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A two-dimensional volatility basis set - Part 2: Diagnostics of organic-aerosol evolution

TLDR
In this article, the authors use a 2D-Voxidation space to describe organic-aerosol chemical evolution, based on two coordinates, volatility and the degree of oxidation, which can be constrained observationally or specified for known molecules.
Abstract
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 thermodynam- ics of organics forming the foundation of this 2-D-VBS, al- lowing us to define the average composition (C, H, and O) of organics, including organic aerosol (OA) based on volatility and oxidation state. Here we discuss how we can analyze ex- perimental data, using the 2-D-VBS to gain fundamental in- sight into organic-aerosol chemistry. We first present a well- understood "traditional" secondary organic aerosol (SOA) system - SOA from -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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Citations
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Journal ArticleDOI

Chemistry of atmospheric brown carbon.

TL;DR: Understanding of the climate-related properties of atmospheric OC is still incomplete and the specific ways in which OC impacts atmospheric environment and climate forcing are just beginning to be understood.

Secondary Organic Aerosol Formation from Anthropogenic Air Pollution: Rapid and Higher than Expected

TL;DR: This paper showed that reactive anthropogenic VOCs (AVOCs) produce much larger amounts of SOA than these models predict, even shortly after sunrise, and a significant fraction of the excess SOA is formed from first-generation AVOC oxidation products.
Journal ArticleDOI

Formation of Urban Fine Particulate Matter

TL;DR: Air pollutants consist of a complex combination of gases and particulate matter, which is emitted directly into the atmosphere or formed in the atmosphere through gas-to-particle conversion (secondary) (Figure 1).
References
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Journal ArticleDOI

Evolution of Organic Aerosols in the Atmosphere

Jose L. Jimenez, +66 more
- 11 Dec 2009 - 
TL;DR: A unifying model framework describing the atmospheric evolution of OA that is constrained by high–time-resolution measurements of its composition, volatility, and oxidation state is presented, which can serve as a basis for improving parameterizations in regional and global models.
Journal ArticleDOI

Organic aerosol and global climate modelling: a review

TL;DR: In this article, the authors reviewed existing knowledge with regard to organic aerosol (OA) of importance for global climate modelling and defined critical gaps needed to reduce the involved uncertainties, and synthesized the information to provide a continuous analysis of the flow from the emitted material to the atmosphere up to the point of the climate impact of the produced organic aerosols.
Journal ArticleDOI

Rethinking Organic Aerosols: Semivolatile Emissions and Photochemical Aging

TL;DR: Accounting for partitioning and photochemical processing of primary emissions creates a more regionally distributed aerosol and brings model predictions into better agreement with observations, attribute this unexplained secondary organic-aerosol production to the oxidation of low-volatility gas-phase species.
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Evolution of Organic Aerosols in the Atmosphere

Jose L. Jimenez, +66 more
- 11 Dec 2009 -