Speciated measurements of semivolatile and intermediate volatility organic compounds (S/IVOCs) in a pine forest during BEACHON-RoMBAS 2011
Abstract
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, H_2O, 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 C_(15)H_(24) (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 C_(15)H_(22), 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 of 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.
Additional Information
© 2016 Author(s). CC Attribution 3.0 License. Published by Copernicus Publications on behalf of the European Geosciences Union. Received: 14 Jul 2015. Published in Atmos. Chem. Phys. Discuss.: 20 Aug 2015. Revised: 22 Dec 2015. Accepted: 13 Jan 2016. Published: 02 Feb 2016. The authors would like to acknowledge funding from the National Science Foundation (Rapid Award Number 1135745), Department of Energy (SBIR Award Number DE-FG02-08ER85160) and the Austrian Science Fund (FWF project number L518-N20). The authors would like to thank Andrew Turnipseed for use of trace gas and meteorological measurements and Brett Palm, Amber Ortega, and Patrick Hayes for use of AMS measurements. The authors would also like to thank Jim Smith, John Ortega, and NCAR for organizing the logistics of BEACHON-RoMBAS 2011. P. Campuzano-Jost, D. A. Day, and J. L. Jimenez were supported by NSF AGS-1243354, NOAA NA13OAR4310063, and DOE(BER/ASR) DE-SC0011105. L. Kaser is a recipient of a DOC-fFORTE Fellowship of the Austrian Academy of Science. Edited by: J. Rinne.Attached Files
Published - acp-16-1187-2016.pdf
Supplemental Material - acp-16-1187-2016-supplement.pdf
Files
Name | Size | Download all |
---|---|---|
md5:eb62ecbda99e551273c1b04367854f45
|
1.5 MB | Preview Download |
md5:a427f336e36c11c1475a8aaa4466f12e
|
695.2 kB | Preview Download |
Additional details
- Eprint ID
- 65690
- Resolver ID
- CaltechAUTHORS:20160325-144844698
- 1135745
- NSF
- DE-FG02-08ER85160
- Department of Energy (DOE)
- L518-N20
- FWF Der Wissenschaftsfonds
- AGS-1243354
- NSF
- NA13OAR4310063
- National Oceanic and Atmospheric Administration (NOAA)
- DE-SC0011105
- Department of Energy (DOE)
- Österreichische Akademie der Wissenschaften
- Created
-
2016-03-29Created from EPrint's datestamp field
- Updated
-
2023-10-18Created from EPrint's last_modified field