Abstract
A high resolution tunable diode laser absorption spectrometer (TDLAS) was used to measure the broadening effect of water vapor and other gases (dry air, nitrogen, oxygen, hydrogen and helium) on three methane lines in the v4 fundamental. The effects on methane eddy correlation flux measurements amount to a few percent for the least broadened line for expected H2O fluxes, to ≈10% for the most broadened line for higher H2O and lower CH4 fluxes likely to be encountered. The broadening coefficients of methane measured for air, N2, O2, and He are in good agreement with recently published values.
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Lübken, FJ., Eng, R., Karecki, D.R. et al. The effect of water vapour broadening on methane eddy correlation flux measurements. J Atmos Chem 13, 97–108 (1991). https://doi.org/10.1007/BF00048103
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DOI: https://doi.org/10.1007/BF00048103