Dust aerosol radiative effect and influence on urban atmospheric boundary layer

Abstract

An 1.5-level-closure and 3-D non-stationary atmospheric boundary layer (ABL) model and a radiation transfer model with the output of Weather Research and Forecast (WRF) Model and lidar AML-1 are employed to simulate the dust aerosol radiative 5 effect and its influence on ABL in Beijing for the period of 2326 January 2002 when a dust storm occurred. The simulation shows that daytime dust aerosol radiative effect heats up the ABL at the mean rate of about 0.68 K/h. The horizontal wind speed from ground to 900m layer is also overall increased, and the value changes about 0.01 m/s at 14:00 LT near the ground. At night, the dust aerosol radiative effect cools the ABL 10 at the mean rate of 0.21 K/h and the wind speed lowers down at about 0.19 m/s at 02:00 LT near the ground.