title: Particle size distributions of organic aerosol constituents during the 2002 Yosemite Aerosol Characterization Study.
abstract: The 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.
authors.affiliation: Colorado State University, Department of Atmospheric Science, Fort Collins, Colorado 80523-1371, USA.
authors.forename: Pierre
authors.initials: P
authors.lastname: Herckes
authors.forename: Guenter
authors.initials: G
authors.lastname: Engling
authors.forename: Sonia M
authors.initials: SM
authors.lastname: Kreidenweis
authors.forename: Jeffrey L
authors.initials: JL
authors.lastname: Collett
mesh_terms: D000143:Acids / Q000032:analysis; D000336:Aerosols / Q000032:analysis / Q000737:chemistry*; D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000032:analysis / Q000706:statistics & numerical data; D015415:Biomarkers / Q000032:analysis; D002140:California; D002244:Carbon / Q000032:analysis; D003998:Dicarboxylic Acids / Q000032:analysis; D005947:Glucose / Q000031:analogs & derivatives / Q000032:analysis; D009930:Organic Chemicals / Q000032:analysis; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*; D010616:Phenanthrenes / Q000032:analysis; D010636:Phenols / Q000032:analysis; D012906:Smoke / Q000032:analysis; D016008:Statistical Distributions; D013729:Terpenes / Q000032:analysis
chemical_list: D000143:Acids; D000336:Aerosols; D000393:Air Pollutants; D015415:Biomarkers; D003998:Dicarboxylic Acids; D009930:Organic Chemicals; D052638:Particulate Matter; D010616:Phenanthrenes; D010636:Phenols; D012906:Smoke; D013729:Terpenes; C447880:retene; C014989:1,6-anhydro-beta-glucopyranose; D002244:Carbon; D005947:Glucose