Atmos. Chem. Phys. Discuss., 10, 8995-9013, 2010
www.atmos-chem-phys-discuss.net/10/8995/2010/
doi:10.5194/acpd-10-8995-2010
© 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.
Empirical predictions of CCN from aerosol optical properties at four remote sites
A. Jefferson
Cooperative Institute for Research in Environmental Science (CIRES), University of Colorado, Boulder, CO, USA
NOAA Earth System Research Laboratory, Boulder, CO, USA

Abstract. This study presents an empirical method to predict the CCN concentration as a function of percent supersaturation. The aerosol optical properties of backscatter fraction and single scatter albedo function as proxies for the aerosol size and composition in a power law relationship to CCN. This method is tested at four sites with aged aerosol: SGP (Oklahoma, USA), FKB (Black Forest, Germany), HFE (Hefei, China) and GRW (Graciosa, Azores). Each site represents a different aerosol type and thus demonstrates the method robustness and limitations. Good agreement was found between the calculated and measured CCN with slopes between 0.81 and 1.03 and correlation coefficients (r2 values) between 0.59 and 0.67. The fit quality declined at low CCN concentrations in a region with higher data uncertainty.

Citation: Jefferson, A.: Empirical predictions of CCN from aerosol optical properties at four remote sites, Atmos. Chem. Phys. Discuss., 10, 8995-9013, doi:10.5194/acpd-10-8995-2010, 2010.
 
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