Online monitoring of water-soluble ionic composition of PM10 during early summer over Lanzhou City |
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Authors: | Jin Fan Xiaoying Yue Yi Jing Qiang Chen and Shigong Wang |
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Institution: | College of Atmospheric Science, Lanzhou University, Lanzhou 730000, China;College of Geography and Environment, Northwest Normal University, Lanzhou 730070, China;College of Atmospheric Science, Lanzhou University, Lanzhou 730000, China;College of Atmospheric Science, Lanzhou University, Lanzhou 730000, China;College of Atmospheric Science, Lanzhou University, Lanzhou 730000, China |
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Abstract: | Lanzhou is one of the most aerosol-polluted cities in China. In this study, an online analyzer for Monitoring for AeRosols and GAses was deployed to measure major water-soluble inorganic ions in PM10 at 1-hour time resolution, and 923 samples were obtained from Apr 1 to May 24, 2011. During the field campaign, air pollution days were encountered with Air Quality Index more than 100 and daily average concentration of PM10 exceeding 150 μg/m3. Based on the variation of water-soluble ions and results of Positive Matrix Factorization 3.0 model execution, the air pollution days were classified as crustal species- or secondary aerosol-induced, and the different formation mechanisms of these two air pollution types were studied. During the crustal species pollution days, the content of Ca2+ increased and was about 2.3 times higher than the average on clear days, and the air parcel back trajectory was used to analyze the sources of crustal species. Data on sulfate, trace gases and meteorological factors were used to reveal the formation mechanism of secondary aerosol pollution. The sulfur oxidation ratio (SOR) was derived from the 923 samples, and the SOR had high positive correlation with relative humidity in early summer in Lanzhou. |
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Keywords: | particulate matter MARGA air pollution index Lanzhou |
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