Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys., 14, 12763-12779, 2014
http://www.atmos-chem-phys.net/14/12763/2014/
doi:10.5194/acp-14-12763-2014
© Author(s) 2014. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
05 Dec 2014
Surface-to-mountaintop transport characterised by radon observations at the Jungfraujoch
A. D. Griffiths1, F. Conen2, E. Weingartner3,*, L. Zimmermann2, S. D. Chambers1, A. G. Williams1, and M. Steinbacher4 1Australian Nuclear Science and Technology Organisation, New South Wales, Australia
2Environmental Geosciences, Department of Geosciences, University of Basel, Basel, Switzerland
3Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
4Swiss Federal Laboratories for Materials Science and Technology (Empa), Dübendorf, Switzerland
*now at: Institute for Aerosol and Sensor Technology, University of Applied Sciences, 5210 Windisch, Switzerland
Abstract. Atmospheric composition measurements at Jungfraujoch are affected intermittently by boundary-layer air which is brought to the station by processes including thermally driven (anabatic) mountain winds. Using observations of radon-222, and a new objective analysis method, we quantify the land-surface influence at Jungfraujoch hour by hour and detect the presence of anabatic winds on a daily basis. During 2010–2011, anabatic winds occurred on 40% of days, but only from April to September. Anabatic wind days were associated with warmer air temperatures over a large fraction of Europe and with a shift in air-mass properties, even when comparing days with a similar mean radon concentration. Excluding days with anabatic winds, however, did not lead to a better definition of the unperturbed aerosol background than a definition based on radon alone. This implies that a radon threshold reliably excludes local influences from both anabatic and non-anabatic vertical-transport processes.

Citation: Griffiths, A. D., Conen, F., Weingartner, E., Zimmermann, L., Chambers, S. D., Williams, A. G., and Steinbacher, M.: Surface-to-mountaintop transport characterised by radon observations at the Jungfraujoch, Atmos. Chem. Phys., 14, 12763-12779, doi:10.5194/acp-14-12763-2014, 2014.
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Short summary
Radon detectors at Bern and Jungfraujoch were used to monitor the transport of radon-rich boundary layer air from the Swiss Plateau to the Alpine ridge. Radon was successfully used to discriminate between different types of vertical transport, using the shape of the diurnal cycle to identify days with upslope mountain winds. For many air-mass properties, however, the total land-surface influence (indicated by the radon concentration) was more decisive than the type of vertical transport.
Radon detectors at Bern and Jungfraujoch were used to monitor the transport of radon-rich...
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