A new method to accurately relate dry and humidified number size distributions of atmospheric aerosols

摘要

Microphysical calculations of the light-scattering effects as well as the population dynamics of atmospheric aerosols usually require particle size distribution information at atmospheric relative humidity.For technical reasons,however,experimental particle size distributions (e.g.,determined by differential mobility particle sizers) are normally limited to measurements at relative humidities much below deliquescence.Therefore,realistic hygroscopic growth models are needed to calculate aerosol particle sizes under ambient conditions;otherwise,derived light-scattering and population dynamical effects may be greatly misestimated (Hanel,1976).In this work,we present a new method to accurately relate dry and humidified aerosol population size distributions by a descriptive hygroscopic growth factor model,which is based on experimental field observations.