Semi-continuous measurement of water-soluble ions in PM_2.5 in Jinan, China: Temporal variations and source apportionments

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• 作者：Xiaomei Gao^a ; Lingxiao Yang^a ; ^b ; ^{yanglingxiao@sdu.edu.cn} ; Shuhui Cheng^a ; Rui Gao^a ; Yang Zhou^a ; Likun Xue^a ; Youping Shou^a ; Jing Wang^a ; Xinfeng Wang^a ; Wei Nie^a ; Pengju Xu^a ; Wenxing Wang^a ; ^c
• 关键词：semi-continuous ; Water-soluble ions ; PM2.5 ; Seasonal and diurnal variations ; Transport patterns ; Sources ; Jinan
• 刊名：Atmospheric Environment
• 出版年：2011
• 出版时间：October, 2011
• 年：2011
• 卷：45
• 期：33
• 页码：6048-6056
• 全文大小：1K

文摘

To better understand secondary aerosol pollution and potential source regions, semi-continuous measurement of water-soluble ions in PM_2.5 was performed from December 2007 to October 2008 in Jinan, the capital of Shandong Province. The data was analyzed with the aid of backward trajectory cluster analysis in conjunction with redistributed concentration field (RCF) model and principal component analysis (PCA). , and were the most abundant ionic species with annual mean concentrations (¡Àstandard deviations) of 38.33 (¡À26.20), 15.77 (¡À12.06) and 21.26 (¡À16.28)?¦Ìg?m^?, respectively, which are among the highest levels reported in the literatures in the world. Well-defined seasonal and diurnal patterns of , and were observed. The fine sulfate and nitrate oxidation ratios (SOR and NOR) were much higher in summer (SOR: 0.47?¡À?0.13; NOR: 0.28?¡À?0.03) than those in other seasons (SOR: 0.17-0.30; NOR: 0.12-0.14), indicating more extensive formations of and in summer. The most frequent air masses connected with high concentrations of , and originated from Shandong Province in spring, autumn and winter, while from the Yellow Sea in summer, and then slowly traveled in Shandong Province to Jinan. RCF model indicated that Shandong Province was the main potential source region for and and other potential source regions were also identified including the provinces of Hebei, Henan, Anhui and Jiangsu and the Yellow Sea. Principal component analysis indicated that the major sources contributing to PM_2.5 pollution were secondary aerosols, coal/biomass burnings and traffic emissions.