Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 5.668 IF 5.668
  • IF 5-year value: 6.201 IF 5-year
    6.201
  • CiteScore value: 6.13 CiteScore
    6.13
  • SNIP value: 1.633 SNIP 1.633
  • IPP value: 5.91 IPP 5.91
  • SJR value: 2.938 SJR 2.938
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 174 Scimago H
    index 174
  • h5-index value: 87 h5-index 87
Discussion papers
https://doi.org/10.5194/acp-2020-198
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-198
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 12 Mar 2020

Submitted as: research article | 12 Mar 2020

Review status
This preprint is currently under review for the journal ACP.

Effects of atmospheric circulations on the interannual variation in PM2.5 concentrations over the Beijing-Tianjin-Hebei region in 2013–2018

Xiaoyan Wang1,2 and Renhe Zhang1,2 Xiaoyan Wang and Renhe Zhang
  • 1Department of Atmospheric and Oceanic Sciences & Institute of Atmospheric Sciences, Fudan University, Shanghai, China
  • 2Big Data Institute for Carbon Emission and Environmental Pollution,Fudan University, Shanghai, China

Abstract. The Chinese government has made many efforts to mitigate fine particulate matter (PM2.5) pollution in recent years by taking strict measures on air pollutants reduction, which has generated the nationwide improvements in air quality since 2013. However, under the stringent air pollution controls, how PM2.5 concentration varies and how much the meteorological conditions contribute to the interannual variations in PM2.5 concentrations are still unclear, which is very important for the local government to assess the emission reduction of previous year and adjust mitigation strategies of next year. The effects of atmospheric circulation on the interannual variation in wintertime PM2.5 concentrations over the Beijing-Tianjin-Hebei (BTH) region in the period of 2013–2018 are evaluated in this study. Generally, the transport of clean and dry air masses and unstable boundary layer working with the effective near-surface horizontal divergence or pumping action at the top of the boundary layer benefit for the horizontal or vertical diffusion of surface air pollutants. Instead, the co-occurrence of a stable boundary layer, frequent air stagnation, positive water vapor advection and deep near-surface horizontal convergence exacerbate the air pollution. Favorable circulation conditions lasting for 2~4 days are beneficial for the diffusion of air pollutants, and 3~7 days of unfavorable circulation events exacerbate the accumulation of air pollutants. The occurrence frequency of favorable circulation events is consistent with the interannual variation in seasonal mean PM2.5 concentrations. There is better diffusion ability in the winters of 2014 and 2017 than in other years. A 76.5 % of the observed decrease in PM2.5 concentrations in 2017 over the BTH region could be attributed to the improvement in atmospheric diffusion conditions. It is essential to exclude the contribution of meteorological conditions to the variation in interannual air pollutants when making a quantitative evaluation of emission reduction measurements.

Xiaoyan Wang and Renhe Zhang

Interactive discussion

Status: open (until 07 May 2020)
Status: open (until 07 May 2020)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement

Xiaoyan Wang and Renhe Zhang

Xiaoyan Wang and Renhe Zhang

Viewed

Total article views: 224 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
163 57 4 224 11 2 4
  • HTML: 163
  • PDF: 57
  • XML: 4
  • Total: 224
  • Supplement: 11
  • BibTeX: 2
  • EndNote: 4
Views and downloads (calculated since 12 Mar 2020)
Cumulative views and downloads (calculated since 12 Mar 2020)

Viewed (geographical distribution)

Total article views: 208 (including HTML, PDF, and XML) Thereof 206 with geography defined and 2 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 01 Apr 2020
Publications Copernicus
Download
Short summary
This study investigated the meteorological element effects on the interannual variation in air quality. It shows consistent variations of PM2.5 concentrations and occurrence of unfavorable circulation types. The favorable meteorological condition in 2017 contributes to 76.5 % of the interannual decrease in PM2.5 concentrations, which highlights the importance of atmospheric conditions when evaluate the interannual variations in local air quality.
This study investigated the meteorological element effects on the interannual variation in air...
Citation