Research on Ground-Level PM2.5 Mass Concentration Retrieval Based on MODIS Aerosol Optical Thickness

  • XIA Zhiye ,
  • LIU Zhihong ,
  • WANG Yongqian ,
  • CHEN Hongbin ,
  • SUN Mingjiang ,
  • JIAO Lu
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  • Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, China

Received date: 2014-01-09

  Online published: 2015-12-28

Abstract

Urban haze is becoming more and more serious in these years, especially in the Yangtze River Delta region, the Pearl River Delta region, the Area of Beijing ferry look forward to and other cities, the PM2.5 particles are the main component. In order to mainly retrieve mass concentration about PM2.5 near the surface using MODIS AOT(aerosol optical thickness) data. Firstly, the comparison analyses between AOT from MODIS and corresponding PM2.5 mass concentration in situ are done, the direct linear correlation coefficient R=0.323. And then R=0.467 improved on the base of elevation correction for AOT and relative humidity correction for PM2.5 primarily. Secondly, the seasonal variations about AOT and PM2.5 in depth are analyzed, find that the correlation is highest in autumn, 0.802, and lowest in spring, 0.252, and other seasons are between them, and analyzing the effect mechanism from AOT and PM2.5 themselves' physical and chemical features and meteorological factors to the both correlativity. In the end, a logarithm reversion model about PM2.5 mass concentration coupled with the elevation and relative humidity correction is constructed, the RMSE is 2.84% and mean error is 9.53% respectively, compared to ground measured data. Studies show that this logarithm reversion model can retrieve PM2.5 mass concentration near the ground effectively using AOT, and provide a new scientific basis for PM2.5 reversion by remote sensing, and also valuable for haze detection.

Cite this article

XIA Zhiye , LIU Zhihong , WANG Yongqian , CHEN Hongbin , SUN Mingjiang , JIAO Lu . Research on Ground-Level PM2.5 Mass Concentration Retrieval Based on MODIS Aerosol Optical Thickness[J]. Plateau Meteorology, 2015 , 34(6) : 1765 -1771 . DOI: 10.7522/j.issn.1000-0534.2014.00075

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