摘要
利用含地形、摩擦及非绝热加热外源强迫的准地转正压涡度方程模式 ,通过构造理想的坡地地形及椭圆型岛地形 ,首先分析了孤立地形的动力抬升作用及动力抬升、摩擦、非绝热加热 3者共同作用下对热带气旋 (TC)移动的影响。发现 :地形的动力抬升、摩擦作用以及地形附近海域的非绝热加热对TC移动均有影响 ;然后 ,引入了我国东南近海的实际地形 ,通过数值试验分析了TC移经或登陆在近海不同位置时TC移向、移速的可能变化 ,并给出了近海地形对TC移向、移速影响的空间分布。
A set of numerical experiments is made by using the barotropic vorticity equation with topography and friction and diabatic heating forcing. Firstly the effect of the ideal topographic slope and island on tropical cyclone movement is given. It shows that the dynamical lifting and friction of topography and the diabatic heating of sea near topography have significant impacts on tropical cyclone movement. Then introducing the actual topography near southeast China Sea, the potential change of tropical cyclone movement is analyzed. Finally the spatial distribution of the influence of topography near China Sea on tropical cyclone movement is given.
