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The effect of water vapour broadening on methane eddy correlation flux measurements

✍ Scribed by F.-J. Lübken; R. Eng; D. R. Karecki; G. I. Mackay; S. Nadler; H. I. Schiff

Publisher
Springer Netherlands
Year
1991
Tongue
English
Weight
594 KB
Volume
13
Category
Article
ISSN
0167-7764

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✦ Synopsis

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 H20 fluxes, to ~-10% for the most broadened line for higher H20 and lower CH 4 fluxes likely to be encountered. The broadening coefficients of methane measured for air, N 2, 02, and He are in good agreement with recently published values.

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