Atmospheric Measurement Techniques
Atmospheric Measurement Techniques
AMT
Articles | Volume 19, issue 15
Articles | Volume 19, issue 15
https://doi.org/10.5194/amt-19-5091-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-19-5091-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 19, issue 15
Research article
 | 
07 Aug 2026
Research article |  | 07 Aug 2026

The “Golden Points” and nonequilibrium correction of high-accuracy frost point hygrometers

Yann Poltera, Beiping Luo, Frank G. Wienhold, and Thomas Peter

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Short summary
Chilled mirror hygrometers are the most accurate instruments for measuring water vapor in the upper troposphere and lower stratosphere. The “Golden Points” and nonequilibrium correction are a new post-processing technique for these instruments, which can correct frost point data using mirror reflectance information to achieve unprecedented accuracy of better than 4 % in the H2O mixing ratio, even under rapidly changing humidity conditions, from the ground to the middle stratosphere.
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