Atmospheric ice nuclei at the high-altitude observatory Jungfraujoch, Switzerland

Conen, Franz and Rodriguez, Sergio and Hüglin, Christoph and Henne, Stephan and Herrmann, Erik and Bukowiecki, Nicolas and Alewell, Christine. (2015) Atmospheric ice nuclei at the high-altitude observatory Jungfraujoch, Switzerland. Tellus B: Chemical and Physical Meteorology, 67. p. 25014.

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Official URL: http://edoc.unibas.ch/dok/A6381890

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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.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geowissenschaften > Umweltgeowissenschaften (Alewell)
UniBasel Contributors:Conen, Franz and Alewell, Christine and Bukowiecki, Nicolas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Taylor & Francis
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:27 May 2020 08:51
Deposited On:05 Jun 2015 08:53

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