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Type: Journal article
Title: The effects of variations in buffer gas mixing ratios on commercial carbon dioxide cavity ring-down spectroscopy sensors
Author: Long, David A.
Gameson, L.
Truong, Gar-Wing
Bielska, K.
Cygan, A.
Hodges, Joseph T.
Whetstone, James R.
van Zee, Roger D.
Citation: Journal of Atmospheric and Oceanic Technology, 2013; 30(11):2604-2609
Publisher: American Meteorological Society
Issue Date: 2013
ISSN: 1520-0426
School/Discipline: School of Chemistry and Physics
Organisation: Institute for Photonics & Advanced Sensing (IPAS)
Statement of
D. A. Long, L. Gameson, G.-W. Truong, K. Bielska, A. Cygan, J. T. Hodges, J. R. Whetstone and R. D. van Zee
Abstract: Primary gas standards, gas chromatography, and frequency-stabilized cavity ring-down spectroscopy measurements have been used to assess the effect of variations in the argon mixing ratio on the CO2 mixing ratios reported by commercial cavity ring-down spectroscopy sensors. Supporting calculations demonstrate that the use of argon-free, synthetic air standards can lead to a bias of ≈0.7 μmol mol−1 at atmospheric concentration levels of CO2 as a result of pressure-broadening effects. This bias is an order of magnitude greater than the precision of the best commercial sensors and significantly exceeds the World Meteorological Organization's target compatibility goal.
Keywords: In situ atmospheric observations; Instrumentation/sensors; Surface observations
Rights: Copyright status unknown
DOI: 10.1175/JTECH-D-13-00039.1
Appears in Collections:IPAS publications

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