陆面过程参数化模式的研究

在概述了近年来国内外陆面过程参数化研究的基础上,发展了一个改进的陆面过程参数化模式。该模式能被应用于地球表面不同土壤和植被类型的陆面过程的相互作用研究。在该模式中通过土壤结构参数和陆面过程湍流通量的参数化,可广泛应用于不同类型的区域。在模式中,大气-陆面系统包括3个子系统:近地层大气、冠层和土壤活跃层。土壤被分为4层,上两层分别相当于温度的日和季变化层,植被的根系活动也在这两层内,在最深层的温度和含水量是气候的平均值。发展的陆面过程参数化模式可应用于不同气候区域能量平衡和气候的模拟研究。对我国在该领域的研究,特别是在开发我国西北地区过程中的环境生态研究中具有重要的意义。

Study of Land-Surface Processes Parameterizations Model

In this paper, the study methods of land-s urface processes parameterizations model were summarized and established, which can be used to study the interaction between the land-surface physical processe s of soil and vegetation types which make up the Earth surface. In the model, im provements of soil structure parameterization and land-surface processes turbul ence flux parameterization under different underlying surfaces allowed an extend ed class of terrain types to be included. The air-land system consists of three components: the atmosphere near the surface, the canopy and the active layer of soil. The soil is divided into four layers: the upper two layers correspond to those respectively showing diurnal and seasonal variations of temperature, and t he root system of vegetation is evenly distributed in these two layers. Temperat ure and moisture in the deepest layer are left to keep their climatic means valu es. This assumption is much satisfactory when the simulation periods are not too extended. The land-surface processes parameterizations model is able to simula te the balance of energy for different climatic zones. It has particularly impor tant instruction for our country in the study of atmosphere, environment ecology and to exploit natural resources in developing northwest China.