The effect of water vapour broadening on methane eddy correlation flux measurements |
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| Authors: | F-J Lübken R Eng D R Karecki G I Mackay S Nadler H I Schiff |
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| Institution: | (1) Unisearch Associates Inc., 222 Snidercroft Road, L4K 1B5 Concord, Ontario, Canada;(2) Present address: Physikalisches Institut der Universität Bonn, Nussallee 12, 5300 Bonn 1, Germany |
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| 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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| Keywords: | Methane flux broadening coefficient eddy correlation technique |
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