Atmos. Chem. Phys. Discuss., 10, 17073-17111, 2010
www.atmos-chem-phys-discuss.net/10/17073/2010/
doi:10.5194/acpd-10-17073-2010
© Author(s) 2010. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Reconciliation of measurements of hygroscopic growth and critical supersaturation of aerosol particles in Southwest Germany
M. Irwin1, N. Good1, J. Crosier1,2, T. W. Choularton1, and G. McFiggans1
1School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester, UK
2National Centre for Atmospheric Science, University of Manchester, Manchester, UK

Abstract. Aerosol physical, chemical and hygroscopic properties were measured in a range of airmasses during COPS (Convective and Orographically-induced Precipitation Study) ground-based in June and July of 2007 at the Hornisgrinde mountain site in the Black Forest, Southwest Germany. Hygroscopic growth factors at 86% relative humidity were measured and critical supersaturation simultaneously derived for particles of dry diameters 27 to 217 nm, both properties exhibiting substantial variability with time and with particle size.

Variability in the measurements of hygroscopic growth factor and critical supersaturation for particles of similar sizes indicates significant compositional impact on particle water affinity. Critical supersaturation prediction using a single parameter hygroscopicity approximation derived from measured HTDMA mean growth factors deviate, beyond measurement uncertainties, from critical supersaturations derived from CCN measurements. These led to differences averaging around 35% in potential cloud droplet number concentration (CDNC) for the most reliable measurements depending on averaging methodology, often very much larger for individual time periods. This indicates aspects of water uptake behaviour unresolved in this experiment by the single parameter representation which, depending on its origin, may have important consequences on its generalised use.


Citation: Irwin, M., Good, N., Crosier, J., Choularton, T. W., and McFiggans, G.: Reconciliation of measurements of hygroscopic growth and critical supersaturation of aerosol particles in Southwest Germany, Atmos. Chem. Phys. Discuss., 10, 17073-17111, doi:10.5194/acpd-10-17073-2010, 2010.
 
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