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首页> 外文期刊>Atmospheric chemistry and physics >Organic nitrate aerosol formation via NOsub3/sub + biogenic volatile organic compounds in the southeastern United States
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Organic nitrate aerosol formation via NOsub3/sub + biogenic volatile organic compounds in the southeastern United States

机译：美国东南部通过NO 3 +生物挥发性有机化合物形成有机硝酸盐气溶胶

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Gas- and aerosol-phase measurements of oxidants, biogenic volatile organiccompounds (BVOCs) and organic nitrates made during the Southern Oxidant and Aerosol Study (SOAS campaign, Summer 2013) in central Alabama showthat anitrate radical (NO3) reaction with monoterpenes leads to significantsecondary aerosol formation. Cumulative losses of NO3 to terpenes arecorrelated with increase in gas- and aerosol-organic nitrate concentrationsmade during the campaign. Correlation of NO3 radical consumption toorganic nitrate aerosol formation as measured by aerosol mass spectrometry and thermal dissociation laser-induced fluorescence suggests a molar yieldof aerosol-phase monoterpene nitrates of 23–44 %. Compounds observed viachemical ionization mass spectrometry (CIMS) are correlated to predictednitrate loss to BVOCs and show C10H17NO5, likely a hydroperoxynitrate, is a major nitrate-oxidized terpene product being incorporated intoaerosols. The comparable isoprene product C5H9NO5 was observed tocontribute less than 1 % of the total organic nitrate in the aerosol phaseand correlations show that it is principally a gas-phase product from nitrateoxidation of isoprene. Organic nitrates comprise between 30 and 45 % of theNOy budget during SOAS. Inorganic nitrates were also monitored andshowed that during incidents of increased coarse-mode mineral dust,HNO3 uptake produced nitrate aerosol mass loading at a rate comparable to thatof organic nitrate produced via NO3 + BVOCs.
机译：在阿拉巴马州中部进行的南部氧化剂和气溶胶研究（SOAS活动，2013年夏季）期间对气相气态和气态气态的氧化剂，生物挥发性有机化合物（BVOCs）和有机硝酸盐进行了测量，结果表明，花药的自由基（NO 3 ）与单萜的反应会导致大量二次气溶胶形成。萜烯中NO 3 的累积损失与运动中产生的气体和气溶胶有机硝酸盐浓度增加相关。气溶胶质谱法和热解离激光诱导的荧光测量的NO 3 自由基消耗与有机硝酸盐气溶胶形成的相关性表明，气溶胶相单萜硝酸盐的摩尔产率为23–44％。通过化学电离质谱（CIMS）观察到的化合物与预测的BVOC硝酸盐损失相关，并显示C 10 H 17 NO 5 ，可能是氢过氧硝酸盐，是掺入气溶胶的主要硝酸盐氧化萜烯产品。观察到可比的异戊二烯产物C 5 H 9 NO 5 在气溶胶相中贡献的有机硝酸盐总量不到1％，相关性表明它主要是异戊二烯硝酸盐氧化的气相产物。在SOAS中，有机硝酸盐占NO y 预算的30％至45％。还对无机硝酸盐进行了监测，结果表明，在粗模式矿物粉尘增加的事件中，HNO 3 的吸收产生的硝酸盐气溶胶质量负荷的速率与通过NO 3 + BVOC。

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