气候变化领域集成服务门户(CCPortal): Wintertime Particulate Matter Decrease Buffered by Unfavorable Chemical Processes Despite Emissions Reductions in China

CCPortal

DOI	10.1029/2020GL087721
	Wintertime Particulate Matter Decrease Buffered by Unfavorable Chemical Processes Despite Emissions Reductions in China
	Leung D.M.; Shi H.; Zhao B.; Wang J.; Ding E.M.; Gu Y.; Zheng H.; Chen G.; Liou K.-N.; Wang S.; Fast J.D.; Zheng G.; Jiang J.; Li X.; Jiang J.H.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:14
英文摘要	Extreme and persistent haze events frequently occur during wintertime China. While recent emissions reductions reduced annual mean fine particulate matter (PM2.5) concentrations over eastern China, their effectiveness on wintertime PM2.5 trend remains uncertain. We use observations and model simulations to quantify seasonal differences in PM2.5 trends and investigate the underlying chemical mechanisms driving such differences. We find a much slower decrease in observed wintertime PM2.5 (−3.2% yr−1) since 2014, in contrast to a drastic summertime decrease (−10.3% yr−1). Simulations show two previously underappreciated mechanisms buffering wintertime PM2.5 decrease, including an increase in oxidation capacity due to nitrogen oxides (NOx) reductions under wintertime volatile organic compound (VOC)-limited chemistry, and an enhanced conversion of nitric acid to nitrate by ammonia due to sulfur dioxide reductions. Our findings suggest that control policies targeting VOC and deep NOx reductions are needed to improve wintertime PM2.5 air quality over China. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Air quality; Ammonia; Nitrogen oxides; Particles (particulate matter); Sulfur dioxide; Volatile organic compounds; Chemical mechanism; Chemical process; Emissions reduction; Fine particulate matter (PM2.5); Oxidation capacity; Particulate Matter; Seasonal differences; Volatile organic compound (VOC); Particulate emissions; air quality; concentration (composition); emission control; extreme event; haze; particulate matter; seasonal variation; winter; China
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170106
作者单位	Department of Atmospheric and Oceanic Sciences and Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, Los Angeles, CA, United States; Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; Pacific Northwest National Laboratory, Richland, WA, United States; Department of Hydraulic Engineering, Tsinghua University, Beijing, China; Saratoga High School, Saratoga, CA, United States; School of Environment, and State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing, China; Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
推荐引用方式 GB/T 7714	Leung D.M.,Shi H.,Zhao B.,et al. Wintertime Particulate Matter Decrease Buffered by Unfavorable Chemical Processes Despite Emissions Reductions in China[J],2020,47(14).
APA	Leung D.M..,Shi H..,Zhao B..,Wang J..,Ding E.M..,...&Jiang J.H..(2020).Wintertime Particulate Matter Decrease Buffered by Unfavorable Chemical Processes Despite Emissions Reductions in China.Geophysical Research Letters,47(14).
MLA	Leung D.M.,et al."Wintertime Particulate Matter Decrease Buffered by Unfavorable Chemical Processes Despite Emissions Reductions in China".Geophysical Research Letters 47.14(2020).