Inter-comparison of two high-accuracy fast-response spectroscopic sensors of carbon dioxide: a case study
Inter-comparison of two high-accuracy fast-response spectroscopic sensors of carbon dioxide: a case study
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两种高精度快速响应二氧化碳光谱传感器的相互比较：案例研究
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发表时间：
2012
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通讯作者：
N. McDowell
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作者：
B. Flowers;H. Powers;M. Dubey;N. McDowell
抽象的。 2010 年夏季和秋季，在洛斯阿拉莫斯国家实验室的现场和实验室条件下共同部署了用于大气二氧化碳的可调谐二极管激光吸收 (TDL) 和腔衰荡光谱 (CRDS) 传感器。两种传感器都针对地面环境二氧化碳测量的准确度和精密度进行了表征，并使用实验室和环境现场数据进行了比较。经过包括水汽校正和 WMO 参考标准校准在内的后处理后，2010 年 7 月 29 日至 8 月 16 日期间观察到总体平均值 [ 12 C 16 O 2 ] = 392.05 ± 8.92 ppm 和 [ 12 C 16 O 2 ] = 392.22 ± 9.05 ppm。 12 CO 2 的 CRDS 和 TDL 数据之间的平均差为环境现场数据为 0.04 ± 1.80 ppm（60 秒内 ±1σ），证明传感器符合 WMO/IAEA 兼容性标准。观察结果显示，在 19 天的时间内，[CO 2 ] CRDS '/[CO 2 ] TDL 比率呈现出以 x 0 = 1.003 ± 3.38 × 10 -5 (±1σ) 为中心的高斯分布，表明该比率由随机噪声主导，而不是任一传感器输出中的偏差。 CRDS 传感器能够在 1 分钟内测量 [ 12 C 16 O 2 ]，精度达到 23 ppb，并在 58 分钟内降低到 6.5 ppb。在 1 分钟和 58 分钟时，TDL 的精度分别为 29 ppb 和 53 ppb。 CRDS结构紧凑、快速、稳定； TDL 较大，需要频繁校准才能保持其精度。传感器还表现出一致的每小时平均日值，强调了现场调节 CO 2 的生物、人为和运输过程的相互作用。
Abstract. Tunable diode laser absorption (TDL) and cavity ring-down spectroscopic (CRDS) sensors for atmospheric carbon dioxide were co-deployed during summer and fall of 2010 in field and laboratory conditions at Los Alamos National Laboratory. Both sensors were characterized for accuracy and precision for ambient carbon dioxide measurements at ground level and compared using both laboratory and ambient field data. After post-processing that included water vapor correction and calibration to WMO reference standards, overall mean [ 12 C 16 O 2 ] = 392.05 ± 8.92 ppm and [ 12 C 16 O 2 ] = 392.22 ± 9.05 ppm were observed between 29 July and 16 August 2010. The mean difference between the CRDS and TDL data for 12 CO 2 was 0.04 ± 1.80 ppm (±1σ in 60 s) for ambient field data, demonstrating the sensors meet the WMO/IAEA compatibility standard. The observations show over the 19-day period the [CO 2 ] CRDS '/[CO 2 ] TDL ratio exhibits a Gaussian distribution centered at x 0 = 1.003 ± 3.38 × 10 −5 (±1σ), indicating the ratio is dominated by random noise as opposed to a bias in the output of either sensor. The CRDS sensor is capable of measuring [ 12 C 16 O 2 ] to a precision of 23 ppb in 1 min and decreases to 6.5 ppb in 58 min. At one and 58-min, the TDL exhibits precisions of 29 ppb and 53 ppb. The CRDS is compact, fast, and stable; the TDL is larger and requires frequent calibrations to maintain its precision. The sensors also exhibit consistent hourly averaged diurnal values underscoring the interplay of biological, anthropogenic, and transport processes regulating CO 2 at the site.