Abstract:126 groups of size-segregated aerosol samples collected from Guangzhou, Shenzhen, Haikou and some other regions in South China during 1998~2010 were utilized to characterize the temporal-spatial variations of size-resolved mass concentrations of AEC and inorganic water-soluble ions. Notable regional differences were displayed, the mass concentrations of Na+ and Cl- at different sites presented the characteristics of island > coastal > rural > urban. To the contrary, mass concentrations of other major ions and AEC were in the order of urban > rural > coastal > island sites. During different observation periods, size-resolved mass concentrations of AEC showed a similar bimodal pattern for all sites, with the prominent peak located in the range of 0.43~0.65μm and the smaller peak distributed in a larger size range (4.7~5.8μm). The vertical distributions of AEC and inorganic water-soluble ions can be categorized into three types according to the corresponding size-resolved mass concentrations. Specifically, the secondary ions (SO42-, NO3- and NH4+) showed a distinct three-peak pattern, double-peak structures were found in the results of F-, Ca2+, Mg2+, Na+ and Cl-, both K+ and AEC displayed a significant single peak in the fine-particle mode. The mass concentrations of AEC and inorganic water-soluble ions varied with the variation of height. Precipitations played a crucial role in the removal of aerosol particles larger than 1μm, especially on the size bins of 1.1~2.1μm. In local aerosol pollution episodes, the size-resolved mass concentration of AEC had a pronounced unimodal pattern within the submicron size ranges.
廖碧婷, 吴兑, 陈静, 李菲, 谭浩波, 邓涛. 华南地区大气气溶胶中EC和水溶性离子粒径分布特征[J]. 中国环境科学, 2015, 35(5): 1297-1309.
LIAO Bi-Ting, WU Dui, CHEN Jing, LI Fei, TAN Hao-Bo, DENG Tao. Size-resolved mass concentrations of elemental carbon and inorganic water-soluble ions in South China. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(5): 1297-1309.