Volume 12, No. 4, August 2012, Pages 615-628 PDF(5.13 MB)
Air Quality Modeling for of a Strong Dust Event in East Asia in March 2010
Xiao Han1, Cui Ge2, Jinhua Tao3, Meigen Zhang1, Renjian Zhang4
1 State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
2 Department of Earth and Atmospheric Sciences, University of Nebraska – Lincoln, NE, USA
3 State Key Laboratory of Remote Sensing Science, Jointly Sponsored by Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University, Beijing 100101, China
4 Key Laboratory of Regional Climate-Environment for East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
In 19 and 20 March 2010, the annual strongest dust event occurred over East Asia, for the reports from National Meteorological Center of CMA (China Meteorological Administration) showed that 16 provinces (cities) of China were affected by the dust storm, and the air pollution index (API) given by Ministry of Environment Protection of China exceeded 300 in 13 Chinese cities. An air quality modeling system RAMS-CMAQ was employed to simulate the spatial and temporal features of this dust event, and analyze its impacts on air quality and regional radiative effect in East Asia. The modeled mass concentrations and aerosol optical depth (AOD) of dust and other aerosol species are generally in good agreement with surface observations and satellite measurements. Numerical analysis shows that the dust storm generated over Mongolia and west of Inner Mongolia, and swept central, eastern and southern China, also including the East China Sea. The highest value of dust concentration exceeded 3000 μg/m3 in the source area and waved from 200 to 1000 μg/m3 in the downstream areas. The high AOD values mainly contributed by dust ranged from 0.5 to 1.5, which means the regional visibility and radiation would be significantly impacted by the dust particles. The direct radiative forcing of dust was also obviously strong with values from –5 to –30 W/m2 appeared over the regions where dust storm swept. This value is almost equal to the radiative effect of total aerosol components over these areas.
CMAQ; Asian dust event; AOD; Radiative forcing.