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Quantifying regional CCN concentration is important for reliable estimations of aerosol indirect effects.Based on the observational data of the number concentrations of aerosol (NCN) and cloud condensation nuclei (NCCN), particle number size distribution (PNSD), and size-resolved activation ratio obtained on Mt.Huang in southeast China from September 19 to October 11, 2012, seven parameterization schemes are used to calculate the CCN number concentrations.