不均匀植被分布对地表面和大气边界层影响的数值试验

研究陆地与大气间相互作用的方法之一是建立联系地表面层与大气间各种过程的数值模式进行模拟。本文是建立一个陆面过程与二维大气边界层相耦合的模式，耦合模式中包含了发生在大气边界层、植被冠层和土壤表层各种动力、热力和水文过程。运用这一模式模拟了荒漠环境中一片绿洲的不均匀地表面形成的局地气候。由于绿洲植被与周围荒漠有着显著不同的水份与能量平衡关系，使绿洲表面与边界层较四周荒漠冷而湿，并形成了相应的局地环流，即所谓“绿洲效应”。试验结果表明，模拟的气候状况与观测现象是一致的。模式可以用于陆气相互作用的研究。

Numerical Experiments of Influence of Heterogeneous Vegetation Distribution on the States of Surface and Atmospheric Boundary Layer

This paper attemps to develop a two -dimensional model with coupling land-surface processes and atmospheric planetary layer motion, in which, dynamical, thermal and hydrological processes taking place in the atmospheric boundary layer, canopy and surfaee laytr of soil are included. The local climate resulted from on oasis surrounded by desert is simulated with the coupled model. Due to significant dif ferences of water and energy budgets of oases and deserts, the colder and wetter air block over the oasis and corresponding circulation in the lower atmosphere is formed. It is called the "oasis efTect'. The' apoent of the simulation and observation indicates that the coupled model can be used to study the air-and interaction.