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Modeling the Formation and Properties of Traditional and Non-traditional Secondary Organic Aerosol: Problem Formulation and Application to Aircraft Exhaust : Volume 12, Issue 4 (18/04/2012)

By Jathar, S. H.

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Book Id: WPLBN0003982603
Format Type: PDF Article :
File Size: Pages 39
Reproduction Date: 2015

Title: Modeling the Formation and Properties of Traditional and Non-traditional Secondary Organic Aerosol: Problem Formulation and Application to Aircraft Exhaust : Volume 12, Issue 4 (18/04/2012)  
Author: Jathar, S. H.
Volume: Vol. 12, Issue 4
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Presto, A. A., Adams, P. J., Jathar, S. H., Miracolo, M. A., & Robinson, A. L. (2012). Modeling the Formation and Properties of Traditional and Non-traditional Secondary Organic Aerosol: Problem Formulation and Application to Aircraft Exhaust : Volume 12, Issue 4 (18/04/2012). Retrieved from

Description: Engineering and Public Policy, Carnegie Mellon University, Pittsburgh PA, USA. We present a methodology to model secondary organic aerosol (SOA) formation from the photo-oxidation of low-volatility organics (semi-volatile and intermediate volatility organic compounds). The model is parameterized and tested using SOA data collected during two field campaigns that characterized the atmospheric evolution of dilute gas-turbine engine emissions using a smog chamber. Photo-oxidation formed a significant amount of SOA, much of which cannot be explained based on the emissions of traditional, speciated precursors; we refer to this as non-traditional SOA (NT-SOA). The NT-SOA can be explained by emissions of low-volatility organic vapors measured using sorbents. Since these vapors could not be speciated, we employ a volatility-based approach to model NT-SOA formation. We show that the method proposed by Robinson et al. (2007) is unable to explain the timing of NT-SOA formation because it assumes a very modest reduction in volatility of the precursors with every oxidation reaction. In contrast, a Hybrid method, similar to models of traditional SOA formation, assumes a larger reduction in volatility with each oxidation step and results in a better reproduction of NT-SOA formation. The NT-SOA yields estimated for the low-volatility organic vapor emissions are similar to literature data for large n-alkanes and other low-volatility organics. The yields vary with fuel composition (JP8 versus Fischer-Tropsch) and engine load (idle versus non-idle). These differences are consistent with the expected contribution of high (aromatics and n-alkanes) and low (branched alkanes and oxygenated species) SOA forming species to the exhaust.

Modeling the formation and properties of traditional and non-traditional secondary organic aerosol: problem formulation and application to aircraft exhaust

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