Articles | Volume 14, issue 1
Atmos. Meas. Tech., 14, 239–268, 2021
https://doi.org/10.5194/amt-14-239-2021

Special issue: StratoClim stratospheric and upper tropospheric processes...

Atmos. Meas. Tech., 14, 239–268, 2021
https://doi.org/10.5194/amt-14-239-2021

Research article 14 Jan 2021

Research article | 14 Jan 2021

Understanding balloon-borne frost point hygrometer measurements after contamination by mixed-phase clouds

Teresa Jorge et al.

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Interactive discussion

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Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision
AR by Teresa Jorge on behalf of the Authors (19 Oct 2020)  Author's response    Manuscript
ED: Publish subject to technical corrections (06 Nov 2020) by Gabriele Stiller
AR by Teresa Jorge on behalf of the Authors (10 Nov 2020)  Author's response    Manuscript
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Short summary
Balloon-borne frost point hygrometers are crucial for the monitoring of water vapour in the upper troposphere and lower stratosphere. We found that when traversing a mixed-phase cloud with big supercooled droplets, the intake tube of the instrument collects on its inner surface a high percentage of these droplets. The newly formed ice layer will sublimate at higher levels and contaminate the measurement. The balloon is also a source of contamination, but only at higher levels during the ascent.