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Towards parameterising atmospheric concentrations of ice-nucleating particles active at moderate supercooling

Mignani, Claudia and Wieder, Jörg and Sprenger, Michael A. and Kanji, Zamin A. and Henneberger, Jan and Alewell, Christine and Conen, Franz. (2021) Towards parameterising atmospheric concentrations of ice-nucleating particles active at moderate supercooling. Atmospheric Chemistry and Physics, 21 (2). pp. 657-664.

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Official URL: https://edoc.unibas.ch/83018/

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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 icenucleating particles (INPs), can trigger initial ice formation at -15 degrees 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 degrees C can be parameterised by different functions of coarse (> 2 mu m) 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.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geowissenschaften > Umweltgeowissenschaften (Alewell)
UniBasel Contributors:Mignani, Claudia and Alewell, Christine and Conen, Franz
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:European Geosciences Union
ISSN:1680-7316
e-ISSN:1680-7324
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:06 Sep 2021 16:16
Deposited On:06 Sep 2021 16:16

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