Influence of regional pollution and sandstorms on the chemical composition of cloud/fog at the summit of Mt. Taishan in northern China |
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| Authors: | Yan Wang Jia Guo Tao Wang Aijun Ding Jian Gao Yang Zhou Jeffrey L. Collett Wenxing Wang |
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| Affiliation: | 1. School of Environmental Science and Engineering, Shandong University, Jinan, China, 250100;2. Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hong Kong, China;3. School of Atmospheric Sciences, Nanjing University, Nanjing, China, 210093;4. Chinese Research Academy of Environmental Sciences, Beijing, China, 100000;5. Environment Research Institute, Shandong University, Jinan, China, 250100;6. Atmospheric Science Department, Colorado State University, Ft. Collins, CO, USA, 80523 |
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| Abstract: | Cloud/fog samples were collected during spring of 2007 in the highly polluted North China Plain in order to examine the impact of pollution and dust particles on cloud water chemistry. The volume weighted mean pH of cloud water was 3.68. The cloud acidity was shown to be associated with air mass origins. Cloud water with its air mass trajectories originating from the southern part of China was more acidic than those from northern China. Anthropogenic source and dust had obvious impact on cloud water composition as indicated by the very high mean concentrations of SO42? (1331.65 μeq L? 1), NO3? (772.44 μeq L? 1), NH4+ (1375.92 μeq L? 1) and Ca2+ (625.81 μeq L? 1) in the observation periods. During sandstorm days, cloud pH values were relatively high, and the concentrations of all the ions in cloud water reached unusual high levels. Significant decreases in the mass concentrations of PM2.5 and PM10 were observed during cloud events. The average scavenging ratio for PM2.5 and PM10 was 52.0% and 55.7%, respectively. Among the soluble ions in fine particles, NO3?, K+ and NH4+ tend to be more easily scavenged than Ca2+ and Na+. |
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