陆面过程模式BATS中地气通量计算方案的一个改进试验

在原有的陆面过程模式BATS中,对地表通量的计算基于简单的经验公式,这个计算是十分粗略的．而地气通量对各个气象要素的模拟都很重要,如动量通量会影响大气中的风速分布,热量通量会影响垂直方向上的温度分布而改变大气的层结稳定度,水汽通量则会改变空气中的水分含量和潜热,因而改进地气通量的计算精度是有必要的．为了提高地-气间通量计算的精度,在模式中增加稳定度的分类,将近地层稳定度分为5类,用中尺度气候模式RIEMS,分别对短期和中期模拟作了对比实验．经过比较和分析模拟结果,可以看出在增加稳定度的分类以后,模拟的各个气象要素场都较原来的有了改善．

An Experiment to Improve the Computation of the Surface Fluxes in the Land Surface Process Model BATS

In the known land surface model BATS,the calculations of the surface fluxes just depend on simple empirical formulae. These calculations are very sketchy. However, the land surface fluxes will greatly affect the simulations of every meteorological element. For example, the momentum fluxes will affect the distribution of wind speed, the heat fluxes can disturb the distribution of air temperature in the vertical direction, and the moisture fluxes will change the moisture in the air and latent heat. Therefore, it is necessary to improve these calculations.In order to improve the computation accuracy of the surface fluxes between the biosphere and the atmosphere, the stablility in the model is divided into 5 different types. To compare the results between the changed and the unchanged, experiments using mesoscale regional climate model RIEMS are done both for short_term simulations and medium_term simulations. Through comparing and analyzing the simulated results,we can conclude that the simulated meteorological fileds are apparently improved compared with the original simulated fileds.