Observational Study of Aerosol Extinction Property during Dust Weather in Background Area
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Abstract:
Using the continuous data of PM2.5 mass concentration, aerosol absorbing and scattering coefficients collected during March and May 2006 at the Shangdianzi background station, a primary study of the optical properties of aerosol in sanddust weather is conducted. The results indicate: (1) In the selected clear days, the value of PM2.5 mass concentration and daily average absorbing and scattering coefficients were about 10 μg/m3, 7 Mm-1, 20 Mm-1, respectively. The value of singlescattering albedo ranged from 0.71 to 0.78. During the transportation of pollutants from urban area to the background station, the average PM2.5 mass concentration, absorbing and scattering coefficients were 145 μg/m3,445 Mm-1, and 374.3 Mm-1. The value of single scattering albedo ranged from 0.84 to 0.94.While in sanddust weather, the value of PM2.5 mass concentration, aerosol absorbing and scattering coefficients, single scattering albedo ranged from 248.2 μg/m3to 424.1 μg/m3, 10.8 Mm-1 to 44.7 Mm-1, 225.4 Mm-1 to 393.9 Mm-1, and 0.89 to 0.96, respectively. (2) Affected by the sanddust weather, the increasing ranges of aerosol mass concentration and scattering coefficients were much greater than that of absorbing coefficient. (3) Through comparing the results from the three kinds of weather, it is found that the sanddust weather made the concentration of particles increase up to an abnormally high value and fluctuate greatly in a short time. The absorbing coefficient of aerosol in sanddust weather was much higher than in clear days but lower than during the pollutant transporting process from urban area to background station. The scattering coefficient of aerosol in sanddust weather was much higher than in clear days, close to that during the pollution case. The sanddust weather contributed to the scattering effect more greatly than to the absorbing effect of aerosol.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.