【摘要】 用Green函数求解赤道附近定常运动线性化的正压方程组。得出平面上矩形区域内风场和自由面高度场的解析表达式。并就边界上纬向风速呈线性连续分布;只在东边界上加一经向波动的纬向风速分布和在北边界有波动的纬向速度分布等三种边界条件计算了风场,结果表明:β效应摩擦作用对低空急流的形成虽然很主要,但低空急流的轴线位置和低层风场的细微结构则和边界条件有关。只有第一种边界条件才能产生和实际情况比较一致的LLJ;其它两种边界条件和齐次边界条件都不能产生符合实际的结果。更多还原

【Abstract】 The steady linearized barotropic equations in the vicinity of the equator is solved by means of the Green function. We obtain the analytical expressions for the wind velocity and the height of the free surface within the rectangular region in the plane, and calculate respectively the wind field for each of the following three boundary condutions, i, e. (1) a linear continuous distribution of the zonal wind component on the boundary; (2) only a meridional wave of the zonal wind component on the eastern boundary. and (3) a wave disturbance of the zonal wind component on the northern boundary. The results indicate that the β effect and the frictional influence are truly fundamental to the initiation of the low level jet, but the position of the jet core and the micro structure of the low level wind field are correlated to the boundary conditions. Only under the first boundary condition, the LLJ incurred bear the resemblance to the Eastern African LLJ, and both the other two boundary conditions and the homogeneous boundary condition as well can not initiate the LLJ consistent with the actuality.更多还原