Abstract
With a continuous liquefaction sampling device for atmospheric fine particles, we built an online system for real-time monitoring of atmospheric water-soluble inorganic ions and meteorological factors. The association rules between water-soluble inorganic ions and meteorological factors in atmospheric fine particles (PM2.5) sampled hourly between April and May 2010 in Lanzhou, China were mined out using Apriori algorithm. Also the real-time effects of meteorological factors on the mass concentrations of water-soluble inorganic ions were investigated. This paper examines seven most recent patents between October 2008 and June 2014 in the area of Business Intelligence and Atmospheric Sciences. The results show that sulfates were dominant in the composition of atmospheric water-soluble inorganic ions. The major meteorological factor affecting the mass concentrations of water-soluble inorganic ions was the joint action of temperature and relatively humidity. The ion concentrations were higher during daytime than at night, and increased at high-temperature and low-relatively humidity conditions, indicating that the photochemical effect significantly promoted the generation of water-soluble inorganic ions. The NW wind would carry the ions from the industrial zone in West Lanzhou to the downtown, since the atmospheric transport elevated the concentrations of water-soluble inorganic ions. When strong wind passed, ρ(Ca2+) increased from inward transport, but the mass concentrations of other water-soluble inorganic ions decreased. The concentrations of all ions decreased at high-relatively humidity and raining conditions.
Keywords: Water-soluble inorganic ions, PM2.5, Lanzhou, sources.
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