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Ionic composition of submicron particles(pm_(1.0)) during the long-lasting haze period in January 2013 in Wuhan, central China

引用

Journal of Environmental Sciences 2014年第4期26卷 810-817页

作者： Hairong Cheng Wei Gong Zuwu Wang Fan Zhang Xinming Wang Xiaopu Lv Jia Liu Xiaoxin Fu Gan Zhang Department of Environmental Engineering School of Resource and Environmental Sciences Wuhan University State Key Laboratory for Information Engineering in Surveying Mapping and Remote Sensing Wuhan University State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences

In January 2013, a long-lasting severe haze episode occurred in Northern and Central China; at its maximum, it covered a land area of approximately 1.4 million km2. In Wuhan, the largest city in Central China, this event was the most severe haze episode in the 21st century. Aerosol samples of submicron particles （pmI.o） were collected during the long-lasting haze episode at an urban site and a suburban site in Wuhan to investigate the ion characteristics of pmi.0 in this area. The mass concentrations of pm1.0 and its water-soluble inorganic ions （WSIIs） were almost at the same levels at two sites, which indicates that pm1.0 pollution occurs on a regional scale in Wuhao. WSIIs （Na^＋, NH4^＋, K^＋, Mg^2＋, Ca^2＋, Cl^-, NO3 and SO2-） were the dominant chemical species and constituted up to 48.4% and 47.4% of pm1.0 at WD and TH, respectively. The concentrations of pm1.0 and WSIIs on haze days were approximately two times higher than on normal days. The ion balance calculations indicate that the particles were more acidic on haze days than on normal days. The results of the back trajectory analysis imply that the high concentrations of pm1.0 and its water-soluble inorganic ions may be caused by stagnant weather conditions in Wuhan.

关键词： pm1.0 water-soluble inorganic ions haze source back trajectory

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