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Surface Aerosol Optical Properties during High and Low Pollution Periods of an Urban Site in Central China

Category: Urban Air Quality

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DOI: 10.4209/aaqr.2017.12.0565

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Boming Liu1, Wei Gong1,2, Yingying Ma 1,2, Ming Zhang1, Jian Yang3, Miao Zhang4,5

  • 1 State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing (LIESMARS), Wuhan University, Wuhan 430079, China
  • 2 Collaborative Innovation Center for Geospatial Technology, Wuhan 430079, China
  • 3 Department of Information Engineering, China University of Geosciences, Wuhan 430074, China
  • 4 School of Environmental Science and Tourism, Nanyang Normal University, Nanyang 473061, China
  • 5 Henan Province Key Laboratory of Remote Sensing Monitoring of Natural Disasters, Nanyang 473061, China


Aerosol optical properties are analyzed on different pollution days over Wuhan.
The σap shows well positive correlation with PM2.5 concentrations in clean periods.
The σsp and PM2.5 concentrations had good positive correlation at pollution days.


Aerosol scattering (σsp) and absorption (σap) coefficients and single scattering albedo (SSA) were continuously measured and analyzed for an urban site in Wuhan of central China from November 2014 to July 2017. The average σsp (532 nm), σap (532 nm), and SSA in Wuhan during the study period were 244 ± 212 Mm-1, 27 ± 17 Mm-1, and 0.86 ± 0.09, respectively. The aerosol optical properties had pronounced and distinctive diurnal cycles in the Wuhan area. The σsp and σap exhibited the highest values from 06:00 to 08:00 local time (LT) and the lowest values between 14:00 and 16:00 LT, which was mainly due to the coupling with increasing traffic emissions. PM2.5 was a major contributor to the large optical parameters. During pollution periods, the mean σsp (624 Mm-1) was roughly 3 times that for clean periods (214 Mm-1), and the 58 Mm-1 of σap was about 2.5 times that of the 24 Mm-1 during clean periods. The wind speed and direction also strongly affected the aerosol optical properties during the different periods. The high σsp and σap values for the pollution periods were accompanied by calm winds (0 to 2 m s-1), from 0° to 45°, whereas the low σsp and σap values of the clean periods were observed with high wind speed (more than 4 m s-1), from 0° to 90°. Moreover, the σap showed a clear positive correlation (R2 = 0.412) with the PM2.5 concentrations for the clean periods, whereas the σsp had a good positive correlation (R2 = 0.406) with the PM2.5 concentrations during the pollution periods.


Aerosol scattering coefficients Aerosol absorption coefficients Single scattering albedo Haze pollution PM2.5

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