Measured and modelled cloud condensation nuclei number concentration at the high alpine site Jungfraujoch
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Authors
Jurányi, Zsófia
DeCarlo, Peter F.
Kammermann, Lukas
Baltensperger, Urs
Author (Corporation)
Publication date
25.08.2010
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Type
01A - Journal article
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Parent work
Atmospheric Chemistry and Physics
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Volume
10
Issue / Number
16
Pages / Duration
7891-7906
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Publisher / Publishing institution
Copernicus
Place of publication / Event location
Göttingen
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Abstract
Atmospheric aerosol particles are able to act as cloud condensation nuclei (CCN) and are therefore important for the climate and the hydrological cycle, but their properties are not fully understood. Total CCN number concentrations at 10 different supersaturations in the range of SS=0.12–1.18% were measured in May 2008 at the remote high alpine research station, Jungfraujoch, Switzerland (3580 m a.s.l.). In this paper, we present a closure study between measured and predicted CCN number concentrations. CCN predictions were done using dry number size distribution (scanning particle mobility sizer, SMPS) and bulk chemical composition data (aerosol mass spectrometer, AMS, and multi-angle absorption photometer, MAAP) in a simplified Köhler theory. The predicted and the measured CCN number concentrations agree very well and are highly correlated. A sensitivity study showed that the temporal variability of the chemical composition at the Jungfraujoch can be neglected for a reliable CCN prediction, whereas it is important to know the mean chemical composition. The exact bias introduced by using a too low or too high hygroscopicity parameter for CCN prediction was further quantified and shown to be substantial for the lowest supersaturation. Despite the high average organic mass fraction (~45%) in the fine mode, there was no indication that the surface tension was substantially reduced at the point of CCN activation. A comparison between hygroscopicity tandem differential mobility analyzer (HTDMA), AMS/MAAP, and CCN derived κ values showed that HTDMA measurements can be used to determine particle hygroscopicity required for CCN predictions if no suitable chemical composition data are available.
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Subject (DDC)
550 - Geowissenschaften
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ISBN
ISSN
1680-7324
1680-7316
1680-7316
Language
English
Created during FHNW affiliation
No
Strategic action fields FHNW
Publication status
Published
Review
Peer review of the complete publication
Open access category
Gold
License
Citation
JURÁNYI, Zsófia, Martin GYSEL, Ernest WEINGARTNER, Peter F. DECARLO, Lukas KAMMERMANN und Urs BALTENSPERGER, 2010. Measured and modelled cloud condensation nuclei number concentration at the high alpine site Jungfraujoch. Atmospheric Chemistry and Physics. 25 August 2010. Bd. 10, Nr. 16, S. 7891–7906. DOI 10.5194/acp-10-7891-2010. Verfügbar unter: https://doi.org/10.26041/fhnw-9674