Scientific Results

Measurement of trace gas fluxes using tunable diode laser spectroscopy

Year: 1999

Authors: Werle P., Kormann R.

Autors Affiliation: Fraunhofer Inst for Atmospheric, Environmental Research, Garmisch-Partenkirchen, Germany

Abstract: A fast tunable diode laser sensor has been applied for micrometeorological flux measurement of methane emissions from rice paddy fields in order to assess the quality of data on methane fluxes and allow a comparison with simultaneously recorded data provided by the closed chamber method. Systematic differences between chamber and the eddy correlation technique have been found and it seems that chamber measurements overestimate the actual emission up to 70%. This finding demonstrates once more that TDLAS is a valuable tool for atmospheric research and quality assurance.

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KeyWords: Gas emissions; Methane; Optical sensors; Semiconductor lasers; Spectroscopic analysis, Closed chamber method; Tunable diode laser (TDL) spectroscopy, Trace analysis
DOI: 10.1117/12.364173

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