Aging of biogenic secondary organic aerosol via gas-phase OH radical reactions
Journal article, 2012
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.
biosphere-atmosphere interactions
chemistry
chamber
alpha-pinene
ozonolysis
particles
yields
volatility basis-set
model
pinonic acid
atmospheric chemistry
mass-spectrometer
Author
N. M. Donahue
K. M. Henry
Th. 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
University of Gothenburg
Mattias Hallquist
University of Gothenburg
M. Frosch
M. Bilde
T. Tritscher
P. Barmet
A. P. Praplan
P. F. DeCarlo
J. Dommen
A. S. H. Prevot
U. Baltensperger
Proceedings of the National Academy of Sciences of the United States of America
0027-8424 (ISSN) 1091-6490 (eISSN)
Vol. 109 34 13503-13508Subject Categories
Physical Chemistry
Analytical Chemistry
Chemical Sciences
Environmental Sciences
Climate Research
Organic Chemistry
DOI
10.1073/pnas.1115186109