地气耦合模式中云和气溶胶温度效应的数值模拟

本文利用—维地气耦合模式研究了大气边界层气溶胶和云的气候效应。模拟结果表明,边界层内低云和气溶胶都能使地面和土壤温度下降;而低云还能使云下大气降温。当云和气溶胶并存时,气溶胶的作用不明显。云和气溶胶的温度效应不仅取决于它们的光学厚度和光学特性,还与下垫面的物理特性有关,沙漠下垫面所受的影响要比一般性裸土下垫面的大。

NUMERICAL MODELLING OF THE EFFECTS OF CLOUDS AND AEROSOLS ON TEMPERATURES IN A SOIL-AIR COUPLED MODEL

A soil-air coupled numerical model is used in this paper to study the effects of clouds and aerosols in the atmospheric boundary layer on temperatures. Results show that the temperatures at the ground surface and in the soil decrease due to the inclusion of aerosols into the boundary layer, low-level clouds also cools the subcloud atmosphere. When clouds and aerosols both exist,the aerosol effects are not obvious. The temperature effects of clouds and aerosols depend upon both their optical thickness and characteristics and the physical properties of the underlying surfaces. When the underlying surface is desert, it is affected more than any other common bare surfaces.