| 天气与气候 |
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| Impact of Dust Events on Air PM10 Concentration in the Lanzhou Valley |
| JIA Xiao-peng1, CHEN Kai-feng2 |
| 1.Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2.Gansu Province Electric Power Investment Group Corporation, Lanzhou 730030, China |
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Abstract Seasonal variation of PM10 and the causes of the PM10 long-term trend in Lanzhou valley were studied using the air pollutant monitoring data during 1999—2001 in Lanzhou and the statistical data of dust storm frequency in Hexi Corridor. Results indicated that the dust storm events in Hexi Corridor area had an important influence on PM10 concentration of Lanzhou, and the PM10 concentration showed higher value in Spring and Winter while exhibited lower value in Summer. Sand-dust frequency monitoring data during 1985—2001 demonstrated that the annual average frequentcy of dust events in the sixteen years in middle-east part of the Hexi Corridor was about 37.6 days, and the annual average days of the dust events in the sixteen years in the Lanzhou Valley was about 24.4 days, and there was a significant correlation between them (R=0.67, P=0.003). Statistical analysis of hourly mean PM10 concentration in 2001 in the Lanzhou Valley showed that PM10 peak values more than 1.0 mg·m-3 were mostly caused by the process of dust storm in Hexi Corridor area, however, PM10 peak values between 0.5—1.0 mg·m-3 were mainly caused by the emission of industrial pollutant SO2, NOx and some other particles. In order to effectively improve the air quality in Lanzhou for ever, it is advisable to not only establish effective control strategies of emission but also improve surrounding ecological environment.
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Received: 18 August 2010
Published: 20 November 2011
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2011, Vol. 31 
