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Title: Speciated measurements of semivolatile and intermediate volatility organic compounds (S/IVOCs) in a pine forest during BEACHON-RoMBAS 2011

Understanding organic composition of gases and particles is essential to identifying sources and atmospheric processing leading to organic aerosols (OA), but atmospheric chemical complexity and the analytical techniques available often limit such analysis. Here we present speciated measurements of semivolatile and intermediate volatility organic compounds (S/IVOCs) using a novel dual-use instrument (SV-TAG-AMS) deployed at Manitou Forest, CO, during the Bio-hydro-atmosphere interactions of Energy, Aerosols, Carbon, H2O, Organics & Nitrogen – Rocky Mountain Biogenic Aerosol Study (BEACHON-RoMBAS) 2011 campaign. This instrument provides on-line speciation of ambient organic compounds with 2 h time resolution. The species in this volatility range are complex in composition, but their chemical identities reveal potential sources. Observed compounds of biogenic origin include sesquiterpenes with molecular formula C15H24 (e.g., β-caryophyllene and longifolene), which were most abundant at night. A variety of other biogenic compounds were observed, including sesquiterpenoids with molecular formula C15H22, abietatriene and other terpenoid compounds. Many of these compounds have been identified in essential oils and branch enclosure studies but were observed in ambient air for the first time in our study. Semivolatile polycyclic aromatic hydrocarbons (PAHs) and alkanes were observed with highest concentrations during the day and the dependence on temperature suggests the role ofmore » an evaporative source. Using statistical analysis by positive matrix factorization (PMF), we classify observed S/IVOCs by their likely sources and processes, and characterize them based on chemical composition. The total mass concentration of elutable S/IVOCs was estimated to be on the order of 0.7 µg m–3 and their volatility distributions are estimated for modeling aerosol formation chemistry.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [4] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] ;  [12] ;  [12] ;  [4] ;  [2] ;  [13]
  1. Univ. of California, Berkeley, CA (United States); Univ. of Toronto, Toronto, ON (Canada)
  2. Aerosol Dynamics Inc., Berkeley, CA (United States)
  3. Aerodyne Research Inc., Billerica, MA (United States); Forschungszentrum Julich, Julich (Germany)
  4. Univ. of Colorado, Boulder, CO (United States)
  5. Univ. of California, Berkeley, CA (United States); Carnegie Mellon Univ., Pittsburgh, PA (United States)
  6. Univ. of Innsbruck, Innsbruck (Austria); National Center for Atmospheric Research, Boulder, CO (United States)
  7. National Center for Atmospheric Research, Boulder, CO (United States)
  8. Univ. of Innsbruck, Innsbruck (Austria)
  9. Aerosol Dynamics Inc., Berkeley, CA (United States); California Institute of Technology, Pasadena, CA (United States)
  10. Univ. of California, Berkeley, CA (United States); California Air Resources Board, Sacramento, CA (United States)
  11. Aerodyne Research Inc., Billerica, MA (United States); Univ. of Colorado, Boulder, CO (United States)
  12. Aerodyne Research Inc., Billerica, MA (United States)
  13. Univ. of California, Berkeley, CA (United States)
Publication Date:
OSTI Identifier:
1253625
Grant/Contract Number:
FG02-08ER85160
Type:
Accepted Manuscript
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
Journal Name: Atmospheric Chemistry and Physics (Online); Journal Volume: 16; Journal Issue: 2; Journal ID: ISSN 1680-7324
Publisher:
European Geosciences Union
Research Org:
Aerodyne Research, Inc., Billerica, MA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English