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Atmospheric ice nuclei at the high-altitude observatory Jungfraujoch, Switzerland
Title: Atmospheric ice nuclei at the high-altitude observatory Jungfraujoch, Switzerland
Authors: Conen, FranzRodríguez González, Sergio ORCID RESEARCHERID Autor AEMETHüglin, ChristophHenne, StephanHerrmann, ErikBukowiecki, NicolasAlewell, Christine
Keywords: Núcleo glaciógeno; Polvo desértico; Ice nuclei; Desert dust
Issue Date: 2015
Publisher: Taylor & Francis
Citation: Tellus B. 2015, 67, p. 25014
Publisher version:
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°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<1 m−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 (R2=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.
Sponsorship : OPC data were acquired by Paul Scherrer Institute in the framework of the Global Atmosphere Watch (GAW) programme funded by MeteoSwiss with further support provided by FP7 project BACCHUS (grant agreement no. 603445). Measurements at Izan˜ a are part of the Global Atmospheric Watch program funded by AEMET and the Minister of Economy and Competitiveness of Spain (project POLLINDUST, CGL2011-26259).
ISSN: 1600-0889
Appears in Collections:Artículos científicos 2015-2018

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