气候变化领域集成服务门户(CCPortal): Investigation of the α-pinene photooxidation by OH in the atmospheric simulation chamber SAPHIR

CCPortal

DOI	10.5194/acp-19-11635-2019
	Investigation of the α-pinene photooxidation by OH in the atmospheric simulation chamber SAPHIR
	Rolletter M.; Kaminski M.; Acir I.-H.; Bohn B.; Dorn H.-P.; Li X.; Lutz A.; Nehr S.; Rohrer F.; Tillmann R.; Wegener R.; Hofzumahaus A.; Kiendler-Scharr A.; Wahner A.; Fuchs H.
发表日期	2019
ISSN	16807316
起始页码	11635
结束页码	11649
卷号	19 期号:18
英文摘要	The photooxidation of the most abundant monoterpene, α-pinene, by the hydroxyl radical (OH) was investigated at atmospheric concentrations in the atmospheric simulation chamber SAPHIR. Concentrations of nitric oxide (NO) were below 120 pptv. Yields of organic oxidation products are determined from measured time series giving values of 0:11±0:05, 0:19±0:06, and 0:05±0:03 for formaldehyde, acetone, and pinonaldehyde, respectively. The pinonaldehyde yield is at the low side of yields measured in previous laboratory studies, ranging from 0.06 to 0.87. These studies were mostly performed at reactant concentrations much higher than observed in the atmosphere. Time series of measured radical and trace-gas concentrations are compared to results from model calculations applying the Master Chemical Mechanism (MCM) 3.3.1. The model predicts pinonaldehyde mixing ratios that are at least a factor of 4 higher than measured values. At the same time, modeled hydroxyl and hydroperoxy (HO2) radical concentrations are approximately 25% lower than measured values. Vereecken et al. (2007) suggested a shift of the initial organic peroxy radical (RO2) distribution towards RO2 species that do not yield pinonaldehyde but produce other organic products. Implementing these modifications reduces the model-measurement gap of pinonaldehyde by 20% and also improves the agreement in modeled and measured radical concentrations by 10 %. However, the chemical oxidation mechanism needs further adjustment to explain observed radical and pinonaldehyde concentrations. This could be achieved by adjusting the initial RO2 distribution, but could also be done by implementing alternative reaction channels of RO2 species that currently lead to the formation of pinonaldehyde in the model. © 2019 Author(s).
语种	英语
scopus关键词	computer simulation; concentration (composition); hydroxyl radical; monoterpene; photooxidation; reaction kinetics; time series analysis; trace gas
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144150
作者单位	Institute of Energy and Climate Research, IEK-8: Troposphere, Forschungszentrum Jülich GmbH, Jülich, Germany; Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden; Federal Office of Consumer Protection and Food Safety, Department 5: Method Standardisation, Resistance to Antibiotics, Berlin, Germany; Institute of Nutrition and Food Sciences, Food Chemistry, University of Bonn, Bonn, Germany; State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, China; European University of Applied Sciences, Brühl, Germany
推荐引用方式 GB/T 7714	Rolletter M.,Kaminski M.,Acir I.-H.,et al. Investigation of the α-pinene photooxidation by OH in the atmospheric simulation chamber SAPHIR[J],2019,19(18).
APA	Rolletter M..,Kaminski M..,Acir I.-H..,Bohn B..,Dorn H.-P..,...&Fuchs H..(2019).Investigation of the α-pinene photooxidation by OH in the atmospheric simulation chamber SAPHIR.Atmospheric Chemistry and Physics,19(18).
MLA	Rolletter M.,et al."Investigation of the α-pinene photooxidation by OH in the atmospheric simulation chamber SAPHIR".Atmospheric Chemistry and Physics 19.18(2019).