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In this study, seven binary and one ternary nucleation parameterizations are examined under a variety of atmospheric conditions with temperatures of 240-300 K, relative humidities of 5-95%, number concentrations of sulfuric acid of 10E4-10E11 molecules cm-3 and mixing ratios of ammonia of 0.1-100 ppt. Significant differences are found among the binary nucleation rates calculated with different parameterizations (e.g., by 7 orders of magnitude under a temperature of 258 K, a relative humidity of 50%, and an ambient sulfuric acid concentration of 10E9 molecules cm-3) and between the binary and ternary nucleation rates (e.g., by 3-4 orders of magnitude under a temperature of 258 K, a relative humidity of 50%, an ambient sulfuric acid concentration of 10E9 molecules cm-3, and an ambient ammonia concentration of 10 ppt). These parameterizations will be further evaluated in a 3-D air quality model using available measurements to assess the appropriateness of these parameterizations in reproducing number concentrations and size distributions of PM2.5, the associated uncertainties and implications.
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