Contribution of meteorological factors to particulate pollution during winters in Beijing

Meng, Can1,2; Cheng, Tianhai1,2; Gu, Xingfa1,2; Shi, Shuaiyi1,2; Wang, Wannan1,2; Wu, Yu1,2; Bao, Fangwen3

2019-03-15

10.1016/j.scitotenv.2018.11.365

SCIENCE OF THE TOTAL ENVIRONMENT   影响因子和分区

0048-9697

1879-1026

Associated with its modernization, Beijing has experienced significant fine particulate matter (PM2.5) pollution, especially in winter. In 2016, severe PM2.5 pollution (PM2.5 > 250 mu g/m(3)) lasted over 6 days and affected over 23 million people. A major challenge in dealing with this issue is the uncertainty regarding the influence of individual meteorological factors to the overall PM2.5 concentration in Beijing. Thus, applying an empirical regression method to long-term ground-based PM2.5 data and meteorological sounding measurements, we attempted to analyze the influence of individual meteorological factors on PM2.5 pollution during winters in Beijing. We found that horizontal dilution and vertical aggregation plays a major role in PM2.5 pollution during the winter of 2016. The impact of horizontal wind on PM2.5 concentration in Beijing was mainly from its dilution, the dilution of northerly wind contributed 27.8% in 2016, far below its contribution in 2015 (32.2%). The contribution from the growing vertical aggregation observed in 2016 was mainly the result of both the lower height of the planetary boundary layer and the greater depth of the temperature inversion. The dilution of the planetary boundary layer height contributed 9.8% to PM2.5 pollution in 2016, 5.4% lower than that in 2017. Compared with the temperature difference of the inversion layer, the temperature inversion depth better reflects the aggregated impact of temperature inversions to PM2.5, which was 10.9% in 2015, and the ratio rose to 14.3% in 2016. Relative humidity is also an important impacting factor, which contributed 41.0%, far higher than the ratio in 2017 (26.7%). Such results imply that we should focus on not only local emission control, but also horizontal atmospheric transport and meteorological conditions in order to provide a more accurate analysis of pollution mechanisms, conductive to air pollution governance in Beijing. (C) 2018 Elsevier B.V. All rights reserved.

Air pollution in Asia Horizontal wind Planetary boundary layer height Temperature inversion Relative humidity

SCI ; EI

英语

其他

Environmental Sciences & Ecology

Environmental Sciences

WOS:000455039600095

ELSEVIER

20184906215722

Air pollution ; Atmospheric humidity ; Atmospheric temperature ; Atmospheric thermodynamics ; Boundary layer flow ; Boundary layers ; Climatology ; Dilution ; Emission control ; Regression analysis

Meteorology:443 ; Atmospheric Properties:443.1 ; Air Pollution:451 ; Air Pollution Control:451.2 ; Fluid Flow, General:631.1 ; Mathematical Statistics:922.2

ENVIRONMENT/ECOLOGY

Web of Science

1.Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Key Lab Remote Sensing Sci, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen, Peoples R China

Meng, Can,Cheng, Tianhai,Gu, Xingfa,et al. Contribution of meteorological factors to particulate pollution during winters in Beijing[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019,656:977-985.

Meng, Can.,Cheng, Tianhai.,Gu, Xingfa.,Shi, Shuaiyi.,Wang, Wannan.,...&Bao, Fangwen.(2019).Contribution of meteorological factors to particulate pollution during winters in Beijing.SCIENCE OF THE TOTAL ENVIRONMENT,656,977-985.

Meng, Can,et al."Contribution of meteorological factors to particulate pollution during winters in Beijing".SCIENCE OF THE TOTAL ENVIRONMENT 656(2019):977-985.