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Predicting abundance and variability of ice nucleating particles in precipitation at the high-altitude observatory Jungfraujoch
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
ID 3566522
Author(s) Stopelli, Emiliano; Conen, Franz; Morris, C. E.; Herrmann, Erik; Henne, Stephan; Steinbacher, Martin; Alewell, Christine
Author(s) at UniBasel Stopelli, Emiliano
Conen, Franz
Alewell, Christine
Year 2016
Title Predicting abundance and variability of ice nucleating particles in precipitation at the high-altitude observatory Jungfraujoch
Journal Atmospheric chemistry and physics
Volume 16
Number 13
Pages / Article-Number 8341-8351
Abstract Nucleation of ice affects the properties of clouds and the formation of precipitation. Quantitative data on how ice nucleating particles (INPs) determine the distribution, occurrence and intensity of precipitation are still scarce. INPs active at −8 °C (INPs −8 ) were observed for 2 years in precipitation samples at the High-Altitude Research Station Jungfraujoch (Switzerland) at 3580 m a.s.l. Several environmental parameters were scanned for their capability to predict the observed abundance and variability of INPs −8 . Those singularly presenting the best correlations with observed number of INPs −8 (residual fraction of water vapour, wind speed, air temperature, number of particles with diameter larger than 0.5 µm, season, and source region of particles) were implemented as potential predictor variables in statistical multiple linear regression models. These models were calibrated with 84 precipitation samples collected during the first year of observations; their predictive power was successively validated on the set of 15 precipitation samples collected during the second year. The model performing best in calibration and validation explains more than 75 % of the whole variability of INPs −8 in precipitation and indicates that a high abundance of INPs −8 is to be expected whenever high wind speed coincides with air masses having experienced little or no precipitation prior to sampling. Such conditions occur during frontal passages, often accompanied by precipitation. Therefore, the circumstances when INPs −8 could be sufficiently abundant to initiate the ice phase in clouds may frequently coincide with meteorological conditions favourable to the onset of precipitation events.
Publisher Copernicus Publ.
ISSN/ISBN 1680-7316
Full Text on edoc No
Digital Object Identifier DOI 10.5194/acp-16-8341-2016
ISI-Number WOS:000381091400018
Document type (ISI) Article

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