globalchange  > 气候变化与战略
DOI: 10.1016/j.scitotenv.2020.136892
Title:
Evaluating the contributions of changed meteorological conditions and emission to substantial reductions of PM2.5 concentration from winter 2016 to 2017 in Central and Eastern China
Author: Zhang W.; Wang H.; Zhang X.; Peng Y.; Zhong J.; Wang Y.; Zhao Y.
Source Publication: Science of the Total Environment
ISSN: 489697
Publishing Year: 2020
Volume: 716
Language: 英语
Keyword: Central and Eastern China ; Emission ; GRAPES-CUACE model ; Meteorological conditions ; PM2.5 concentration
Scopus Keyword: Air quality ; Atmospheric chemistry ; Chemical analysis ; Emission control ; Neutron emission ; Topography ; Comparative analysis ; Eastern China ; Geographical locations ; Meteorological condition ; PM2.5 concentration ; Regional assimilation ; Relative contribution ; Substantial reduction ; Meteorology ; air quality ; concentration (composition) ; emission inventory ; particulate matter ; topography ; winter ; air quality ; article ; China ; city ; grape ; meteorology ; nonhuman ; prediction ; topography ; winter ; Beijing [China] ; China ; Vitaceae
English Abstract: The monthly average PM2.5 concentration decreased from 127.15 μg m− 3 in December 2016 to 85.54 μg m− 3 in December 2017 (approximately 33%) in Central and Eastern China (33°N–41°N, 113°E–118°E). This decrease is attributed to the combined impacts of meteorology and emission sources changes, though the question of which is more important has raised great concerns. Four sensitivity experiments based on the Global-Regional Assimilation and Prediction System coupled with the Chinese Unified Atmospheric Chemistry Environment (GRAPES-CUACE) model, together with comparative analysis of the observed meteorological conditions and emission inventory between 2016 and 2017, are used to evaluate the relative contributions of meteorology and emission to the substantial reductions of PM2.5 concentration from December 2016 to December 2017. The results show that the meteorological conditions and emission in December 2017 were both beneficial to the PM2.5 decrease in Central and Eastern China. Regarding the entire region, 21.9% of the PM2.5 decrease was a result of the favorable meteorological conditions, and 78.1% of the decrease was a result of emission reductions, showing the distinct contributions of emission reductions on the air quality. The relative contributions of meteorology varied from 12.2% to 50.9% to the PM2.5 decrease from December 2016 to December 2017, while the emission contributed 49.1% to 87.8%, in different cities depending on geographical location and topography. Meteorology showed the largest contributions to the PM2.5 decrease from 2016 to 2017 in Beijing (BJ), which caused the greatest total decrease of PM2.5 compared to that of other cities. In addition, in Central and Eastern China, the dominant factors of the decrease of PM2.5 were favorable meteorological conditions (accounting for 98.2%) during clear periods and emission reductions (accounting for 72.5–81.2%) during pollution periods. © 2020 Elsevier B.V.
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Document Type: 期刊论文
Identifier: http://119.78.100.158/handle/2HF3EXSE/158230
Appears in Collections:气候变化与战略

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Affiliation: State Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing, China; Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing, 210044, China; Center for Excellence in Regional Atmospheric Environment, IUE, Chinese Academy of Sciences, Xiamen, China

Recommended Citation:
Zhang W.,Wang H.,Zhang X.,et al. Evaluating the contributions of changed meteorological conditions and emission to substantial reductions of PM2.5 concentration from winter 2016 to 2017 in Central and Eastern China[J]. Science of the Total Environment,2020-01-01,716
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