skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: FDATMOS16 non-linear partitioning and organic volatility distributions in urban aerosols

Abstract

Gas-to-particle partitioning of organic aerosols (OA) is represented in most models by Raoult’s law, and depends on the existing mass of particles into which organic gases can dissolve. This raises the possibility of non-linear response of particle-phase OA to the emissions of precursor volatile organic compounds (VOCs) that contribute to this partitioning mass. Implications for air quality management are evident: A strong non-linear dependence would suggest that reductions in VOC emission would have a more-than-proportionate benefit in lowering ambient OA concentrations. Chamber measurements on simple VOC mixtures generally confirm the non-linear scaling between OA and VOCs, usually stated as a mass-dependence of the measured OA yields. However, for realistic ambient conditions including urban settings, no single component dominates the composition of the organic particles, and deviations from linearity are presumed to be small. Here we re-examine the linearity question using volatility spectra from several sources: (1) chamber studies of selected aerosols, (2) volatility inferred for aerosols sampled in two megacities, Mexico City and Paris, and (3) an explicit chemistry model (GECKO-A). These few available volatility distributions suggest that urban OA may be only slightly super-linear, with most values of the sensitivity exponent in the range 1.1-1.3, also substantially lower thanmore » seen in chambers for some specific aerosols. Furthermore, the rather low values suggest that OA concentrations in megacities are not an inevitable convergence of non-linear effects, but can be addressed (much like in smaller urban areas) by proportionate reductions in emissions.« less

Authors:
 [1];  [2];  [1];  [1];  [1];  [3]
  1. National Center for Atmospheric Research, Boulder, CO (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. CNRS, Univ. Paris Est Creteil et Univ., Creteil (France)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1245388
Report Number(s):
BNL-111945-2016-JA
Journal ID: ISSN 1359-6640; FDISE6; R&D Project: 2016-BNL-EE630EECA-Budg; KP1701000
Grant/Contract Number:  
SC00112704
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Faraday Discussions
Additional Journal Information:
Journal Volume: 19; Journal Issue: 1; Journal ID: ISSN 1359-6640
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Madronich, Sasha, Kleinman, Larry, Conley, Andrew, Lee-Taylor, Julie, Hodzic, A., and Aumont, Bernard. FDATMOS16 non-linear partitioning and organic volatility distributions in urban aerosols. United States: N. p., 2015. Web. doi:10.1039/C5FD00209E.
Madronich, Sasha, Kleinman, Larry, Conley, Andrew, Lee-Taylor, Julie, Hodzic, A., & Aumont, Bernard. FDATMOS16 non-linear partitioning and organic volatility distributions in urban aerosols. United States. https://doi.org/10.1039/C5FD00209E
Madronich, Sasha, Kleinman, Larry, Conley, Andrew, Lee-Taylor, Julie, Hodzic, A., and Aumont, Bernard. 2015. "FDATMOS16 non-linear partitioning and organic volatility distributions in urban aerosols". United States. https://doi.org/10.1039/C5FD00209E. https://www.osti.gov/servlets/purl/1245388.
@article{osti_1245388,
title = {FDATMOS16 non-linear partitioning and organic volatility distributions in urban aerosols},
author = {Madronich, Sasha and Kleinman, Larry and Conley, Andrew and Lee-Taylor, Julie and Hodzic, A. and Aumont, Bernard},
abstractNote = {Gas-to-particle partitioning of organic aerosols (OA) is represented in most models by Raoult’s law, and depends on the existing mass of particles into which organic gases can dissolve. This raises the possibility of non-linear response of particle-phase OA to the emissions of precursor volatile organic compounds (VOCs) that contribute to this partitioning mass. Implications for air quality management are evident: A strong non-linear dependence would suggest that reductions in VOC emission would have a more-than-proportionate benefit in lowering ambient OA concentrations. Chamber measurements on simple VOC mixtures generally confirm the non-linear scaling between OA and VOCs, usually stated as a mass-dependence of the measured OA yields. However, for realistic ambient conditions including urban settings, no single component dominates the composition of the organic particles, and deviations from linearity are presumed to be small. Here we re-examine the linearity question using volatility spectra from several sources: (1) chamber studies of selected aerosols, (2) volatility inferred for aerosols sampled in two megacities, Mexico City and Paris, and (3) an explicit chemistry model (GECKO-A). These few available volatility distributions suggest that urban OA may be only slightly super-linear, with most values of the sensitivity exponent in the range 1.1-1.3, also substantially lower than seen in chambers for some specific aerosols. Furthermore, the rather low values suggest that OA concentrations in megacities are not an inevitable convergence of non-linear effects, but can be addressed (much like in smaller urban areas) by proportionate reductions in emissions.},
doi = {10.1039/C5FD00209E},
url = {https://www.osti.gov/biblio/1245388}, journal = {Faraday Discussions},
issn = {1359-6640},
number = 1,
volume = 19,
place = {United States},
year = {2015},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 1 work
Citation information provided by
Web of Science

Save / Share: