Critical role of meteorological conditions in a persistent haze episode in the Guanzhong basin, China

The Science of the Total Environment
Naifang BeiTian Feng

Abstract

In the present study, the critical role of the meteorological condition in a persistent extreme haze episode that occurred in Guanzhong basin of China on December 16 to 25, 2013 has been investigated. Analyses of the large-scale meteorological conditions on 850hPa during the episode have been performed using the NCEP FNL data set, indicating that synoptic situations generally facilitate the accumulation of pollutants either in horizontal or vertical directions in the basin. The FLEXPART model has been utilized to illustrate the pollutant transport patterns during the episode, further showing the dominant role of synoptic conditions in accumulation of pollutants in the basin. Detailed meteorological conditions, such as temperature inversion, and low-level horizontal wind speed also contribute to the extreme haze episode. In addition, the WRF-CHEM model has been used to evaluate the responses of the surface PM2.5 level to the emission mitigation. Generally, the predicted PM2.5 spatial patterns and temporal variations agree well with the observations at the ambient monitoring sites. Sensitivity studies show that the emissions in the basin need to be mitigated by more than 91% to meet the excellent level of the China National Air Q...Continue Reading

References

Aug 31, 2011·Journal of the Air & Waste Management Association·Lina GaoPeng Yan
Apr 16, 2014·Proceedings of the National Academy of Sciences of the United States of America·Yuan WangMario J Molina
Nov 26, 2014·Proceedings of the National Academy of Sciences of the United States of America·Song GuoRenyi Zhang

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Citations

Nov 12, 2016·The Science of the Total Environment·Hongbo Fu, Jianmin Chen
Nov 28, 2019·Environmental Science and Pollution Research International·Lifeng GuoYanhu Zhang
Dec 17, 2020·Proceedings of the National Academy of Sciences of the United States of America·Meng XingZhisheng An
Jul 30, 2020·The Science of the Total Environment·Tian FengXuexi Tie
Apr 21, 2021·Faraday Discussions·John G WatsonJudith C Chow

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