Alkyl nitrates in the boreal forest: formation via the NO3-, OH- and O3-induced oxidation of biogenic volatile organic compounds and ambient lifetimes
Alkyl nitrates in the boreal forest: formation via the NO3-, OH- and O3-induced oxidation of biogenic volatile organic compounds and ambient lifetimes
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DOI：
10.5194/acp-19-10391-2019
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发表时间：
2019-08
影响因子：
6.3
通讯作者：
J. Liebmann;N. Sobanski;J. Schuladen;Einar Karu;H. Hellén;H. Hakola;Q. Zha;M. Ehn;M. Riva;L. Heikkinen;Jonathan Williams;H. Fischer;J. Lelieveld;J. Crowley
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文献类型：
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作者：
J. Liebmann;N. Sobanski;J. Schuladen;Einar Karu;H. Hellén;H. Hakola;Q. Zha;M. Ehn;M. Riva;L. Heikkinen;Jonathan Williams;H. Fischer;J. Lelieveld;J. Crowley
抽象的。硝酸烷基酯在整个昼夜循环中发生的各种氧化过程中的形成可以代表活性氮的重要汇和大气光氧化循环中链终止的机制。由生物挥发性有机化合物（BVOCs），特别是萜类化合物形成的低挥发性硝酸烷基酯（AN）提高了二次有机气溶胶的产生和生长速率。测量的NO3的反应性和混合比的总烷基硝酸盐（CNOANs）在芬兰北方森林使评估的相对重要性NO3-，O3-和OH-引发的形成烷基硝酸盐在这种环境中的BVOCs。森林空气对NO3的高反应性导致了硝酸根的反应，萜烯不仅在夜间而且在白天对AN的形成有很大的贡献。总的来说，夜间反应的NO3占49%的本地生产率的AN，与贡献的NO3，OH和O3在白天的21%，18%和12%。在这种环境中形成的气相AN的寿命为2小时的顺序，由于有效的吸收气溶胶（和干沉积），导致在转移的活性氮从人为来源的森林生态系统。
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.