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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/amt-2017-353
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
20 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).
Comparison of the fast Lyman-Alpha and LICOR hygrometers for measuring airborne turbulent fluctuations
Astrid Lampert1, Jörg Hartmann2, Falk Pätzold1, Lennart Lobitz1, Peter Hecker1, Katrin Kohnert3, Eric Larmanou3,4, Andrei Serafimovich3, and Torsten Sachs3 1Institute of Flight Guidance, TU Braunschweig, Hermann-Blenk-Str. 27, 38108 Braunschweig, Germany
2Alfred Wegener Institute for Polar and Marine Research, Bussestr. 24, 27570 Bremerhaven, Germany
3GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany
4Swedish University of Agricultural Sciences, Umeå, Sweden
Abstract. The properties of fast hygrometers, the Lyman-Alpha and different LICOR humidity sensors, are analysed in direct intercomparison flights on different airborne platforms. One vibration isolated closed-path and two non-isolated open path LICOR sensors were installed on the twin engine turbo-prop aircraft Dornier 128. The closed-path sensor provided absolute values and fluctuations of the water vapour mixing ratio in good agreement with the Lyman-Alpha. The signals of the two open-path sensors showed considerable high frequency noise, and the absolute value of the mixing ratio was observed to drift with time in this vibrational environment.

On the helicopter-towed sonde Helipod with very low vibration level the open-path LICOR sensor agreed very well with the Lyman-Alpha over the entire frequency range up to 3 Hz.

The results show that the LICOR sensors are well suited for airborne measurements of humidity fluctuations, provided that a vibrationsless environment is given, and this turns out to be more important than close sensor spacing.


Citation: Lampert, A., Hartmann, J., Pätzold, F., Lobitz, L., Hecker, P., Kohnert, K., Larmanou, E., Serafimovich, A., and Sachs, T.: Comparison of the fast Lyman-Alpha and LICOR hygrometers for measuring airborne turbulent fluctuations, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-353, in review, 2017.
Astrid Lampert et al.
Astrid Lampert et al.
Astrid Lampert et al.

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Short summary
We compared two different fast response humidity sensors simultaneously on different airborne platforms. One is the well-establed Lyman-Alpha hygrometer that has been used for decades for fast airborne humidity measurements. The other is the Licor hygrometer. For an environment of low vibrations, the Licor is suitable for fast airborne water vapour observations.
We compared two different fast response humidity sensors simultaneously on different airborne...
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