Particle size distributions of organic aerosol constituents during the 2002 yosemite aerosol characterization study

Pierre Herckes, Guenter Engling, Sonia M. Kreidenweis, Jeffrey L. Collett

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

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 somefire 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.

Original languageEnglish (US)
Pages (from-to)4554-4562
Number of pages9
JournalEnvironmental Science and Technology
Volume40
Issue number15
DOIs
StatePublished - Aug 1 2006

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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