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Diffusion-Limited Versus Quasi-Equilibrium Aerosol Growth

Zhang, Xi and Pandis, Spyros N. and Seinfeld, John H. (2012) Diffusion-Limited Versus Quasi-Equilibrium Aerosol Growth. Aerosol Science and Technology, 46 (8). pp. 874-885. ISSN 0278-6826. doi:10.1080/02786826.2012.679344.

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Condensation of gas-phase material onto particulate matter is the predominant route by which atmospheric aerosols evolve. The traditional approach to representing formation of secondary organic aerosols (SOAs) is to assume instantaneous partitioning equilibrium of semivolatile organic compounds between gas and particle phases. Growth occurs as the vapor concentration of the species increases owing to gas-phase chemistry. The fundamental mathematical basis of such a condensation growth mechanism (quasi-equilibrium growth) has been lacking. Analytical solutions for the evolution of an organic aerosol size distribution undergoing quasi-equilibrium growth and irreversible diffusion-limited growth are obtained for open and closed systems. The quasi-equilibrium growth emerges as a limiting case for semivolatile species condensation when the rate of change of the ambient vapor concentration is slow compared with the rate of establishment of local gas-aerosol equilibrium. The results suggest that the growth mechanism in a particular situation might be inferred from the characteristics of the evolving size distribution. In certain conditions, a bimodal size distribution can occur during the condensation of a single species on an initially unimodal distribution.

Item Type:Article
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URLURL TypeDescription
Pandis, Spyros N.0000-0001-8085-9795
Seinfeld, John H.0000-0003-1344-4068
Additional Information:© 2012 American Association for Aerosol Research. Received 29 November 2011; accepted 19 March 2012; Available online 13 Jun 2012. This work was supported by National Science Foundation grant AGS-1057183. The authors wish to acknowledge helpful discussions with Dr. Jeff Pierce.
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Issue or Number:8
Record Number:CaltechAUTHORS:20120619-093050732
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Official Citation:Xi Zhang, Spyros N. Pandis & John H. Seinfeld (2012): Diffusion-Limited Versus Quasi-Equilibrium Aerosol Growth, Aerosol Science and Technology, 46:8, 874-885
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:31947
Deposited By: Aucoeur Ngo
Deposited On:19 Jun 2012 18:34
Last Modified:09 Nov 2021 20:02

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