A new low-power, open-path instrument for measuring methane flux by eddy covariance

This paper describes a new low-power instrument for measuring methane flux by eddy covariance method at sites without grid power. Design and field performance of the LI-7700 Methane Analyzer (LI-COR Biosciences) are examined in this study. The instrument uses 8 W of power in steady-state operation a...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2011-02, Vol.102 (2), p.391-405
Main Authors: McDermitt, D., Burba, G., Xu, L., Anderson, T., Komissarov, A., Riensche, B., Schedlbauer, J., Starr, G., Zona, D., Oechel, W., Oberbauer, S., Hastings, S.
Format: Article
Language:English
Subjects:
Covariance
Density
Eddies
Engineering
Flux
Fluxes
Lasers
Mathematical models
Measuring instruments
Methane
Optical Devices
Optics
Photonics
Physical Chemistry
Physics
Physics and Astronomy
Quantum Optics
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Summary:This paper describes a new low-power instrument for measuring methane flux by eddy covariance method at sites without grid power. Design and field performance of the LI-7700 Methane Analyzer (LI-COR Biosciences) are examined in this study. The instrument uses 8 W of power in steady-state operation and employs a tunable diode laser in an open Herriott cell configuration with 0.47 m base path and 30 m optical path length. Methane number density is measured using wavelength modulation spectroscopy (WMS) with 2f detection. Typical signal noise is
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-010-4307-0