Dust aerosol radiative effect and influence on urban atmospheric boundary layer

L. Zhang (1, 2) , M. Chen (1, 2) , L. Li (3)

1 College of Atmospheric Sciences [Lanzhou]
2 Key Laboratory of Western China's Environmental Systems (Ministry of Education)
3 BCC - Beijing Climate Centre

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 effect and its influence on ABL in Beijing for the period of 23?26 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 900 m 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 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.

Domaines: Océan, Atmosphère

L. Zhang, M. Chen, L. Li. Dust aerosol radiative effect and influence on urban atmospheric boundary layer. Atmospheric Chemistry and Physics Discussions, 2007, 7 (6), pp.15565-15580. ⟨hal-00303161⟩