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| Physicochemical characteristics and long-range transportation of atmospheric particulates during a dust storm episode in Harbin, China |
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Abstract This study investigates the physicochemical characteristics of atmospheric particulates (TSP, PM10 and PM2.5) during a dust storms episode, including the size distribution of the particles and the chemical composition analysis in particles. In addition, long-range transportation of dust particles is estimated by the HYSPLIT trajectory model to investigate the sources of dust. The results show that PM10~100 is the main components during the dust storms episode and PM10~100/TSP is from 50% to 57%. PM2.5/TSP and PM10/TSP reach the lowest value of 0.17 and 0.43. Na, Si, Al, Ca, Fe, K, and Mg in PM10 and TSP have great variation in dust period and are 2~3 times higher than that in non-dust period with the highest concentration of 7.28, 1.98, 19.89, 25.82, 18.77, 4.68, and 6.49 μg/m3in TSP. The mass concentrations of Ca2+, K+, and Mg2+ in the dust period are 2~3 times greater than that in non-dust period with the highest concentration of 22.23, 2.04, and 1.68 μg/m3 in TSP, mainly from soil and dust. The model results show that dust source in dust period is very obvious which starts at the northwest of Inner Mongolia and central regions, going south through Shanxi to the northeast, passing through Hebei, Tianjin, Liaoning, Jilin and other provinces, and continuously inputting into Harbin.
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Received: 30 November 2013
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