| 2010年烟台沙漠学术研讨会论文选 |
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| Spatio-temporal Pattern of PM10 Concentration and Impact Factors in the Hinterland and Surrounding Area of Taklimakan Desert |
| LIU Xin-chun1,2, ZHONG Yu-ting1,2, HE Qing1,2, ALI Mamtimin1,2, YANG Xing-hua1,2 |
| 1.Xinjiang Laboratory of Tree Ring Ecology/Key Laboratory of Tree-ring Physical and Chemical Research of China Meteorological Administration, Institute of Desert Meteorology, China Meteorological Administration, Urumqi 830002, China; 2.Taklimakan Desert Atmosphere and Environment Observation Experiment Station, Tazhong 841000, Xinjiang, China |
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Abstract A 6-year observation on dust aerosol with Thermo RP 1400a was conducted in one of the most important dust sources in China, namely, Tazhong, Kumul and Hotan, in the Taklimakan Desert hinterland and its surrounding areas. The basic spatio-temporal distribution characteristics of PM10 mass concentration and the impact factors were analyzed. (1) In Kumul, Tazhong and Hotan, the numbers of dust-floating days and dust-blowing days tended to rise from 2004 through 2009, while the number of the sandstorm days had no apparent variation trend. The frequency and intensity of sand-dust weather were major factors that affected concentration of dust aerosols PM10 in these regions. (2) The PM10 mass concentration presented an evident regional difference, and the value in Kumul was the minimum, and the middle in Hotan, and the value in Tazhong was the maximum. (3) The high value of PM10 mass concentration in Kumul appeared from March to September, that in Hotan and Tazhong was from March to August, which varied in 500~1 000 μg·m-3. (4) The variation of seasonal average PM10 concentration in Kumul, Tazhong and Hotan presented an sequence of spring>summer>autumn>winter; the average PM10 concentration in Tazhong was the maximum, which varied around 1 000 μg·m-3 in spring, 400~900 μg·m-3 in summer and 200~400 μg·m-3 in autumn and winter. (5) The PM10 concentration in sandstorm seasons was generally twice of that in non-sandstorm seasons in Kumul, Tazhong and Hotan. Especially, the PM10 concentration in Tazhong in sandstorm seasons was 6.2 and 3.6 times of that in non-sandstorm season in 2004 and 2008, respectively. (6) When sandstorm weather occurred, the variation of PM10 mass concentration presented an sequence as following: sunshine<floating-dust<blowing-dust<sandstorm. (7) Wind speed impacted PM10 concentration directly, and the bigger wind speed would result in the higher PM10 concentration. In addition, air temperature, relative humidity and air pressure were also important factors causing changes of intensity of dust aerosol and PM10 concentration.
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Received: 30 August 2010
Published: 20 March 2011
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2011, Vol. 31 
