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Aging of biogenic secondary organic aerosol via gas-phase OH radical reactions

Journal article
Authors N. M. Donahue
K. M. Henry
T. F. Mentel
A. Kiendler-Scharr
C. Spindler
B. Bohn
T. Brauers
H. P. Dorn
H. Fuchs
R. Tillmann
A. Wahner
H. Saathoff
K. H. Naumann
O. Mohler
T. Leisner
L. Muller
M. C. Reinnig
T. Hoffmann
Kent Salo
Mattias Hallquist
M. Frosch
M. Bilde
T. Tritscher
P. Barmet
A. P. Praplan
P. F. DeCarlo
J. Dommen
A. S. H. Prevot
U. Baltensperger
Published in Proceedings of the National Academy of Sciences of the United States of America
Volume 109
Issue 34
Pages 13503-13508
ISSN 0027-8424
Publication year 2012
Published at Department of Chemistry and Molecular Biology
Pages 13503-13508
Language en
Keywords atmospheric chemistry, biosphere-atmosphere interactions, volatility basis-set, alpha-pinene, mass-spectrometer, pinonic acid, ozonolysis, chemistry, chamber, particles, yields, model
Subject categories Chemical Sciences, Environmental chemistry, Environmental Sciences, Climate Research, Analytical Chemistry, Physical Chemistry, Organic Chemistry


The Multiple Chamber Aerosol Chemical Aging Study (MUCHACHAS) tested the hypothesis that hydroxyl radical (OH) aging significantly increases the concentration of first-generation biogenic secondary organic aerosol (SOA). OH is the dominant atmospheric oxidant, and MUCHACHAS employed environmental chambers of very different designs, using multiple OH sources to explore a range of chemical conditions and potential sources of systematic error. We isolated the effect of OH aging, confirming our hypothesis while observing corresponding changes in SOA properties. The mass increases are consistent with an existing gap between global SOA sources and those predicted in models, and can be described by a mechanism suitable for implementation in those models.

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