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Intercomparison of two cavity ring-down spectroscopy analyzers for atmospheric (CO2)-C-13/(CO2)-C-12 measurement
Pang J. P.; Wen, X. F.; Sun, X. M.; Huang, K.
Source PublicationAtmospheric Measurement Techniques
2016
Volume9
Issue8
Pages3879-3891
Keywordlaser absorption-spectroscopy carbon-dioxide stable-isotopes water-vapor ftir spectroscopy trace-gas co2 spectrometer ratio calibration
AbstractIsotope ratio infrared spectroscopy (IRIS) permits continuous in situ measurement of CO2 isotopic composition under ambient conditions. Previous studies have mainly focused on single IRIS instrument performance; few studies have considered the comparability among different IRIS instruments. In this study, we carried out laboratory and ambient measurements using two Picarro CO2 delta C-13 analyzers (G1101-i and G2201-i (newer version)) and evaluated their performance and comparability. The best precision was 0.08-0.15% for G1101-i and 0.01-0.04% for G2201-i. The dependence of delta C-13 on CO2 concentration was 0.46% per 100 ppm and 0.09% per 100 ppm, the instrument drift ranged from 0.92-1.09% and 0.19-0.37 parts per thousand, and the sensitivity of delta C-13 to the water vapor mixing ratio was 1.01 parts per thousand/% H2O and 0.09 parts per thousand/% H2O for G1101-i and G2201-i, respectively. The accuracy after correction by the two-point mixing ratio gain and offset calibration method ranged from -0.04-0.09 parts per thousand for G1101-i and 0.13-0.03 parts per thousand for G2201-i. The sensitivity of delta C-13 to the water vapor mixing ratio improved from 1.01% / % H2O before the upgrade of G1101-i (G1101-i-original) to 0.15% / % H2O after the upgrade of G1101-i (G1101-i-upgraded). Atmospheric delta C-13 measured by G1101-i and G2201-i captured the rapid changes in atmospheric delta C-13 signals on hourly to diurnal cycle scales, with a difference of 0.07 +/- 0.24% between G1101-i-original and G2201-i and 0.05 +/- 0.30% between G1101-i-upgraded and G2201-i. A significant linear correlation was observed between the delta C-13 difference of G1101i-original and G2201-i and the water vapor concentration, but there was no significant correlation between the delta C-13 difference of G1101-i-upgraded and G2201-i and the water vapor concentration. The difference in the Keeling intercept values decreased from 1.24% between G1101-i-original and G2201-i to 0.36% between G1101-i-upgraded and G2201-i, which indicates the importance of consistency among different IRIS instruments.
Indexed BySCI
Language英语
ISSN1867-1381
DOI10.5194/amt-9-3879-2016
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document TypeSCI/SSCI论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/43161
Collection历年回溯文献
Recommended Citation
GB/T 7714
Pang J. P.,Wen, X. F.,Sun, X. M.,et al. Intercomparison of two cavity ring-down spectroscopy analyzers for atmospheric (CO2)-C-13/(CO2)-C-12 measurement. 2016.
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