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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-844
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
06 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Modeling the impact of chlorine emissions from coal combustion and prescribed waste incineration on tropospheric ozone formation in China
Yiming Liu1,2, Qi Fan1,2, Xiaoyang Chen1,2, Jun Zhao1,2, Zhenhao Ling1,2, Yingying Hong3, Weibiao Li1,2, Xunlai Chen4, Mingjie Wang4, and Xiaolin Wei4 1School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou, 510275, China
2Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Guangzhou, 510275, China
3Guangdong Ecological Meteorology Center, Guangzhou, 510640, China
4Shenzhen Key Laboratory of Severe Weather in South China, Shenzhen, 518040, China
Abstract. Chlorine radicals can enhance atmospheric oxidation which potentially increase tropospheric ozone concentration. However, few studies have been done to quantify the impact of chlorine emissions on ozone formation in China due to lack of chlorine emission inventory used in air quality model with sufficient resolution. In this study, Anthropogenic Chlorine Emissions Inventory for China (ACEIC) was developed for the first time, including emissions of hydrogen chloride (HCl) and molecular chlorine (Cl2) from coal combustion and prescribed waste incineration (waste incineration plant). The HCl and Cl2 emissions from coal combustion in China in 2012 were estimated to be 232.9 and 9.4 Gg, respectively, while HCl emission from prescribed waste incineration was estimated to be 2.9 Gg. Spatially high chlorine emissions were found in the North China Plain, the Yangtze River Delta and the Sichuan Basin. Air quality model simulations with the Community Multiscale Air Quality (CMAQ) modeling system were performed for November 2011 and the modeling results derived with and without chlorine emissions were compared. The magnitude of the simulated HCl, Cl2 and ClNO2 agreed reasonably with the observation when anthropogenic chlorine emissions were included in the model. The inclusion of the ACEIC increased the concentration of fine particulate Cl, leading to enhanced heterogeneous reactions between Cl and N2O5 which resulted in the higher production of ClNO2. Photolysis of ClNO2 and Cl2 in the morning and the reaction of HCl with OH in the afternoon produced chlorine radicals which accelerated tropospheric oxidation. When anthropogenic chlorine emissions were included in the model, the monthly mean concentrations of fine particulate Cl, daily maximum 1-h ClNO2 and Cl radicals were estimated to increase by up to about 2.0 μg m−3, 773 pptv and 1.5 × 103 molecule cm−3 in China, respectively. Meanwhile, the monthly mean daily maximum 1-h O3 concentration was found to increase by up to 2.2 ppbv (3.8 %), while the monthly mean NOx concentration decreased by up to 0.5 ppbv (6.1 %). The anthropogenic chlorine emissions potentially increased the 1-h O3 concentration by up to 7.7 ppbv in China. This study highlights the need for the inclusion of anthropogenic chlorine emission on air quality modeling and demonstrated its importance on tropospheric ozone formation.

Citation: Liu, Y., Fan, Q., Chen, X., Zhao, J., Ling, Z., Hong, Y., Li, W., Chen, X., Wang, M., and Wei, X.: Modeling the impact of chlorine emissions from coal combustion and prescribed waste incineration on tropospheric ozone formation in China, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-844, in review, 2017.
Yiming Liu et al.
Yiming Liu et al.

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Short summary
We develop the Anthropogenic Chlorine Emission Inventory for China (ACEIC) for the first time, including the emissions of HCl and Cl2 from coal combustion and prescribed waste incineration. We incorporate the ACEIC into the CMAQ model and find that it potentially increases the 1-h O3 concentration by up to ~ 8 ppbv in China. This study highlights the need for the inclusion of anthropogenic chlorine emission on air quality modeling and demonstrates its importance on tropospheric O3 formation.
We develop the Anthropogenic Chlorine Emission Inventory for China (ACEIC) for the first time,...
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