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| Observation study on mass concentration of dust aerosols in the Taklimakan Desert Hinterland |
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Abstract An over 6 years dust aerosol investigation had been carried out in Tazhong area of Taklimakan Desert hinterland, which is one of the most important dust sources in China. The fundamental characteristics of dust aerosol’s concentration were summarized as below: the floating and blowing dust appeared an increasing tendency in day time, meanwhile, the sandstorm appeared a decreasing tendency. The frequency and intensity dust weather were major factors which were significantly affected the concentration of dust aerosols in the desert region. The monthly peak values of PM10 concentration distributed in spring and summer: the largest peak value range was between March to May and the second peak value range occurred between July to August. Average concentration of PM10 varied around 1000mg/m3 in spring and changed between 400 to 900mg/m3 in summer. Lower concentrations appeared in autumn and winter with about 200~400mg/m3. The TSP concentration was higher between March and September. The largest peak value range of TSP concentration was between April to May and the second peak value range occurred between July to August. The lowest TSP concentration took place in 2005 with the annual average of 1105.0mg/m3. The TSP concentration value was slightly higher in 2009 than in 2008 with annual average of 1878.0mg/m3. And the monthly average concentration of TSP in May was the highest with the value of 7415.0mg/m3. The mass concentration increased with the following sequences in the sandstorm weather: sunshine, floating dust, blowing dust and sandstorm. Wind speed had the influential role to mass concentration, and the higher speed of wind was, the higher mass concentration was. The temperature and air humility were also the driving forces of sandstorm intensity, which were indirectly influence the mass concentration variation as well.
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Received: 06 January 2011
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