Wenxuan Fan1, Jian Wu This email address is being protected from spambots. You need JavaScript enabled to view it.1, Xiaopeng Li2, Fangyuan Yang2, Bing Chen1

1 Key Laboratory of Atmospheric Environment and Processes in the Boundary Layer over the Low-Latitude Plateau Region, Department of Atmospheric Science, Yunnan University, Kunming 650500, China
2 Meteorological Observatory of Kunming, Kunming 650118, China


Received: March 30, 2020
Revised: June 16, 2020
Accepted: August 26, 2020

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.4209/aaqr.2020.03.0125  

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Cite this article:

Fan, W., Wu, J., Li, X., Yang, F. and Chen, B. (2020). Influences of a Quasi-stationary Front on Particulate Matter in the Low-latitude Plateau Region in China. Aerosol Air Qual. Res. https://doi.org/10.4209/aaqr.2020.03.0125


HIGHLIGHTS

  • The location and intensity of KMQSF influenced the distribution of PM.
  • The weak even disappeared KMQSF favored the generation of pollution events.
  • The pollution could be transported to Yunnan from Guizhou by easterly during KMQSF.
 

ABSTRACT


A comprehensive assessment of the main pollution characteristics of particulate matter (PM) in the low-latitude plateau (LoLaP) region in China by utilizing observation and reanalysis data and statistical methods is presented to reveal influences of the Kunming quasi-stationary front (KMQSF) on PM concentration in LoLaP in winter. It is found that the location and intensity of the KMQSF significantly influenced the distribution pattern of PM and induced high concentrations in some areas in LoLaP region in a typical pollution event in 2016. Furthermore, all the KMQSF synoptic weathers over LoLaP region from 2014-2019 were investigated and classified into 9 Patterns, which led to different air pollution patterns in LoLaP region. When the KMQSF moved westward from middle LoLaP, the PM could be transported to west part of LoLaP by the easterly wind, which led to the daily mean PM10 and PM2.5 concentrations increase in Kunming, a central city in the west part of LoLaP, at the same time, high concentrations of PM10 and PM2.5 maintained in Guiyang, a central city locating in the east part of LoLaP. When the KMQSF gradually retreated from west part of LoLaP to east part, the PM in Kunming decreased with a strengthening of the westerly, and the PM in Guiyang further increased with a decrease of the planetary boundary layer (PBL) height and boundary layer dissipation (BLD). When the KMQSF disappeared, the formation of calm inversion pollution could be caused, including a shallow PBL and weak BLD in whole LoLaP, which induced the highest daily mean PM10 and PM2.5 concentrations both in the two central cities in all patterns.


Keywords: Particulate matter; The Kunming quasi-stationary front; The planetary boundary layer; Atmospheric stability; The low-latitude plateau region.



Aerosol Air Qual. Res. 20 :-. https://doi.org/10.4209/aaqr.2020.03.0125  


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