Atmospheric ice nuclei at the high-altitude observatory Jungfraujoch, Switzerland
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
ID 3122836
Author(s) Conen, Franz; Rodriguez, Sergio; Hüglin, Christoph; Henne, Stephan; Herrmann, Erik; Bukowiecki, Nicolas; Alewell, Christine
Author(s) at UniBasel Conen, Franz
Alewell, Christine
Bukowiecki, Nicolas
Year 2015
Title Atmospheric ice nuclei at the high-altitude observatory Jungfraujoch, Switzerland
Journal Tellus B: Chemical and Physical Meteorology
Volume 67
Pages / Article-Number 25014
Keywords ice nuclei; slight supercooling; seasonal cycle; desert dust
Mesh terms Science & TechnologyPhysical SciencesMeteorology & Atmospheric SciencesMeteorology & Atmospheric Sciences
Abstract The state of a slightly supercooled ephemeral cloud can be changed by the presence of a few particles capable of catalysing freezing, and potentially result in precipitation. We investigated the atmospheric abundance of particles active as ice nuclei at -8 degrees C (IN-8) over the course of a year at the high-alpine station Jungfraujoch (3580 m.a.s.l., Switzerland) through the use of immersion freezing assays of particles collected on quartz micro-fibre filters. In addition, we determined IN-8 on a hill in the planetary boundary layer 95 km northwest of Jungfraujoch and in the dust laden Saharan Air Layer reaching Tenerife. Results indicate a strong seasonality of IN-8 at Jungfraujoch. Values were largest during summer (between 1 and 10 m(-3)) and about two orders of magnitude smaller during winter. Sahara dust events had a negligible influence on IN-8 at Jungfraujoch. Seasonality in the boundary layer was not observed in the upper, but in the lower bound of IN-8 values. Values <1m(-3) were only found on cold winter days, when IN-8 were more likely to have already been activated and deposited than on warmer days. A good correlation between IN-8 and maximum daily temperature at Jungfraujoch (R-2 = 0.54) suggests IN-8 abundance at Jungfraujoch may be limited most of the year by microphysical processing related to IN activation in approaching air masses.
Publisher Taylor & Francis
ISSN/ISBN 0280-6509 ; 1600-0889
Full Text on edoc No
Digital Object Identifier DOI 10.3402/tellusb.v67.25014
ISI-Number 000349412600001
Document type (ISI) Article

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