Towards parameterising atmospheric concentrations of ice-nucleating particles active at moderate supercooling
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Published:2021-01-18
Issue:2
Volume:21
Page:657-664
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Mignani ClaudiaORCID, Wieder JörgORCID, Sprenger Michael A., Kanji Zamin A.ORCID, Henneberger JanORCID, Alewell Christine, Conen FranzORCID
Abstract
Abstract. A small fraction of freezing cloud droplets probably initiates much of the precipitation above continents. Only a minute fraction of aerosol particles, so-called ice-nucleating particles (INPs), can trigger initial ice formation at −15 ∘C, at which cloud-top temperatures are frequently associated with snowfall. At a mountaintop site in the Swiss Alps, we found that concentrations of INPs active at −15 ∘C can be parameterised by different functions of coarse (> 2 µm) aerosol particle concentrations, depending on whether an air mass is (a) precipitating, (b) non-precipitating, or (c) carrying a substantial fraction of dust particles while non-precipitating. Consequently, we suggest that a parameterisation at moderate supercooling should consider coarse particles in combination with air mass differentiation.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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