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DOI10.5194/acp-19-11031-2019
Fine particulate matter (PM2.5) trends in China, 2013-2018: separating contributions from anthropogenic emissions and meteorology
Zhai, Shixian1,2; Jacob, Daniel J.2; Wang, Xuan2; Shen, Lu2; Li, Ke2; Zhang, Yuzhong2; Gui, Ke3; Zhao, Tianliang1; Liao, Hong4
发表日期2019
ISSN1680-7316
EISSN1680-7324
卷号19期号:16页码:11031-11041
英文摘要

Fine particulate matter (PM2.5) is a severe air pollution problem in China. Observations of PM2.5 have been available since 2013 from a large network operated by the China National Environmental Monitoring Center (CNEMC). The data show a general 30 %-50 % decrease in annual mean PM2.5 across China over the 2013-2018 period, averaging at -5.2 mu g M-3 a(-1). Trends in the five megacity cluster regions targeted by the government for air quality control are -9.3 +/- 1.8 mu g m(-3) a(-1) (+/- 95 % confidence interval) for Beijing-Tianjin-Hebei, -6.1 +/- 1.1 mu g m(-3) a(-1) for the Yangtze River Delta, -2.7 +/- 0.8 mu g m(-3) a(-1) for the Pearl River Delta, -6.7 +/- 1.3 mu g m(-3) a(-1) for the Sichuan Basin, and -6.5 +/- 2.5 mu g m(-3) a(-1) for the Fenwei Plain (Xi' an). Concurrent 2013-2018 observations of sulfur dioxide (SO2) and carbon monoxide (CO) show that the declines in PM2.5 are qualitatively consistent with drastic controls of emissions from coal combustion. However, there is also a large meteorologically driven interannual variability in PM2.5 that complicates trend attribution. We used a stepwise multiple linear regression (MLR) model to quantify this meteorological contribution to the PM2.5 trends across China. The MLR model correlates the 10 d PM2.5 anomalies to wind speed, precipitation, relative humidity, temperature, and 850 hPa meridional wind velocity (V850). The meteorology-corrected PM2.5 trends after removal of the MLR meteorological contribution can be viewed as being driven by trends in anthropogenic emissions. The mean PM2.5 decrease across China is -4.6 mu g m(-3 )a(-1) in the meteorology-corrected data, 12 % weaker than in the original data, meaning that 12 % of the PM2.5 decrease in the original data is attributable to meteorology. The trends in the meteorology-corrected data for the five megacity clusters are -8.0 +/- 1.1 mu g m(-3) a(-1) for Beijing-Tianjin-Hebei (14 % weaker than in the original data), -6.3 +/- 0.9 mu g m(-3) a(-1) for the Yangtze River Delta (3 % stronger), -2.2 +/- 0.5 mu g m(-3) a(-1) for the Pearl River Delta (19 % weaker), -4.9 +/- 0.9 mu g m(-3) a(-1) for the Sichuan Basin (27 % weaker), and -5.0 +/- 1.9 mu g m(-3) a(-1) for the Fenwei Plain (Xi'an; 23 % weaker); 2015-2017 observations of flattening PM2.5 in the Pearl River Delta and increases in the Fenwei Plain can be attributed to meteorology rather than to relaxation of emission controls.


WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
来源期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/102141
作者单位1.Nanjing Univ Informat Sci & Technol, Collaborat Innovat Ctr Forecast & Evaluat Meteoro, Sch Atmospher Phys, Key Lab Aerosol Cloud Precipitat China Meteorol A, Nanjing 210044, Jiangsu, Peoples R China;
2.Harvard Univ, John A Paulson Sch Engn & Appl Sci, Cambridge, MA 02138 USA;
3.Chinese Acad Meteorol Sci, Key Lab Atmospher Chem, CMA, Beijing 100081, Peoples R China;
4.Nanjing Univ Informat Sci & Technol, Collaborat Innovat Ctr Atmospher Environm & Equip, Sch Environm Sci & Engn, Jiangsu Key Lab Atmospher Environm Monitoring & P, Nanjing 210044, Jiangsu, Peoples R China
推荐引用方式
GB/T 7714
Zhai, Shixian,Jacob, Daniel J.,Wang, Xuan,et al. Fine particulate matter (PM2.5) trends in China, 2013-2018: separating contributions from anthropogenic emissions and meteorology[J],2019,19(16):11031-11041.
APA Zhai, Shixian.,Jacob, Daniel J..,Wang, Xuan.,Shen, Lu.,Li, Ke.,...&Liao, Hong.(2019).Fine particulate matter (PM2.5) trends in China, 2013-2018: separating contributions from anthropogenic emissions and meteorology.ATMOSPHERIC CHEMISTRY AND PHYSICS,19(16),11031-11041.
MLA Zhai, Shixian,et al."Fine particulate matter (PM2.5) trends in China, 2013-2018: separating contributions from anthropogenic emissions and meteorology".ATMOSPHERIC CHEMISTRY AND PHYSICS 19.16(2019):11031-11041.
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