Assessment of cloud supersaturation by aerosol particle and cloud condensation nuclei (CCN) measurements [Discussion paper]

In this study we show how size-resolved measurements of aerosol particles and cloud condensation nuclei (CCN) can be used to characterize the supersaturation of water vapor in a cloud. The method was developed and applie
In this study we show how size-resolved measurements of aerosol particles and cloud condensation nuclei (CCN) can be used to characterize the supersaturation of water vapor in a cloud. The method was developed and applied for the investigation of a cloud event during the ACRIDICON-Zugspitze campaign (17 September to 4 October 2012) at the high-alpine research station Schneefernerhaus (German Alps, 2650 m a.s.l.). Number size distributions of total and interstitial aerosol particles were measured with a scanning mobility particle sizer (SMPS), and size-resolved CCN efficiency spectra were recorded with a CCN counter system operated at different supersaturation levels.
During the evolution of a cloud, aerosol particles are exposed to different supersaturation levels. We outline and compare different estimates for the lower and upper bounds (Slow, Shigh) and the average value (Savg) of peak supersaturation encountered by the particles in the cloud. For the investigated cloud event, we derived Slow ≈ 0.19–0.25%, Shigh ≈ 0.90–1.64% and Savg ≈ 0.38–0.84%. Estimates of Slow, Shigh and Savg based on aerosol size distribution data require specific knowledge or assumptions of aerosol hygroscopicity, which are not required for the derivation of Slow and Savg from the size-resolved CCN efficiency spectra.
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Author:Mira L. Krüger, Stephan Mertes, Thomas Klimach, Ya F. Cheng, Hang Su, Johannes Schneider, Meinrat O. Andreae, Ulrich Pöschl, Diana Rose
URN:urn:nbn:de:hebis:30:3-372282
DOI:http://dx.doi.org/10.5194/amtd-6-10021-2013
ISSN:1867-8610
Parent Title (English):Atmospheric measurement techniques discussions
Publisher:Copernicus
Place of publication:Katlenburg-Lindau
Document Type:Article
Language:English
Date of Publication (online):2013/11/15
Date of first Publication:2013/11/15
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2015/04/20
Volume:6
Pagenumber:18
First Page:10021
Last Page:10056
Note:
© Author(s) 2013. This work is distributed under the Creative Commons Attribution 3.0 License.
HeBIS PPN:368991636
Institutes:Geowissenschaften
Dewey Decimal Classification:550 Geowissenschaften
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - Namensnennung 3.0

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