Alkyl nitrates in the boreal forest: formation via the NO<sub>3</sub>-, OH- and O<sub>3</sub>-induced oxidation of biogenic volatile organic compounds and ambient lifetimes
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Published:2019-08-15
Issue:15
Volume:19
Page:10391-10403
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Liebmann Jonathan, Sobanski Nicolas, Schuladen Jan, Karu EinarORCID, Hellén HeidiORCID, Hakola Hannele, Zha QiaozhiORCID, Ehn MikaelORCID, Riva MatthieuORCID, Heikkinen LiineORCID, Williams Jonathan, Fischer Horst, Lelieveld JosORCID, Crowley John N.ORCID
Abstract
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
(ΣANs) in the Finnish boreal forest enabled assessment of the
relative importance of NO3-, O3- 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 O3 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.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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