High efficiency of livestock ammonia emission controls in alleviating particulate nitrate during a severe winter haze episode in northern China

Xu, Zhenying; Liu, Mingxu; Zhang, Minsi; Song, Yu; Wang, Shuxiao; Zhang, Lin; Xu, Tingting; Wang, Tiantian; Yan, Caiqing; Zhou, Tian; Sun, Yele; Pan, Yuepeng; Hu, Min; Zheng, Mei; Zhu, Tong

Although nitrogen oxide (NOx) emission controls have been implemented for several years, northern China is still facing high particulate nitrate (NO3-) pollution during severe haze events in winter. In this study, the thermodynamic equilibrium model (ISORROPIA-II) and the Weather Research and Forecast model coupled with chemistry (WRF-Chem) were used to study the efficiency of NH3 emission controls on alleviating particulate NO3- during a severe winter haze episode. We found that particulate-NO3- formation is almost NH3-limited in extremely high pollution but HNO3-limited on the other days. The improvements in manure management of livestock husbandry could reduce 40 % of total NH3 emissions (currently 100 kt month−1) in northern China in winter. Consequently, particulate NO3- was reduced by approximately 40 % (on average from 40.8 to 25.7 µg m−3). Our results indicate that reducing livestock NH3 emissions would be highly effective in reducing particulate NO3- during severe winter haze events.

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Zitierform:

Xu, Zhenying / Liu, Mingxu / Zhang, Minsi / et al: High efficiency of livestock ammonia emission controls in alleviating particulate nitrate during a severe winter haze episode in northern China. 2019. Copernicus Publications.

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Rechteinhaber: Zhenying Xu et al.

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