中国科学院重庆绿色智能技术研究院机构知识库

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	Chemical composition of precipitation and its spatiotemporal variations in the Three Gorges Reservoir Region
	Lu, Qunmin1; Zhao, Liang2; Li, Li3; Yang, Fumo4,5,6; Yang, Qingling3; Wei, Shiqiang1; Ouyang, Wenjuan4; He, Kebin7; Chen, Gangcai3,6
	2013
摘要	In order to understand the main chemical constituents within precipitations and their spatiotemporal variations in the Three Gorges Reservoir Region, the atmospheric precipitation samples were collected from three stations along the reservoir during 2000 to 2009. pH, conductivity, and ions were analyzed. Average pH values were 5.76, 6.03, and 5.52, and average conductivity were 117.3, 72.3, and 63.1 μS·cm-1 in Banan, Fuling and Wanzhou, respectively. The rainwater in these districts exhibited a significant acidification trend over the past decade with more serious pollution levels than those in Beijing, Chengdu, Shenzhen, and Hunan. The concentration of SO42- accounted for 77% of total anions, while NH4+ and Ca2+ were the major cations. The relatively low mass ratio of NO3- to SO42- in the three stations indicated that the type of rain acidity was still dominantly from sulfuric acid. The ionic constituents of precipitation presented clear spatial-temporal variations, due to seasonal variations in emissions and meteorology, including the rainfall intensity. The ion concentrations were higher in winter and spring and lower in summer and autumn. Precipitation pollution in the three stations exhibited a clearly decreasing trend with distance from downtown Chongqing.
发表期刊	Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae
ISSN	02532468
卷号	33期号:6页码:1682-1689
语种	中文