ACPD Atmospheric Chemistry and Physics Discussions ACPD 1680-7375 Copernicus GmbH Göttingen, Germany 10.5194/acpd-7-15565-2007 Dust aerosol radiative effect and influence on urban atmospheric boundary layer Zhang L. 1 2 Chen M. 1 2 Li L. 3 College of Atmospheric Sciences, Lanzhou University, Lanzhou, 730000, China Key Laboratory of Western China's Environmental Systems (Ministry of Education), Lanzhou University, Lanzhou, 730000, China Beijing Regional Climate Center, Beijing Meteorological Bureau, Beijing, 100089, China 05 11 2007 7 6 15565 15580 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys-discuss.net/7/15565/2007/acpd-7-15565-2007.html The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/7/15565/2007/acpd-7-15565-2007.pdf

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.

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