Open-path tunable diode laser absorption for eddy correlation flux measurements of atmospheric trace gases

Stuart M. Anderson; Mark S. Zahniser

doi:10.1117/12.46163

1 May 1991 Open-path tunable diode laser absorption for eddy correlation flux measurements of atmospheric trace gases

Stuart M. Anderson, Mark S. Zahniser

Proceedings Volume 1433, Measurement of Atmospheric Gases; (1991) https://doi.org/10.1117/12.46163
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States

Abstract

Biogenic emissions from and dry deposition to terrestrial surfaces are important processes determining the trace gas composition of the atmosphere. We have developed an instrument for flux measurements of gases such as CH4, N2O, and O3 based on the eddy correlation technique which combines trace gas fluctuation measurements with simultaneous windfield measurements. The instrument combines a tunable diode laser infrared light source with an open-path multipass absorption cell in order to provide the fast time response (approximately equals 0.1 s) and short base pathlength (0.6 m) required for the eddy correlation method. Initial field tests using the instrument to measure methane emissions from a local wetland demonstrate the capability for high precision eddy correlation flux measurements.

Citation Download Citation

Stuart M. Anderson and Mark S. Zahniser "Open-path tunable diode laser absorption for eddy correlation flux measurements of atmospheric trace gases", Proc. SPIE 1433, Measurement of Atmospheric Gases, (1 May 1991); https://doi.org/10.1117/12.46163

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