Size-dependent aerosol activation at the high-alpine site Jungfraujoch (3580 m asl)

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Authors
Henning, Silvia
Schmidt, Sebastian
Wendisch, Manfred
Gäggeler, Heinz W.
Baltensperger, Urs
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Publication date
01.01.2002
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01A - Journal article
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Tellus B: Chemical and Physical Meteorology
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Volume
54
Issue / Number
1
Pages / Duration
82-95
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Stockholm University Press
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Stockholm
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Abstract
Microphysical and chemical aerosol properties and their influence on cloud formation were studied in a field campaign at the high-alpine site Jungfraujoch (JFJ, 3580 m asl). Due to its altitude, this site is suitable for ground-based in-cloud measurements, with a high cloud frequency of 40%. Dry total and interstitial aerosol size distributions [18 nm 0.15 g mˉ³. Below this value, D50 increased with decreasing LWC. A dependence of D50 on the accumulation mode (Dp>100 nm) number concentration (Ntot,Dp>100) was only found for concentrations less than 100 cmˉ³. For higher values of Ntot,Dp>100 the D50 remained constant. Furthermore, a decrease of the effective radius of cloud droplets (Reff) with increasing Ntot,Dp>100 was observed, providing experimental evidence for the microphysical relation predicted by the Twomey effect. A modified Köhler model was used to quantify the critical supersaturation for the aerosol observed at the JFJ. Ambient supersaturations were determined from the derived supersaturation curve and the calculated D50. As an example, a critical supersaturation of 0.2% was found for 100 nm particles.
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550 - Geowissenschaften
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1600-0889
0280-6509
Language
English
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No
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Published
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Peer review of the complete publication
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Closed
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Citation
HENNING, Silvia, Ernest WEINGARTNER, Sebastian SCHMIDT, Manfred WENDISCH, Heinz W. GÄGGELER und Urs BALTENSPERGER, 2002. Size-dependent aerosol activation at the high-alpine site Jungfraujoch (3580 m asl). Tellus B: Chemical and Physical Meteorology. 1 Januar 2002. Bd. 54, Nr. 1, S. 82–95. DOI 10.3402/tellusb.v54i1.16650. Verfügbar unter: https://irf.fhnw.ch/handle/11654/46833