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Published April 22, 2014 | Supplemental Material + Published
Journal Article Open

Influence of vapor wall loss in laboratory chambers on yields of secondary organic aerosol


Atmospheric secondary organic aerosol (SOA) has important impacts on climate and air quality, yet models continue to have difficulty in accurately simulating SOA concentrations. Nearly all SOA models are tied to observations of SOA formation in laboratory chamber experiments. Here, a comprehensive analysis of new experimental results demonstrates that the formation of SOA in laboratory chambers may be substantially suppressed due to losses of SOA-forming vapors to chamber walls, which leads to underestimates of SOA in air-quality and climate models, especially in urban areas where anthropogenic SOA precursors dominate. This analysis provides a time-dependent framework for the interpretation of laboratory chamber experiments that will allow for development of parameterized models of SOA formation that are appropriate for use in atmospheric models.

Additional Information

© 2014 National Academy of Sciences. Freely available online through the PNAS open access option. Contributed by John H. Seinfeld, March 12, 2014 (sent for review January 6, 2014). Published ahead of print April 7, 2014. We thank Alma Hodzic, Julia Lee-Taylor, Sasha Madronich (National Center for Atmospheric Research), Paul Ziemann (University of Colorado Boulder), Paul Wennberg (Caltech), Manabu Shiraiwa (Max Planck Institut für Chemie), and Anthony Wexler (University of California, Davis) for useful discussions. This work was supported by the National Science Foundation Grants ATM-1151062 and AGS-1057183, Department of Energy Grant DE-SC 0006626, and the California Air Resources Board Contract 12-312. X.Z. and C.D.C. contributed equally to this work. Author contributions: X.Z., C.D.C., J.J.E., and J.H.S. designed research; X.Z. performed research; C.D.C., S.H.J., R.C.M., and M.J.K. analyzed data; and C.D.C. and J.H.S. wrote the paper. The authors declare no conflict of interest. This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1404727111/-/DCSupplemental.

Attached Files

Published - PNAS-2014-Zhang-5802-7.pdf

Supplemental Material - sapp.pdf


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