通过WRF(Weather Research and Forecasting) 模式嵌套包含了高云和气溶胶辐射效应的大气边界层模式, 结合激光雷达资料, 进行数值模拟, 定量分析高云和气溶胶辐射效应对城市边界层的影响。模式能很好地模拟出在高云和气溶胶辐射效应下城市边界层的特征。夜间, 气溶胶在低层起到保温作用, 高云使得保温作用得到加强, 地表增温达1.5 K。中高层, 气溶胶降低所在气层温度, 高云使得降温幅度减少, 降温达0.2～0.7 K。白天, 高云和气溶胶减少到达地面的太阳短波辐射, 导致低层温度降低, 地表降温达1.3 K。中高层, 气溶胶加热所在的气层, 高云使得这一增温幅度减少, 在500 m处增温最大, 达0.85 K。无论白天还是夜间, 气溶胶的辐射效应都会抵消一部分形成山谷风的热力条件, 使得中低层的风速减少, 这种影响在白天显得尤为明显。高云的存在使得这种抵消得到少量的补偿。
In order to indicate the influence of high cloud and the radiative effect of aerosol on the urban boundary layer, numerical simulation and lidar data are implemented by coupling the WRF (Weather Research and Forecasting) model and the ABL (Atmospheric Boundary Layer) model in which the influence of high cloud and aerosol radiative effect are considered. The model can present the character of urban boundary layer under the influence of high cloud and aerosol radiative effect. At night, aerosol keep warming at low levels, and high cloud increase the warming and induce surface temperature increase of 1.5 K. Aerosol keep cooling at middle and high levels, and high cloud decrease the cooling and induce temperature decrease of 0.2－0.7 K above 100 m. During the daytime, the combined action of high cloud and aerosol decreases the short wave radiation and results in surface temperature decrease of 1.3 K. Aerosol heats up at middle and high levels, high cloud decrease the heating, and the maximum temperature increasing value is 0.85 K and at 500 m. The aerosol radiative effect can counteract a part of mountain-valley breeze in the whole day, which will decrease the wind at middle and low levels. This effect of decrease is obvious during the daytime. High cloud makes a little compensation for the decrease of wind.