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Temporal variations of atmospheric carbonyls in urban ambient air and street canyons of a Mountainous city in Southwest China
X Pang; X Lee
2010
Source PublicationAtmospheric Environment
Volume44Issue:17Pages:2098-2106
AbstractCarbonyl compounds in urban ambient air and street canyons were measured from December 2008 to August 2009 in a mountainous city in southwest China (Guiyang). The formaldehyde yield from the photo-oxidation of isoprene emitted by vegetation was estimated to be in the range of 0.63–3.6202μg02m 613 from May to August, which accounted for 28.8–33.4% of ambient formaldehyde. Based on the calculation of photolysis rates and rates of reaction with the OH radical, it was found that photolysis was the predominant sink for formaldehyde and acetone in both summer and winter. For acetaldehyde, photo-oxidation by OH radicals and photolysis were the major sinks in summer while photo-oxidation by OH radicals was the dominant sink in winter. Wet precipitation was found to be an important removal process for the atmospheric carbonyls. In the urban ambient air, the average concentrations of formaldehyde, acetaldehyde, acetone and all carbonyls were 4.802±022.1, 5.702±023.3, 5.102±022.5, and 25.102±029.202μg02m 613 ( n 02=02139), respectively. The average concentrations of these species in street canyons were 18.802±026.5, 9.402±023.2, 10.902±022.1, and 64.102±0216.302μg02m 613 ( n 02=0262), respectively. The significantly higher carbonyl levels on weekdays (compared to weekends) highlight the contribution of vehicle emissions to carbonyls in the street canyons.
Subject Area环境地球化学
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/352002/6825
Collection环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
Recommended Citation
GB/T 7714
X Pang,X Lee. Temporal variations of atmospheric carbonyls in urban ambient air and street canyons of a Mountainous city in Southwest China[J]. Atmospheric Environment,2010,44(17):2098-2106.
APA X Pang,&X Lee.(2010).Temporal variations of atmospheric carbonyls in urban ambient air and street canyons of a Mountainous city in Southwest China.Atmospheric Environment,44(17),2098-2106.
MLA X Pang,et al."Temporal variations of atmospheric carbonyls in urban ambient air and street canyons of a Mountainous city in Southwest China".Atmospheric Environment 44.17(2010):2098-2106.
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