地面风诊断模式的数值试验和模拟

Numerical Experiments and Modeling by a Diagnostic Model of Surface Winds

本文用一个简化的一层地面风数值诊断模式，在台湾岛及海峡地区对６个个例进行了数值试验。结果表明，假定的地形影响层较厚时，地面流场中台湾岛周围的流线更趋于与地形线平行，地形效应更明显；地表粗糙度增大时，地面风向道时针偏转，风速减小；考虑非绝热加热后，地面流场中分流现象明显减弱，并在山脊附近形成辐合线，同时岛后辐合减弱甚至消失；而地形高度的动力作用则是分流、绕流和岛后辐合等现象的内在根源。在上述研究基础上，对同样个例进行了数值模拟。结果在一定程度上反映了实际风场。

In this paper, the numerical experiments by a one-level model of surface winds have been made for the Taiwan Strait area. The effect of topographic influence layer, surface roughness,topographic height and diabatic heating on the results has been studied. Based on the above studies,a numerical model is created. It is suggested that the model is better to simulate the surface winds field in the Taiwan strait area, and the selection of appropriate parameter value is helpful to modify modeling results.