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Fast chemical sensor for eddy-correlation measurements of methane emissions from rice paddy fields
A high-frequency-modulation spectrometer with a lead-salt diode laser operating in the 4 band of CH 4 at 7.8 m was used as a fast chemical sensor to measure ambient methane concentrations of 2 ppmv ͑parts in 10 6 volume-mixing ratio͒ 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-artdoi:10.1364/ao.40.000846 pmid:18357065 fatcat:x6h2xtfoufa2bj5omvpzijeyqy