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Measurement of trace gas fluxes using tunable diode laser spectroscopy

Zahniser, M.S., Nelson, David D., McManus, Barry, Kebabian, Paul L. and Lloyd, David 1995. Measurement of trace gas fluxes using tunable diode laser spectroscopy. Philosophical Transactions of the Royal Society of London. Series A: Physical and Engineering Sciences 351 (1696) , 371--382. 10.1098/rsta.1995.0040

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A fast-response, high precision, tunable diode laser spectrometer has been developed for field measurements of methane and nitrous oxide fluxes using the eddy correlation method. The instrument uses a novel multiple-pass absorption cell with astigmatic mirrors to provide a long absorption path length (36 m) in a small volume (0.3 l). The combination permits rapid response with sufficient sensitivity for eddy correlation flux measurements over a wide range of meteorological conditions. Signal processing uses a least-squares fitting algorithm to determine absolute trace gas concentrations directly from the absorption spectra using spectral line parameters at data rates up to 20 Hz. The precision for methane and nitrous oxide is 0.1% of ambient levels with a 1 s averaging time. Extensions of the method to measurements of surface-reactive gases such as nitric acid and ammonia are possible using rapid sampling techniques to minimize surface interactions.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Last Modified: 20 Feb 2020 10:45

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