[article] 
A two-dimensional volatility basis set: 1. organic-aerosol mixing thermodynamics
Available online: http://dx.doi.org/10.5194/acp-11-3303-2011
N.M. Donahue ; S.A. Epstein ; S.N. Pandis ; A.L. Robinson
in Atmospheric Chemistry and Physics (ACP) >
Vol. 11. N° 7 [04/01/2011] . - p.3303-3318
We develop the thermodynamic underpinnings of a two-dimensional volatility basis set (2D-VBS) employing saturation mass concentration (Co) and the oxygen content (O:C) to describe volatility, mixing thermodynamics, and chemical evolution of organic aerosol. The work addresses a simple question: "Can we reasonably constrain organic-aerosol composition in the atmosphere based on only two measurable organic properties, volatility and the extent of oxygenation?" This is an extension of our earlier one-dimensional approach employing volatility only (C* = γ Co, where γ is an activity coefficient). Using available constraints on bulk organic-aerosol composition, we argue that one can reasonably predict the composition of organics (carbon, oxygen and hydrogen numbers) given a location in the Co – O:C space. Further, we argue that we can constrain the activity coefficients at various locations in this space based on the O:C of the organic aerosol.
Language(s): English
Format: Digital (Free)Tags: Aerosols ; Research 
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