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《Chinese Journal of Atmospheric Sciences》 2011-01
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A Model Study of the Impact of Uncertainty in the Heterogeneous Uptake Coefficients on Dust Aerosol Surface

LI Jiawei1,2 and HAN Zhiwei1 1 Key Laboratory of Regional Climate-Environment for Temperate East Asia(RCE-TEA),Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029 2 Graduate University of Chinese Academy of Sciences,Beijing 100049  
The heterogeneous uptake coefficients(γ) taken from recent laboratory studies are analyzed in terms of aerosol sample,experiment method,and analysis method.The reference γ which are theoretically more suitable for Asian dust aerosol are derived and applied in a regional air quality model to represent heterogeneous reactions of dust aerosol in East Asia.In order to explore the sensitivity of model results to γ values,two sensitivity experiments,namely T-up(upper limit) and T-low(lower limit),are conducted based on the upper and lower limits of γ values for four gaseous species(HNO3,N2O5,O3,and SO2).T-rh experiment is also conducted to investigate the influence of relative humidity on γ values for HNO3 and N2O5.Model results using reference γ values are generally better than those using upper and lower limits of γ values in comparison with observations.This study also shows that it would be more reasonable to take γ as a function of relative humidity than to take it as a constant.Through heterogeneous reactions,dust aerosol can make the average concentrations of SO2,NOx,and O3 decrease by 3.44%,5.92%,and 1.75%,respectively,while those of sulfate and nitrate increase by 5.22% and 23.25% below 3 km within the model domain,showing heterogeneous reactions exert more influence on aerosols than gases.The percentages could be changed when using different γ values,especially ozone and nitrate.The model results of ozone and nitrate can differ by 13.4% and 10.1% between T-up and T-low.
【Fund】: 国家重点基础研究发展计划项目2006CB403703;; 中国科学院知识创新工程重要方向项目KZCX2-YW-Q11-03
【CateGory Index】: P402
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