期刊
ATMOSPHERIC AND OCEANIC SCIENCE LETTERS
卷 9, 期 1, 页码 15-21出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/16742834.2015.1131948
关键词
Tianjin; water-soluble ions; fireworks; organic carbon; elemental carbon
资金
- Beijing Natural Science Foundation [8142034]
- Chinese Academy of Sciences [XDB0502050, XDB05030203]
To better understand the characteristics of air quality and the relationship between the chemical composition evolution and source variation, an intensive atmospheric campaign was conducted in Tianjin, a megacity of the North China Plain, from 10 February to 6 March 2015. There were 20 days exceeding the threshold value of secondary Chinese Ambient Air Quality Standards for PM 2.5 (75 mu g m(-3), daily average over 24 h) during the study period. Five air pollution episodes were selected for investigation. During the pre-holiday pollution episode, NH4+, NO3-, and SO42- were more abundant, indicating that air pollution was caused by motor vehicle exhaust emissions and coal consumption under unfavorable meteorological conditions. During Chinese Lunar New Year's Eve, widespread use of fireworks resulted in extremely high aerosol concentrations. Firework displays caused increases in K+ and also enrichment of SO42- relative to NO3- The holiday pollution episode was caused by regional transport, characterized by abundant SO42- and NH4+. In addition, the aging processes of the particles from fireworks discharge played an important role in the formation of NO3 and SO42-. The Lantern Festival episode was characterized by a transition from the enrichment of K+ to secondary inorganic ions (NO3-, SO42-, and NH4+). The results of this study are useful for a detailed understanding of the variation in atmospheric compositions and sources caused by anthropogenic activity, and highlight the importance of controlling intensive fireworks discharge.
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