Atmospheric Measurement Techniques
Atmospheric Measurement Techniques
AMT
Articles | Volume 18, issue 12
Articles | Volume 18, issue 12
https://doi.org/10.5194/amt-18-2591-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/amt-18-2591-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 18, issue 12
Research article
 | 
18 Jun 2025
Research article |  | 18 Jun 2025

A view on recent ice-nucleating particle intercomparison studies: why the uncertainty of the activation temperature matters

Jann Schrod and Heinz G. Bingemer

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Short summary
Ice-nucleating particle (INP) observations often differ by 1 order of magnitude, when multiple instruments measure in parallel. As INP measurements are sensitive to the activation conditions, inaccuracies in the temperature measurement may induce significant deviations in the INP concentration. It was found that typical temperature uncertainties reported in intercomparison studies may explain divergences of a factor of 2 (± 0.5 °C) or 5 to 10 (± 1 °C) between two INP counters with opposite bias.
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The tropopause region in a changing atmosphere (TPChange)...