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| A preliminary study of the growth characteristics of ambient fine particles in Shijiazhuang |
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Abstract To better understand the microphysical characteristics of the ambient fine particles in Shijiazhuang, the atmospheric particles, nitrogen oxides (NOx) and sulphur dioxide (SO2) were measured at an observation station in Shijiazhuang meteorological bureau during May, 2010. The results showed that the ambient fine particle pollution was serious, especially the particle size in the range of 0.01~0.1μm, which accounting for about 89.3% of the total fine particles. The results of the diurnal variations of aerosol number concentrations suggested that the fine particles with the range of 0.01~0.02 μm and 0.02~0.1 μm had a similar diurnal cycle, however, the diurnal variation pattern of the particles ranged from 0.1 μm to 1.0 μm was quite different from them. According to the case study of the particle growth, the number concentrations of the particles with the range of 0.01~0.02μm increased rapidly at 08:00 in the morning, and then quickly reached its maximum value. Because of the continued growth of their diameter, the number concentrations of them decreased quickly. The size growth of these fine particles resulted in the fast increase of larger particles (0.02~0.04μm) before 12:00. In addition, the meteorological parameters and pollution gases was analyzed. The results indicated that the gaseous phase nucleation of SO2 was the most possible mechanism of the particle growth under the conditions of low relative humidity, small changes of wind speed/direction and the rising solar radiation.
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Received: 24 January 2011
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