Articles | Volume 10, issue 14
Atmos. Chem. Phys., 10, 6855–6861, 2010
https://doi.org/10.5194/acp-10-6855-2010
Atmos. Chem. Phys., 10, 6855–6861, 2010
https://doi.org/10.5194/acp-10-6855-2010

  23 Jul 2010

23 Jul 2010

Empirical estimates of CCN from aerosol optical properties at four remote sites

A. Jefferson 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 estimate the CCN concentration as a function of percent supersaturation. The aerosol optical properties, 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.

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