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Chinese Geographical Science

, Volume 29, Issue 6, pp 917–933 | Cite as

Spatiotemporal Variations and Regional Transport of Air Pollutants in Two Urban Agglomerations in Northeast China Plain

  • Xiaolan Li
  • Xiaoming Hu
  • Shuaiyi Shi
  • Lidu Shen
  • Lan Luan
  • Yanjun MaEmail author
Article
  • 5 Downloads

Abstract

Characteristics of air pollution in Northeast China (NEC) received less research attention in the past comparing to other heavily polluted regions in China. Spatiotemporal variations of six criteria air pollutants (PM10, PM2.5, SO2, NO2, O3 and CO) in Central Liaoning Urban Agglomeration (CLUA) and Harbin-Changchun Urban Agglomeration (HCUA) in NEC Plain were analyzed in this study based on three-year hourly observations of air pollutants and meteorological variables from 2015 to 2017. The results indicated that the annual mean concentrations of air pollutants are generally higher in the middle and southern regions in NEC Plain and lower in the northern region. Megacities such as Shenyang, Harbin and Changchun experience severe air pollution, with a three-year averaged air quality index (AQI) larger than 80, far exceeding the daily AQI standard at the first-level of 50 in China. The annual mean PM and SO2 concentrations decrease most significantly in NEC urban agglomerations from 2015 to 2017, followed by CO and NO2, while O3 shows a slight increasing trend. All the six pollutants exhibit obvious seasonal and diurnal variations, and these variations are dictated by local emission and meteorological conditions. PM2.5 and O3 concentrations in NEC urban agglomerations strongly depend on wind conditions. High O3 concentrations at different cities usually occur in presence of strong winds but are independent on wind direction (WD), while high PM2.5 is usually accompanied by weak winds and poor dispersion condition, and sometimes also occur when the northerly or southerly winds are strong. Regional transport of air pollutants between NEC urban agglomerations is common. A severe haze event on November 1–4, 2017 is examined to demonstrate the role of regional transport on pollution.

Keywords

criteria air pollutant meteorological condition regional transport urban agglomeration of Northeast China 

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Copyright information

© Science Press, Northeast Institute of Geography and Agroecology, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Xiaolan Li
    • 1
  • Xiaoming Hu
    • 2
    • 3
  • Shuaiyi Shi
    • 4
    • 5
  • Lidu Shen
    • 6
  • Lan Luan
    • 7
  • Yanjun Ma
    • 1
    Email author
  1. 1.Institute of Atmospheric EnvironmentChina Meteorological AdministrationShenyangChina
  2. 2.Center for Analysis and Prediction of StormsUniversity of OklahomaNormanUSA
  3. 3.School of MeteorologyUniversity of OklahomaNormanUSA
  4. 4.State Key Laboratory of Remote Sensing Science, Aerospace Information Research InstituteChinese Academy of SciencesBeijingChina
  5. 5.College of Resources and EnvironmentUniversity of Chinese Academy of SciencesBeijingChina
  6. 6.Shenyang Regional Climatic CenterShenyangChina
  7. 7.Chinese Academy of Meteorological SciencesBeijingChina

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