Abundant NH3 in China Enhances Atmospheric HONO Production by Promoting the Heterogeneous Reaction of SO2 with NO2

Ge Shuangshuang; Wang Gehui; Zhang SiLi DapengXie YuningWu CanYuan QiChen JianminZhang Hongliang

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Abundant NH3 in China Enhances Atmospheric HONO Production by Promoting the Heterogeneous Reaction of SO2 with NO2

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High levels of HONO have frequently been observed in Chinese haze periods and underestimated by current models due to some unknown sources and formation mechanisms. Combining lab-chamber simulations and field measurements in Xi'an and Beijing, China, we found that NH3 can significantly promote HONO formation via the reduction-oxidation of SO2 with NO2 in the aqueous phase of hygroscopic particles (e.g., NaCl). Concentrations of HONO formed in the aerosol phase showed an exponential increase (R-2 = 0.91) with NH3 levels under the chamber conditions and a linear growth with NH3 levels in the two Chinese cities. The uptake coefficient of NO2 on NaCl particles ranged from 2.0 x 10(-5) to 1.7 x 10(-4), 3-4 orders of magnitude larger than that on water droplets. Our results further showed that HONO formed from the aerosol phase accounted for 4-33 of the total in the chamber, indicating that aerosol-phase formation is an important source of HONO in China, especially in haze periods. Since NH3, SO2, and NO2 abundantly coexist in China, the positive effect of NH3 on HONO formation could enhance the atmospheric oxidizing capacity in the country, causing severe secondary aerosol pollution. Our work suggests that NH3 emission control is imperative for mitigating air pollution in China.

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《Environmental Science & Technology: ES&T》 |2019年第24期|14339-14347|共9页
作者
Ge Shuangshuang; Wang Gehui; Zhang SiLi DapengXie YuningWu CanYuan QiChen JianminZhang Hongliang;
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作者单位

East China Normal Univ, Sch Geog Sci, Minist Educ, Key Lab Geog Informat Sci, Shanghai 200241, Peoples R China;

Zhejiang Univ, Sch Earth Sci, Hangzhou 310027, Zhejiang, Peoples R China;

Inst Ecochongming, 3663 N Zhongshan Rd, Shanghai 200062, Peoples R ChinaFudan Univ, Dept Environm Sci & Engn, Shanghai 200043, Peoples R China;

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正文语种英语
中图分类环境科学、安全科学;
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Abundant NH3 in China Enhances Atmospheric HONO Production by Promoting the Heterogeneous Reaction of SO2 with NO2

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