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| Characteristics of Dust Events and Their Influence on Air Quality of Lanzhou, China |
| Guo Yongtao1, Xin Jinyuan2, Li Xu1, Wang Shigong1, Li Jiangping1 |
1. College of Atmospheric Sciences/Key Laboratory of Semi-arid Climate Changes, Ministry of Education, Lanzhou University, Lanzhou 730000, China;
2. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China |
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Abstract Based on the dust events data from Gansu Meteorological Bureau from 1951 to 2005 and air pollutant data including PM10, SO2 and NO2 concentrations from Lanzhou Environmental Monitoring Station, the temporal distribution characteristics of dust events and the impacts of dust events on SO2, NO2 and PM10 concentrations were analyzed. The dust storm, blowing dust and floating dust generally descended from 1951 to 2000 in Lanzhou, and their change tendency rate were on average -0.15, -0.72, -0.97 days per year, respectively. The impacts of dust events on SO2 and NO2 concentrations were little, and were obvious on both PM2.5 and PM1.0 concentrations, but were serious on PM10 concentration, the contribute of dust events on PM10 concentration in spring were between 18.4% and 43.1%. During a severe dust event process on May 10, 2007, PM10 concentration sharply increased with dust intrusion, then, it reached relatively high level, afterwards gradually dropped and recovered to the normal concentration level because of dust weakening, fading or leaving. PM2.5 and PM1.0 concentrations also somewhat increased during dust event, the characteristics of their variations were similar to PM10 concentration.
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Received: 19 May 2014
Published: 20 July 2015
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2015, Vol. 35 
