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| 论文编号: |
108 |
| 论文题目: |
Seasonal behavior of carbonyls and source characterization of formaldehyde (HCHO) in ambient air |
| 英文论文题目: |
Seasonal behavior of carbonyls and source characterization of formaldehyde (HCHO) in ambient air |
| 第一作者: |
Lui, KH |
| 英文第一作者: |
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| 联系作者: |
Ho, K. F |
| 英文联系作者: |
Ho, K. F |
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| 发表年度: |
2017 |
| 卷: |
152 |
| 期: |
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| 页码: |
51-60 |
| 摘要: |
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| 英文摘要: |
Gas-phase formaldehyde (HCHO) is an intermediate and a sensitive indicator for volatile organic compounds (VOCs) oxidation, which drives tropospheric ozone production. Effective photochemical pollution control strategies demand a thorough understanding of photochemical oxidation precursors, making differentiation between sources of primary and secondary generated HCHO inevitable. Spatial and seasonal variations of airborne carbonyls based on two years of measurements (2012-2013), coupled with a correlation-based HCHO source apportionment analysis, were determined for three sampling locations in Hong Kong (denoted HT, TC, and YL). Formaldehyde and acetaldehyde were the two most abundant compounds of the total quantified carbonyls. Pearson's correlation analysis (r > 0.7) implies that formaldehyde and acetaldehyde possibly share similar sources. The total carbonyl concentration trends (HT < TC < YL) reflect location characteristics (urban > rural). A regression analysis further quantifies the relative primary HCHO source contributions at HT (similar to 13%), TC (similar to 21%), and YL (similar to 40%), showing more direct vehicular emissions in urban than rural areas. Relative secondary source contributions at YL (similar to 36%) and TC (similar to 31%) resemble each other, implying similar urban source contributions. Relative background source contributions at TC could be due to a closed structure microenvironment that favors the trapping of HCHO. Comparable seasonal differences are observed at all stations. The results of this study will aid in the development of a new regional ozone (O-3) control policy, as ambient HCHO can enhance O-3 production and also be produced from atmospheric VOCs oxidation (secondary HCHO). |
| 刊物名称: |
ATMOSPHERIC ENVIRONMENT |
| 英文刊物名称: |
ATMOSPHERIC ENVIRONMENT |
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| 全文链接: |
http://www.sciencedirect.com/science/article/pii/S1352231016309633 |
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