ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-12-615-2012 A two-dimensional volatility basis set – Part 2: Diagnostics of organic-aerosol evolution Donahue N. M. 1 Kroll J. H. 2 Pandis S. N. 1 3 Robinson A. L. 1 Carnegie Mellon University Center for Atmospheric Particle Studies, Pittsburgh, USA MIT Departments of Civil and Environmental Engineering and Chemical Engineering, Cambridge, USA Institute of Chemical Engineering and High Temperature Processes, FORTH, Patras, Greece 16 01 2012 12 2 615 634 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/12/615/2012/acp-12-615-2012.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/12/615/2012/acp-12-615-2012.pdf

We discuss the use of a two-dimensional volatility-oxidation space (2-D-VBS) to describe organic-aerosol chemical evolution. The space is built around two coordinates, volatility and the degree of oxidation, both of which can be constrained observationally or specified for known molecules. Earlier work presented the thermodynamics of organics forming the foundation of this 2-D-VBS, allowing us to define the <i>average</i> composition (C, H, and O) of organics, including organic aerosol (OA) based on volatility and oxidation state. Here we discuss how we can analyze experimental data, using the 2-D-VBS to gain fundamental insight into organic-aerosol chemistry. We first present a well-understood "traditional" secondary organic aerosol (SOA) system – SOA from <i>α</i>-pinene + ozone, and then turn to two examples of "non-traditional" SOA formation – SOA from wood smoke and dilute diesel-engine emissions. Finally, we discuss the broader implications of this analysis.

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