Fast chemical sensor for eddy-correlation measurements of methane emissions from rice paddy fields
Anno: 2001
Autori: Werle P., Kormann R.
Affiliazione autori: 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.
Giornale/Rivista: APPLIED OPTICS
Volume: 40 (6) Da Pagina: 846 A: 858
Parole chiavi: Industrial emissions; Methane; Semiconductor lasers; Spectroscopic analysis, Methane emissions, Chemical sensorsDOI: 10.1364/AO.40.000846Citazioni: 47dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-05-18Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui
