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Particle Size Distributions of Organic Aerosol Constituents during the 2002 Yosemite Aerosol Characterization Study
journal contribution
posted on 2006-08-01, 00:00 authored by Pierre Herckes, Guenter Engling, Sonia M. Kreidenweis, Jeffrey L. CollettThe Yosemite Aerosol Characterization Study (YACS) was
conducted in the summer of 2002 to investigate sources
of regional haze in Yosemite National Park. Organic carbon
and molecular source marker species size distributions
were investigated during hazy and clear periods. More than
75% of the organic carbon mass was associated with
submicron aerosol particles. Most molecular marker species
for wood smoke, an important source of particulate
matter during the study, were contained in submicron
particles, although on some fire influenced days, levoglucosan
shifted toward larger sizes. Various wood smoke marker
species exhibited slightly different size distributions in the
samples, suggesting different, size dependent emission
or atmospheric processing rates of these species. Secondary
biogenic compounds including pinic and pinonic acids
were associated with smaller particles. Pinonaldehyde,
however, exhibited a broader distribution, likely due to its
higher volatility. Dicarboxylic acids were associated
mainly with submicron particles. Hopanes, molecular
markers for vehicle emissions, were mostly contained in
smaller particles but exhibited some tailing into larger size
classes.
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YACSsubmicron aerosol particlesOrganic Aerosol Constituentssource marker species size distributionsacidYosemite National ParkVarious wood smoke marker speciesemissionSecondary biogenic compounds2002 Yosemite Aerosol Characterization StudyThe Yosemite Aerosol Characterization Studysubmicron particlesParticle Size Distributions
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