湍流能量闭合法用于大气模式的初探

INVESTIGATION ON THE FEASIBILITY OF USING THE TURBULENT KINETIC ENERGY CLOSURE METHOD TO ATMOSPHERIC MODEL

湍流能量（TKE）闭合方案是近年来大气边界层（PBL）模式中技推崇的方法，它具有11－2阶精度。大气环流模式的计算容量和垂直网络限制，不允许PBL方案过份精细。本文对TKE方案进行简化及网络稀疏化试验。并用Wangara资料验证。验证结果表明：此方案引入PBL内仅设置5层的大气环流模式是可行的。地面以上400米内模式结果与实测吻合。但中、上部位温计算值偏高。关于本方案在大尺度模式中的应用尚须进一步研究。

The turbulent kinetic energy(TKE)c1osure schemes with order precisionis recommended in planetary boundary layer(PBL)model in recent years. Because of the limi-tation of computing capacity and vertical grid numbers,the PBL closure scheme can not bevery fine. In this paper,it had be made that the TKE closure scheme is simplified and the vertical grid numbers is decreased. And this scheme has be used to simulate the Wangara experi-ment. The modeling results agree with observed data in 4oOm over.surface. It is shown thatthe scheme can be introduced to climate model in which there are 5 levels in the PBL. But,the cap-inversion layer of boundary layer top is smoothed. As a result,the modeling potentialtemperature of middle and upper levels are in the high side,and the surface sense heat fluxsimulated is in the low side.