10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
Abstract View
New Method to Modeling Heterogeneous Reaction of SO2 during Haze in China
SHUPING ZHANG, Jia Xing, Biwu Chu, Hong He, Golam Sarwar, Kebin He, Yan Zhao, RCEES, CAS, China
Abstract Number: 518 Working Group: Aerosol Modeling
Abstract In recent years, haze in China has been a hot topic in the study of aerosol chemistry and modeling, while the simulation of heterogeneous sulfate formation is still a big challenge. Literature suggests that different studies used different parameterized methods and heterogeneous oxidation rate of SO2, which limits application of the haze modeling. To address that issue, this study developed a parameterization using experimental results that are more direct and approximate to the haze generation conditions in China, based on the linear interpolation of the literature uptake coefficient. After summarizing the relevant coefficient of uptake, a series of experiments are conducted to investigate the heterogeneous uptake of SO2 under the atmospheric reaction condition of different relative humidity with the coexistence of NH3 and NO2 on the real dust surface. The uptake coefficient under different relative humidity in CMAQ model is parameterized based on the experimental results. We establish a parametric approach to model the heterogeneous oxidation of SO2 to sulfate under the coexistence of NH3 using the more direct experimental data. This parameterization method can improve the model performance in the simulation of Beijing sulfate in winter 2014 by 9.18%. The heterogeneous oxidation of SO2 in the presence of NH3 can contribute to 17% of the sulfate concentration during periods of heavy pollution.