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Diurnal and seasonal variations of nitrogen contents and isotopic composition of total nitrogen in PM2.5 in Tianjin |
DONG Zhi-chao, XU Zhan-jie, WANG Shuang, LI Pei-sen, ZHAO Xue-yan, FU Ping-qing, LIU Cong-qiang, Chandra Mouli Pavuluri |
Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China |
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Abstract In order to understand the sources of nitrogen in atmospheric aerosols in Tianjin, the concentration of inorganic ions and nitrogen isotopic composition (δ15N) of total nitrogen (TN) in fine aerosols (PM2.5) collected on day and night basis in summer and winter of 2016 were studied. The results showed that the average mass concentration of PM2.5 in winter (207μg/m3) was much higher than that in summer (40.1μg/m3), and the δ15N value of TN in PM2.5in winter (+5.1‰) was lower than that in summer (+10.7‰), with high enrichment of 15N in the summer. The average concentration of NH4+ in PM2.5 in summer was higher than that of NO3- (c(NO3-)), whereas in winter, it was opposite:c(NO3-) was higher than c(NH4+), followed by c(SO42-). In addition, both nitrogen contents and δ15N of TN in PM2.5 showed significant differences between day and night in summer, but not in winter. The results demonstrated that the nitrogen loading in summer aerosols in Tianjin was significantly affected by the sea-land circulation, that is, with ocean aerosols during the day and terrestrial aerosols at night. However, East Asian monsoon in winter weakened the exchange effect of sea-land circulation, while the contribution of fossil fuel combustion source to nitrogen was more significant in winter.
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Received: 03 August 2020
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