气候变化领域集成服务门户(CCPortal): Changes of ammonia concentrations in wintertime on the North China Plain from 2018 to 2020

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DOI	10.1016/j.atmosres.2021.105490
	Changes of ammonia concentrations in wintertime on the North China Plain from 2018 to 2020
	He Y.; Pan Y.; Gu M.; Sun Q.; Zhang Q.; Zhang R.; Wang Y.
发表日期	2021
ISSN	0169-8095
卷号	253
英文摘要	The reduced economic and social activities during the Chinese Spring Festival provide a unique experiment to evaluate reductions in anthropogenic NH3 emissions in China. However, quantifying this unique scenario is challenging as meteorology may mask the real changes in observed NH3 concentrations. Here, we applied a machine learning technique to decouple the effects of meteorology and confirmed that the real (deweathered) NH3 concentration dropped to a minimum during the Spring Festival in 2019 and 2020 at both urban (Beijing) and rural (Xianghe) sites on the North China Plain. Compared with the scenario without the Spring Festival effect, we predicted that NH3 concentrations in 2020 were 39.8% and 24.6% higher than the observed values at the urban and rural sites, respectively. The significant difference between the two sites indicates a larger reduction in anthropogenic NH3 emissions in urban areas than in rural areas due to the Spring Festival and lockdown measures of COVID-19. Future control strategies should consider the emissions of NH3 from the transportation, industrial and residential sectors, considering that agricultural emissions are minor in cold seasons. © 2021 Elsevier B.V.
英文关键词	Air pollution; Ammonia emissions; Control strategy; COVID-19; Random forest model; Spring Festival
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236836
作者单位	State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; National Satellite Meteorological Center, China Meteorological Administration, Beijing, 100081, China; Key Laboratory of Middle Atmosphere and Global Environment Observation (LAGEO), Xianghe Observatory of Whole Atmosphere, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China
推荐引用方式 GB/T 7714	He Y.,Pan Y.,Gu M.,et al. Changes of ammonia concentrations in wintertime on the North China Plain from 2018 to 2020[J],2021,253.
APA	He Y..,Pan Y..,Gu M..,Sun Q..,Zhang Q..,...&Wang Y..(2021).Changes of ammonia concentrations in wintertime on the North China Plain from 2018 to 2020.Atmospheric Research,253.
MLA	He Y.,et al."Changes of ammonia concentrations in wintertime on the North China Plain from 2018 to 2020".Atmospheric Research 253(2021).