水团热结构及其环流的非线性控制方程组,得出近似解析解。理论计算结果表明,夏季北黄海冷水团区域存在中心上升边缘下降的气旋式密度环流。

A theoretical study is made of the temperature distribution and the thermally induced circulation related to Cold Watermass of Yellow Sea (CWYS). Based on observed data, the governing equations are derived from the general.N-S equations through scale analysis.In the model, the heat conduction equation contains the local change term, vertical diffusion term and all the advection terms. The velocity components in the motion equations are determined by the horizontal or vertical thermal gradients. The temperature and velocity field are obtained by solving the coupled equations of motion and heat conduction, and the method of separation of variables is employed to solve the equations.Comparison between the theoretically calculated temperature and observed data show very good qualitative and quantitative agreements for the corresponding season. The circulation pattern obtained is found to be horizontally cyclonic round the cold center, with a vertically up-welling in the middle and downwelling in the marginal parts of CWYS.