Low temperatures enhance organic nitrate formation: evidence from observations in the 2012 Uintah Basin Winter Ozone Study
Low temperatures enhance organic nitrate formation: evidence from observations in the 2012 Uintah Basin Winter Ozone Study
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DOI：
10.5194/acp-14-12441-2014
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发表时间：
2014-11
影响因子：
6.3
通讯作者：
L. Lee;P. Wooldridge;J. Gilman;C. Warneke;J. Gouw;R. Cohen
中科院分区：
文献类型：
--
作者：
L. Lee;P. Wooldridge;J. Gilman;C. Warneke;J. Gouw;R. Cohen
抽象。在2012年美国犹他州的尤因塔盆地冬季臭氧研究（UBWOS）中，使用热解离激光诱导荧光测量了二氧化氮（NO2）和总硝酸烷基酯（CNOAN）。观察到的NO2浓度是最高的日出前和下午晚些时候最低，暗示一个持久的本地源NO2加上湍流混合的边界层。相比之下，CO2 AN与中午最大值的太阳辐射共同变化，表明当地的光化学生产与快速混合和/或沉积相结合，是决定CO2 AN浓度的主导因素。我们计算出的HOx自由基链终止的一个大部分（~60%），并表明，温度依赖性的硝酸烷基酯的产量提高的作用，在当地的化学在冬季相比，会发生什么在温暖的温度下的夏天的CONANS。
Abstract. Nitrogen dioxide (NO2) and total alkyl nitrates (ΣANs) were measured using thermal dissociation laser-induced fluorescence during the 2012 Uintah Basin Winter Ozone Study (UBWOS) in Utah, USA. The observed NO2 concentration was highest before sunrise and lowest in the late afternoon, suggestive of a persistent local source of NO2 coupled with turbulent mixing out of the boundary layer. In contrast, ΣANs co-varied with solar radiation with a noontime maximum, indicating that local photochemical production combined with rapid mixing and/or deposition was the dominant factor in determining the ΣAN concentrations. We calculate that ΣANs were a large fraction (~60%) of the HOx free radical chain termination and show that the temperature dependence of the alkyl nitrate yields enhances the role of ΣANs in local chemistry during winter by comparison to what would occur in the warmer temperatures of summer.