Atmospheric OH reactivities in the Pearl River Delta - China in summer   2006: measurement and model results

doi:10.5194/acp-10-11243-2010

CORC > 北京大学 > 环境科学与工程学院

	Atmospheric OH reactivities in the Pearl River Delta - China in summer 2006: measurement and model results
	Lou, S. ; Holland, F. ; Rohrer, F. ; Lu, K. ; Bohn, B. ; Brauers, T. ; Chang, C. C. ; Fuchs, H. ; Haeseler, R. ; Kita, K. ; Kondo, Y. ; Li, X. ; Shao, M. ; Zeng, L. ; Wahner, A. ; Zhang, Y. ; Wang, W. ; Hofzumahaus, A.
刊名	atmospheric chemistry and physics
	2010
关键词	NEW-YORK-CITY VOLATILE ORGANIC-COMPOUNDS LASER-INDUCED PUMP URBAN ATMOSPHERE AIR-POLLUTION METROPOLITAN-AREA OZONE PRODUCTION PROBE TECHNIQUE SOUTHERN CHINA TRACE GASES
DOI	10.5194/acp-10-11243-2010
英文摘要	Total atmospheric OH reactivities (k(OH)) have been measured as reciprocal OH lifetimes by a newly developed instrument at a rural site in the densely populated Pearl River Delta (PRD) in Southern China in summer 2006. The deployed technique, LP-LIF, uses laser flash photolysis (LP) for artificial OH generation and laser-induced fluorescence (LIF) to measure the time-dependent OH decay in samples of ambient air. The reactivities observed at PRD covered a range from 10 s(-1) to 120 s(-1), indicating a large load of chemical reactants. On average, k(OH) exhibited a pronounced diurnal profile with a mean maximum value of 50 s(-1) at daybreak and a mean minimum value of 20 s(-1) at noon. The comparison of reactivities calculated from measured trace gases with measured k(OH) reveals a missing reactivity of about a factor of 2 at day and night. The reactivity explained by measured trace gases was dominated by anthropogenic pollutants (e. g., CO, NOx, light alkenes and aromatic hydrocarbons) at night, while it was strongly influenced by local, biogenic emissions of isoprene during the day. Box model calculations initialized by measured parameters reproduce the observed OH reactivity well and suggest that the missing reactivity is contributed by unmeasured, secondary chemistry products (mainly aldehydes and ketones) that were photochemically formed by hydrocarbon oxidation. Overall, k(OH) was dominated by organic compounds, which had a maximum contribution of 85% in the afternoon. The paper demonstrates the usefulness of direct reactivity measurements, emphasizes the need for direct measurements of oxygenated organic compounds in atmospheric chemistry studies, and discusses uncertainties of the modelling of OVOC reactivities.; Meteorology & Atmospheric Sciences; SCI(E); 54; ARTICLE; 22; 11243-11260; 10
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/396352]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Lou, S.,Holland, F.,Rohrer, F.,et al. Atmospheric OH reactivities in the Pearl River Delta - China in summer 2006: measurement and model results[J]. atmospheric chemistry and physics,2010.
APA	Lou, S..,Holland, F..,Rohrer, F..,Lu, K..,Bohn, B..,...&Hofzumahaus, A..(2010).Atmospheric OH reactivities in the Pearl River Delta - China in summer 2006: measurement and model results.atmospheric chemistry and physics.
MLA	Lou, S.,et al."Atmospheric OH reactivities in the Pearl River Delta - China in summer 2006: measurement and model results".atmospheric chemistry and physics (2010).