Sensitivity analysis of the Ångstrom exponent for multimodal aerosol size distributions

Chang H. Jung, Junshik Um, Ji Yi Lee, Yong P. Kim

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


This study characterizes the Ångstrom exponent for polydispersed aerosol size distributions. Under the assumption of a lognormal size distribution, the dependence of Ångstrom exponent on the size distribution and the refractive index with varying real and imaginary parts are determined. Further, the influence of coarse mode particles on the Ångstrom exponent is investigated quantitatively. The results show that the nuclei mode has less influence under the simulation conditions considered in this study. It is also shown that the refractive index is an important factor influencing the Ångstrom exponent. The effect of the coarse mode on the Ångstrom exponent computed with different aerosol number concentrations and as a function of a geometric standard deviation and a geometric mean diameter is tested. It is shown that the coarse mode is crucial for determining the Ångstrom exponent.

Original languageEnglish
Pages (from-to)625-634
Number of pages10
JournalAsia-Pacific Journal of Atmospheric Sciences
Issue number5
StatePublished - Nov 2013


  • Ångstrom exponent
  • coarse mode
  • polydispersed aerosol size distribution
  • sensitivity analysis


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