Measurement of atmospheric NO2 by pulsed cavity ring-down spectroscopy
Measurement of atmospheric NO2 by pulsed cavity ring-down spectroscopy
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DOI：
10.1029/2005jd006942
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发表时间：
2006-06
影响因子：
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通讯作者：
H. Osthoff;S. Brown;T. Ryerson;T. J. Fortin;B. Lerner;E. Williams;A. Pettersson;T. Baynard;W. Dubé;S. Ciciora;A. Ravishankara
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文献类型：
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作者：
H. Osthoff;S. Brown;T. Ryerson;T. J. Fortin;B. Lerner;E. Williams;A. Pettersson;T. Baynard;W. Dubé;S. Ciciora;A. Ravishankara
[1]我们建立了一台脉冲腔衰荡光谱仪(CADS)，用于同时测量大气中的二氧化氮(NO2)、硝酸根(NO3)和五氧化二氮(N2O5)。本文介绍了利用NO2在532 nm处的吸收来测量NO2的仪器的研制。对照NIST可溯源校准标准以及光解化学发光(P-CL)NO2检测器对NO2检测通道进行了校准。测得NO2在5 32 nm处的吸收截面为(1.4 5±0.0 6)×10−19cm2。1个S数据的检测下限(1σ)为40pptv，在实验室条件下，仪器响应精度在±4%(1σ)以内。该仪器的线性动态范围从检测下限到200ppbv以上(R2&gT；99.99%)得到了验证。对于现场测量，有必要校正卡片上的NO2信号，以使其被臭氧吸收。在环境条件下，我们报道了1张S NO2卡的数据，总不确定度为±(4%，60pptv+0.4×(ppbv/ppbv)×03)(1σ)。该仪器是在新英格兰空气质量研究--国际运输和化学转化期间于2004年夏天在NOAA科考船罗纳德·H·布朗号上和2005年冬天在科罗拉多州博尔德部署的。在这两个活动中，CADES和P-CL NO2的测量高度相关(R2>；98%)，这表明除了臭氧之外，在532 nm处没有干扰的气相吸收体，并且CADES适合测量对流层中的NO2。
[1] We have constructed a pulsed cavity ring-down spectrometer (CARDS) for simultaneous measurements of nitrogen dioxide (NO2), the nitrate radical (NO3), and dinitrogen pentoxide (N2O5) in the atmosphere. In this paper, we describe the development of the instrument to measure NO2 via its absorption at 532 nm. The NO2 detection channel was calibrated against a NIST traceable calibration standard as well as a photolysis-chemiluminescence (P-CL) NO2 detector. The absorption cross section of NO2 at 532 nm was determined to be (1.45 ± 0.06) × 10−19 cm2. The NO2 detection limit (1σ) for 1 s data is 40 pptv, and the instrument response is accurate within ±4% (1σ) under laboratory conditions. The linear dynamic range of the instrument has been verified from the detection limit to above 200 ppbv (r2 > 99.99%). For field measurements it is necessary to correct the CARDS NO2 signal for absorption by ozone. Under ambient conditions we report 1 s NO2 CARDS data with total uncertainty ±(4%, 60 pptv + 0.4 × (pptv/ppbv) × O3) (1σ). The instrument was deployed in the field during the New England Air Quality Study–International Transport and Chemical Transformation on board the NOAA research vessel Ronald H. Brown in the summer of 2004 and in Boulder, Colorado, in the winter of 2005. In both campaigns, CARDS and P-CL NO2 measurements were highly correlated (r2 > 98%), indicating the absence of interfering gas phase absorbers at 532 nm other than ozone and the suitability of CARDS to measure NO2 in the troposphere.