一个欧拉型污染物沉降的中尺度模式

An Eulerian Meso-scale Model on Deposition of Pollutants

本文提出了一个欧拉型的污染物中尺度数值模式,用以研究大气中污染物的输送、转化和干、湿沉降。模式以Anthes等人发展的中尺度气象模式为基础,加入了污染物质量守恒方程组。在方程中包括了源发射率、物质的平流和湍流输送和参数化的气相化学转化和干沉降。作为这一模式的特点是在三维的中尺度模式中嵌入一个一维时变的雨云物理和化学模块,用以研究污染物的湿沉降。用这个模式讨论了湿沉降规律和中国东部地区的污染物浓度和干湿沉降的分布。

In this paper, an Eulerian, meso-scale numerical model is presented to study the transportation, transformation, dry and wet deposition of pollutants in the atmosphere. Based on a meso-scale meteorological model, developed by Anthes, mass-conservation equations of pollutants are added in which the source emission rate, the advective and turbulent transport, the parameterized converting rate from sulfur dioxide to sulfate and the dry deposition rate of pollutants are included. As a distinguishing feature, this three dimensional. meso-scale model is inlaid with 'a one dimensional, time-dependent, physico-chemical model of cloud and precipitation as a module to evaluate the wet deposition of pollutants. Some numerical experiments and the distribution of concentration, dry and wet deposition of pollutants in Eastern China are presented.