A Caltech Library Service

A new atmospheric aerosol phase equilibrium model (UHAERO): organic systems

Amundson, N. R. and Caboussat, A. and He, J. W. and Martynenko, A. V. and Landry, C. and Tong, C. and Seinfeld, J. H. (2007) A new atmospheric aerosol phase equilibrium model (UHAERO): organic systems. Atmospheric Chemistry and Physics Discussions, 7 (3). pp. 8709-8754. ISSN 1680-7367.

PDF - Published Version
Creative Commons Attribution.


Use this Persistent URL to link to this item:


In atmospheric aerosols, water and volatile inorganic and organic species are distributed between the gas and aerosol phases in accordance with thermodynamic equilibrium. Within an atmospheric particle, liquid and solid phases can exist at equilibrium. Models exist for computation of phase equilibria for inorganic/water mixtures typical of atmospheric aerosols; when organic species are present, the phase equilibrium problem is complicated by organic/water interactions as well as the potentially large number of organic species. We present here an extension of the UHAERO inorganic thermodynamic model (Amundson et al., 2006c) to organic/water systems. Phase diagrams for a number of model organic/water systems characteristic of both primary and secondary organic aerosols are computed. Also calculated are inorganic/organic/water phase diagrams that show the effect of organics on inorganic deliquescence behavior. The effect of the choice of activity coefficient model for organics on the computed phase equilibria is explored.

Item Type:Article
Related URLs:
URLURL TypeDescription
Seinfeld, J. H.0000-0003-1344-4068
Additional Information:© Author(s) 2007. This work is licensed under a Creative Commons License. Received: 23 May 2007 – Accepted: 11 June 2007 – Published: 22 June 2007. This work was supported by U.S. Environmental Protection Agency grant X-83234201. The third author acknowledges the support by the NSF under Grant No. DMS-0511611.
Funding AgencyGrant Number
Environmental Protection Agency (EPA)X-83234201
Issue or Number:3
Record Number:CaltechAUTHORS:AMUacpd07
Persistent URL:
Official Citation:Amundson, N. R., Caboussat, A., He, J. W., Martynenko, A. V., Landry, C., Tong, C., and Seinfeld, J. H.: A new atmospheric aerosol phase equilibrium model (UHAERO): organic systems, Atmos. Chem. Phys. Discuss., 7, 8709-8754, 2007.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8994
Deposited By: Archive Administrator
Deposited On:12 Oct 2007
Last Modified:02 Oct 2019 23:56

Repository Staff Only: item control page