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. The formation of alkyl nitrates in various oxidation processestaking place throughout the diel cycle can represent an important sink ofreactive nitrogen and mechanism for chain termination in atmosphericphoto-oxidation cycles. The low-volatility alkyl nitrates (ANs) formed frombiogenic volatile organic compounds (BVOCs), especially terpenoids, enhancerates of production and growth of secondary organic aerosol. Measurements ofthe NO3 reactivity and the mixing ratio of total alkyl nitrates( Σ ANs) in the Finnish boreal forest enabled assessment of therelative importance of NO3 -, O3 - and OH-initiated formation ofalkyl nitrates from BVOCs in this environment. The high reactivity of theforest air towards NO3 resulted in reactions of the nitrate radical,with terpenes contributing substantially to formation of ANs not only duringthe night but also during daytime. Overall, night-time reactions of NO3 accounted for 49 % of the local production rate of ANs, with contributionsof 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 theorder of 2 h due to efficient uptake to aerosol (and dry deposition),resulting in the transfer of reactive nitrogen from anthropogenic sources tothe forest ecosystem.

atmospheric chemistry and physics

Alkyl nitrates in the boreal forest: formation via the NO&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt;-, OH- and O&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt;-induced oxidation of biogenic volatile organic compounds and ambient lifetimes