Episode Simulation of Asian Dust Storms with an Air Quality Modeling System |
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| Authors: | GE Cui ZHANG Meigen HAN Zhiwei and LIU Yanju |
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| Institution: | State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Key Laboratory of Regional Climate--Environment Research for Temperate East Asia, Institute of Atmospheric Physics,Chinese Academy of Sciences, Beijing 100029,Department of Environmental Pollution Analysis and Control, Beijing Center for Physical and Chemical Analysis, Beijing 100089 |
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| Abstract: | A dust deflation module was developed and coupled with the air quality modeling system RAMS-CMAQ to simultaneously treat all
the major tropospheric aerosols (i.e., organic and black carbons, sulfate, nitrate, ammonia, soil dust, and sea salt). Then
the coupled system was applied to East Asia to simulate Asian dust aerosol generation, transport and dry/wet removal processes
during 14–25 March 2002 when two strong dust storms occurred consecutively. To evaluate model performance and to analyze the
observed features of dust aerosols over the East Asian region, model results were compared to concentrations of suspended
particulate matter of 10 μm or less (PM10; 1-h intervals) at four remote Japanese stations and daily air pollution index (API) values for PM10 at four large Chinese cities. The modeled values were generally in good agreement with observed data, and the model reasonably
reproduced two dust storm outbreaks and generally predicted the dust onset and cessation times at each observation site. In
addition, hourly averaged values of aerosol optical thickness (AOT) were calculated and compared with observations at four
Aerosol Robotic Network (AERONET) stations to assess the model’s capability of estimating dust aerosol column burden. Analysis
shows that modeled and observed AOT values were generally comparable and that the contribution of dust aerosols to AOT was
significant only with regard to their source regions and their transport paths. |
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| Keywords: | aerosol aerosol optical thickness (AOT) CMAQ PM10 |
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