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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-731
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
05 Sep 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Air Quality and Climate Change, Topic 3 of the Model Inter-Comparison Study for Asia Phase III (MICS-Asia III), Part I: overview and model evaluation
Meng Gao1,2, Zhiwei Han3,4, Zirui Liu5, Meng Li6,13, Jinyuan Xin5, Zhining Tao7,8, Jiawei Li4, Jeong-Eon Kang9, Kan Huang10, Xinyi Dong10, Bingliang Zhuang11, Shu Li11, Baozhu Ge5, Qizhong Wu12, Yafang Cheng13, Yuesi Wang5, Hyo-Jung Lee9, Cheol-Hee Kim9, Joshua S. Fu10, Tijian Wang11, Mian Chin8, Jung-Hun Woo14, Qiang Zhang6, Zifa Wang4,5, and Gregory R. Carmichael1 1Center for Global and Regional Environmental Research, University of Iowa, Iowa City, IA, USA
2John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
3Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
4University of Chinese Academy of Sciences, Beijing 100049, China
5State Key Labor atory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences , Beijing, China
6Ministry of Education Key Laboratory for Earth System Modeling, Center for Earth System Science, Tsinghua University, Beijing, China
7Universities Space Research Association, Columbia, MD, USA
8NASA Goddard Space Flight Center, Greenbelt, MD, USA
9Department of Atmospheric Sciences, Pusan National University, Busan, South Korea
10Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, TN, USA
11School of Atmospheric Sciences, Nanjing University, Nanjing, China
12College of Global Change and Earth System Science, Beijing Normal University, Beijing, China
13Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany
14Department of Advanced Technology Fusion, Konkuk University, Seoul, South Korea
Abstract. Topic 3 of the Model Inter-Comparison Study for Asia (MICS-Asia) Phase III examines how online coupled air quality models perform in simulating high aerosol pollution in the North China Plain region during wintertime haze events and evaluates the importance of aerosol radiative and microphysical feedbacks. A comprehensive overview of the MICS-ASIA III Topic 3 study design, including descriptions of participating models and model inputs, the experimental designs, and results of model evaluation, are presented. Two winter months (January 2010 and January 2013) were selected as study periods, when severe haze occurred in North China. Simulations were designed to evaluate radiative and microphysical feedbacks, together and separately, relative to simulations without feedbacks. Six modeling groups from China, Korea and the United States submitted results from seven applications of online coupled chemistry-meteorology models. Results are compared to meteorology and air quality measurements, including the Campaign on Atmospheric Aerosol Research Network of China (CARE-China) network, and the Acid Deposition Monitoring Network in East Asia (EANET). The analysis focuses on model evaluations and aerosol effects on meteorology and air quality, and potentially other interesting topics, such as the impacts of model resolutions on aerosol-radiation-weather interactions. The model evaluations for January 2010 show that current online-coupled meteorology-chemistry model can generally well reproduced meteorological features and variations of major air pollutants, including aerosol concentrations. The correlation coefficients between multi-model ensemble mean and observed near-surface temperature, water vapor mixing ratio and wind speeds can reach as high as 0.99, 0.99 and 0.98. The correlation coefficients between multi-model ensemble mean and the CARE-China observed near-surface air pollutants range from 0.51 to 0.94 (0.51 for ozone and 0.94 for PM2.5). However, large discrepancies exist between simulated aerosol chemical compositions from different models, which is due to different parameterizations of chemical reactions. The coefficient of variation (standard deviation divided by average) can reach above 1.3 for sulfate in Beijing, and above 1.6 for nitrate and organic aerosol in coastal regions, indicating these compositions are less consistent from different models. During clean periods, simulated Aerosol Optical Depths (AOD) from different models are consistent, but peak values differ during severe haze event, which can be explained by the differences in simulated inorganic aerosol concentrations and the hygroscopic growth efficiency (affected by varied RH). These results provide some brief senses of how current online-coupled meteorology-chemistry models reproduce severe haze events, and some directions for future model improvements.

Citation: Gao, M., Han, Z., Liu, Z., Li, M., Xin, J., Tao, Z., Li, J., Kang, J.-E., Huang, K., Dong, X., Zhuang, B., Li, S., Ge, B., Wu, Q., Cheng, Y., Wang, Y., Lee, H.-J., Kim, C.-H., Fu, J. S., Wang, T., Chin, M., Woo, J.-H., Zhang, Q., Wang, Z., and Carmichael, G. R.: Air Quality and Climate Change, Topic 3 of the Model Inter-Comparison Study for Asia Phase III (MICS-Asia III), Part I: overview and model evaluation, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-731, in review, 2017.
Meng Gao et al.
Meng Gao et al.

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Short summary
Topic 3 of the Model Inter-Comparison Study for Asia (MICS-Asia) Phase III examines how online coupled air quality models perform in simulating high aerosol pollution in the North China Plain region during wintertime haze events and evaluates the importance of aerosol radiative and microphysical feedbacks. A comprehensive overview of the MICS-ASIA III Topic 3 study design is presented.
Topic 3 of the Model Inter-Comparison Study for Asia (MICS-Asia) Phase III examines how online...
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