A Lyman-Alpha Hygrometer with Variable Pathlength

Thomas Foken Meteorological Observatory Lindenberg, Lindenberg, Germany

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Arden L. Buck Buck Research, Boulder, Colorado

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Russell A. Nye Buck Research, Boulder, Colorado

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Randy D. Horn Digilog Instruments, Loveland, Colorado

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Abstract

A novel design of a Lyman-alpha hygrometer for surface layer flux measurements is presented using a variable pathlength. The benefit of this device is the capability for in situ calibration during a field experiment with only a short interruption of the measurements of 5 min or less. A description of the device, its operating specifications, and an example of the calibration process are included.

Corresponding author address: Dr. Thomas Foken, Meteorological Observatory, German Weather Service, D-15864 Lindenberg, Germany.

Email: foken@mol.dwd.d400.de

Abstract

A novel design of a Lyman-alpha hygrometer for surface layer flux measurements is presented using a variable pathlength. The benefit of this device is the capability for in situ calibration during a field experiment with only a short interruption of the measurements of 5 min or less. A description of the device, its operating specifications, and an example of the calibration process are included.

Corresponding author address: Dr. Thomas Foken, Meteorological Observatory, German Weather Service, D-15864 Lindenberg, Germany.

Email: foken@mol.dwd.d400.de

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  • Andreas, E. L., 1981: The effect of volume averaging on spectra measured with a Lyman-alpha hygrometer. J. Appl. Meteor.,20, 467–475.

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  • Buck, A. L., 1973: Development of an improved Lyman-alpha hygrometer. Atmos. Technol., 2, 213–240.

  • ——, 1976: The variable-path Lyman-alpha hygrometer and its operating characteristics. Bull. Amer. Meteor. Soc.,57, 1113–1118.

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  • Foken, Th., L. R. Tsvang, S. L. Zubkovskii, and J. Zelený, 1994: Results of turbulence comparison experiments in the middle and east European countries 1981–1990. DWD, Abt. Forschung, Arbeitsergebnisse, Vol. 9, 22 pp. [Available from T. Foken Meteorological Observatory, German Weather Service, D-15864 Lindenberg, Germany.].

  • Krečmer, S. I., and Ju. V. Karpovič, 1973: Maloinercionnyj ul’trafioletovyj vlagomer. Izv. AN SSSR, Fiz. Atmos. Okeana,9, 642–645.

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  • Randall, D. T., T. E. Hanley, and O. K. Larison, 1965: The NRL Lyman-alpha humidiometer. Humidity and Moisture, A. Wexler, Ed., Vol. 1, Reinhold Publishing, 444–454.

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