Fast chemical sensor for eddy-correlation measurements of methane emissions from rice paddy fields

Year: 2001

Authors: Werle P., Kormann R.

Autors Affiliation: Fraunhofer Institut (IFU), Kreuzeckbahnstrasse 19, Garmisch-Partenkirchen, 82467, Germany; Max-Planck Institut für Chemie, Saarstrasse 23, Mainz, 55020, Germany

Abstract: A high-frequency-modulation spectrometer with a lead-salt diode laser operating in the v4 band of CH4 at 7.8 µm was used as a fast chemical sensor to measure ambient methane concentrations of 2 ppmv (parts in 106 volume-mixing ratio) with a time resolution of 10 Hz for micrometeorological flux measurements. To assess the quality of the data on methane emissions from rice paddy fields, we compared eddy-correlation measurements with simultaneously recorded emission data from the state-of-the-art closed-chamber technique and showed that the closed-chamber measurements were 60%-90% higher than were the eddy-correlation measurements during the campaign. This outcome demonstrates that diode-laser spectroscopy is a valuable tool for quality assurance.

Journal/Review: APPLIED OPTICS

Volume: 40 (6)      Pages from: 846  to: 858

KeyWords: Industrial emissions; Methane; Semiconductor lasers; Spectroscopic analysis, Methane emissions, Chemical sensors
DOI: 10.1364/AO.40.000846

ImpactFactor: 1.459
Citations: 47
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