Assessment of cloud supersaturation by size-resolved aerosol particle and cloud condensation nuclei (CCN) measurements

  • 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 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. A major advantage of the derivation of Slow and Savg from size-resolved CCN efficiency spectra is that it does not require the specific knowledge or assumptions about aerosol hygroscopicity that are needed to derive estimates of Slow, Shigh, and Savg from aerosol size distribution data. For the investigated cloud event, we derived Slow ≈ 0.07–0.25%, Shigh ≈ 0.86–1.31% and Savg ≈ 0.42–0.68%.

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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:30:3-372299
DOI:https://doi.org/10.5194/amt-7-2615-2014
ISSN:1867-8548
ISSN:1867-1381
Parent Title (English):Atmospheric measurement techniques
Publisher:Copernicus Publ.
Place of publication:Göttingen
Document Type:Article
Language:English
Date of Publication (online):2014/08/19
Date of first Publication:2014/08/19
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2015/04/20
Volume:7
Issue:8
Page Number:15
First Page:2615
Last Page:2629
Note:
© Author(s) 2014. This work is distributed under the Creative Commons Attribution 3.0 License.
HeBIS-PPN:368992381
Institutes:Geowissenschaften / Geographie / Geowissenschaften
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - Namensnennung 3.0