Key Lab. of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China.
Key Lab. of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.
Sci Total Environ. 2018 Feb 1;613-614:131-139. doi: 10.1016/j.scitotenv.2017.08.302. Epub 2017 Sep 12.
Dinitrogen pentoxide (NO) is one of the basic trace gases which plays a key role in nighttime atmosphere. An intercomparison and validation of different NO measurement methods is important for determining the true accuracy of these methods. Cavity ring down spectroscopy (CRDS) and cavity enhanced absorption spectrometer (CEAS) were used to measure NO at the campus of the University of Chinese Academy of Sciences (UCAS) from February 21, 2016 to March 4, 2016. The detection limits were 1.6ppt (1σ) at 30s intervals for the CEAS instrument and 3.9ppt (1σ) at 10s time resolution for the CRDS instrument respectively. In this study, a comparison of the 1min observations from the two instruments was presented. The two data sets showed a good agreement within their uncertainties, with an absolute shift of 15.6ppt, slope of 0.94 and a correlation coefficient R=0.97. In general, the difference between the CRDS and CEAS instruments for NO measurement can be explained by their combined measurement uncertainties. However, high relative humidity (>60%) and high PM2.5 concentration (>200μg/m) may contribute to the discrepancies. The excellent agreement between the measurement by the CRDS and CEAS instruments demonstrates the capability of the two instruments for accurately measuring NO with high sensitivity.
五氧化二氮（NO）是一种基本的痕量气体，在夜间大气中起着关键作用。不同 NO 测量方法的相互比较和验证对于确定这些方法的真实准确性非常重要。腔衰荡光谱（CRDS）和腔增强吸收光谱（CEAS）于 2016 年 2 月 21 日至 3 月 4 日在中国科学院大学校园（UCAS）进行了 NO 测量。CEAS 仪器的检测限为 1.6ppt（1σ），在 30s 间隔下；CRDS 仪器的检测限为 3.9ppt（1σ），在 10s 时间分辨率下。在这项研究中，对两台仪器的 1min 观测结果进行了比较。两组数据在不确定度范围内具有很好的一致性，绝对偏移为 15.6ppt，斜率为 0.94，相关系数 R=0.97。一般来说，CRDS 和 CEAS 仪器对 NO 测量的差异可以用它们的综合测量不确定度来解释。然而，高相对湿度（>60%）和高 PM2.5 浓度（>200μg/m）可能导致了差异。CRDS 和 CEAS 仪器测量结果之间的良好一致性证明了这两种仪器具有高灵敏度、准确测量 NO 的能力。
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