摘要
本文建立了二阶矩闭合的大气边界层数值模式,并模拟了Wangara资料第33天09:00—18:00时对流边界层的发展过程。计算结果与实测资料比较吻合,同时利用该模式研究了高阶矩模式模拟对流边界层的可行性,结果指出:二阶矩方程中的湍流扩散项对模拟对流边界层内的挟卷和反梯度现象起主要作用。而局地时间变化项仅影响对流边界层内的边界湍流扩散项。因此,假如处理好二阶矩方程中的湍流扩散项,高阶矩模式和大涡模式一样可以很好地模拟对流边界层的发生、发展。
In this paper, the atmospheric boundary layer model with the second order closure has been developed to simulate the daytime evoution of the atmospheric boundary layer observed on day 33 of Wangara boundary layer experiment. The calculated vertical profile of the mean wind and temperature are found to be in good with the observation. And this model has used to study the possibility of simulating the convective boundary layer with the higher order cloure model. It is found that the turbulent diffusion term in the second moments equation is very important to simulate the entraiment and the counter-gradient in the convective boundary layer, while the local time change term is only effeet the turbulent intensity. Therefore the higher-order closure model as well as the larg-eddy model will simulate the convertive boundary layer, if the turbulent diffusion term in the second moments equation is dosposed propriately.
出处
《气象科学》
CSCD
北大核心
1991年第2期130-143,共14页
Journal of the Meteorological Sciences
