Comparison of laser-induced fluorescence and chemiluminescence measurements of NO2 at an urban site
Comparison of laser-induced fluorescence and chemiluminescence measurements of NO2 at an urban site
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DOI：
10.1016/j.atmosenv.2011.07.065
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发表时间：
2011-11
影响因子：
5
通讯作者：
H. Suzuki;Y. Miyao;T. Nakayama;J. Pearce;Y. Matsumi;Kenshi Takahashi;K. Kita;K. Tonokura
中科院分区：
文献类型：
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作者：
H. Suzuki;Y. Miyao;T. Nakayama;J. Pearce;Y. Matsumi;Kenshi Takahashi;K. Kita;K. Tonokura
2007-2009年夏季，在日本东京（35°71′N，139°76′E）的一个城市站点进行了二氧化氮（NO2）浓度的现场测量。采用化学发光法和激光诱导荧光法同时测定环境中NO2浓度。由LIF和Mo-CL技术确定的NO2浓度之间的紧密的线性相关性是显而易见的，除了高臭氧浓度超过50 ppbv的时期。在高臭氧事件中，Mo-CL和LIF技术之间的NO2浓度的相关图表明Mo-CL NO2的高估。为了详细研究两种技术之间的系统差异，在2009年夏天采用了热解离激光诱导荧光（TD-LIF）仪器来测量总过氧硝酸盐（HNOPNs）和总活性氮（NOz）。我们发现，NO2浓度的差异，确定的Mo-CL和LIF技术的NO2浓度的相关性很好。这一结果表明，过氧硝酸盐物种显着贡献的高O3浓度下，在我们的观察在东京的城市站点的Mo-CL测量所观察到的干扰。
In situ measurements of nitrogen dioxide (NO2) concentrations were conducted at an urban site in Tokyo (35°71′N, 139°76′E), Japan during the summers of 2007–2009. A chemiluminescence instrument equipped with a molybdenum oxide converter (Mo-CL) and a laser-induced fluorescence (LIF) instrument were used simultaneously for determining the ambient NO2concentrations. A tight linear correlation between the NO2concentrations determined by the LIF and Mo-CL techniques was evident except for high ozone concentration periods over 50 ppbv. During the high ozone episodes, correlation plots of the NO2concentrations between Mo-CL and LIF techniques indicated an overestimation of Mo-CL NO2. To examine in detail the systematic differences between two techniques, a thermal dissociation laser-induced fluorescence (TD-LIF) instrument was employed in the summer of 2009 to measure total peroxy nitrates (ΣPNs) and total reactive nitrogen (NOz). We found that the ΣPNs concentrations correlated well with the discrepancies in NO2concentrations determined by the Mo-CL and LIF techniques. This result suggests that peroxy nitrate species significantly contribute to the observed interference in the Mo-CL measurements under high O3concentrations in our observation at the urban site in Tokyo.