Alkyl nitrates in the boreal forest : formation via the NO3-, OH- and O-3-induced oxidation of biogenic volatile organic compounds and ambient lifetimes

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Liebmann , J , Sobanski , N , Schuladen , J , Karu , E , Hellen , H , Hakola , H , Zha , Q , Ehn , M , Riva , M , Heikkinen , L , Williams , J , Fischer , H , Lelieyeld , J & Crowley , J N 2019 , ' Alkyl nitrates in the boreal forest : formation via the NO3-, OH- and O-3-induced oxidation of biogenic volatile organic compounds and ambient lifetimes ' , Atmospheric Chemistry and Physics , vol. 19 , no. 15 , pp. 10391-10403 . https://doi.org/10.5194/acp-19-10391-2019

Title: Alkyl nitrates in the boreal forest : formation via the NO3-, OH- and O-3-induced oxidation of biogenic volatile organic compounds and ambient lifetimes
Author: Liebmann, Jonathan; Sobanski, Nicolas; Schuladen, Jan; Karu, Einar; Hellen, Heidi; Hakola, Hannele; Zha, Qiaozhi; Ehn, Mikael; Riva, Matthieu; Heikkinen, Liine; Williams, Jonathan; Fischer, Horst; Lelieyeld, Jos; Crowley, John N.
Contributor: University of Helsinki, INAR Physics
University of Helsinki, INAR Physics
University of Helsinki, INAR Physics
University of Helsinki, Doctoral Programme in Atmospheric Sciences
Date: 2019-08-15
Language: eng
Number of pages: 13
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7316
URI: http://hdl.handle.net/10138/310875
Abstract: The formation of alkyl nitrates in various oxidation processes taking place throughout the diel cycle can represent an important sink of reactive nitrogen and mechanism for chain termination in atmospheric photo-oxidation cycles. The low-volatility alkyl nitrates (ANs) formed from biogenic volatile organic compounds (BVOCs), especially terpenoids, enhance rates of production and growth of secondary organic aerosol. Measurements of the NO3 reactivity and the mixing ratio of total alkyl nitrates (6 ANs) in the Finnish boreal forest enabled assessment of the relative importance of NO3-, O-3- and OH-initiated formation of alkyl nitrates from BVOCs in this environment. The high reactivity of the forest air towards NO3 resulted in reactions of the nitrate radical, with terpenes contributing substantially to formation of ANs not only during the night but also during daytime. Overall, night-time reactions of NO3 accounted for 49% of the local production rate of ANs, with contributions of 21 %, 18% and 12% for NO3, OH and O-3 during the day. The lifetimes of the gas-phase ANs formed in this environment were on the order of 2 h due to efficient uptake to aerosol (and dry deposition), resulting in the transfer of reactive nitrogen from anthropogenic sources to the forest ecosystem.
Subject: NITROGEN-OXIDES
MOUNTAIN-SITE
ALPHA-PINENE
AEROSOL
REACTIVITY
CHEMISTRY
RADICALS
GAS
SPECTROMETER
DEGRADATION
114 Physical sciences
116 Chemical sciences
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