HR: 08:45h
AN: A41D-04    [Abstracts]
TI: Biogenic Emission, Oxidation, and Heterogeneous Chemistry at the ICARTT Chebogue Pt Field Site
AU: * Holzinger, R
EM: holzing@nature.berkeley.edu
AF: University of California, Berkeley, Department of Ecosystem Science, Policy & Management, 151 Hilgard Hall, Berkeley, CA 94720 United States
AU: Millet, D B
EM: millet@eps.harvard.edu
AF: University of California, Berkeley, Department of Ecosystem Science, Policy & Management, 151 Hilgard Hall, Berkeley, CA 94720 United States
AU: Millet, D B
EM: millet@eps.harvard.edu
AF: Harvard University, Earth and Planetary Sciences, 29 Oxford Street, Cambridge, MA 02138 United States
AU: Williams, B
EM: brentw@nature.berkeley.edu
AF: University of California, Berkeley, Department of Ecosystem Science, Policy & Management, 151 Hilgard Hall, Berkeley, CA 94720 United States
AU: Kreisberg, N M
EM: nathan@aerosol.us
AF: Aerosol Dynamics Inc., Berkeley, 2329 Fourth Street Berkeley, Berkeley, CA 94710 United States
AU: Goldstein, A H
EM: ahg@nature.berkeley.edu
AF: University of California, Berkeley, Department of Ecosystem Science, Policy & Management, 151 Hilgard Hall, Berkeley, CA 94720 United States
AB: In summer 2004 a field site was set up at Chebogue Point, Nova Scotia, Canada, as part of the ICARTT campaign. Measurements were focused on airborne trace gases as well as physical and chemical properties of aerosols. Individual chemical compounds in aerosols were measured with an hourly time resolution with the newly developed TAG instrument; gas-phase instrumentation included a PTR-MS instrument as well as an automated GC-MS system that measured a wide range of more than 50 trace gases in ambient air. Several compounds were measured by both instruments and the agreement between PTR-MS and GC-MS was generally very good. Besides the broad suite of compounds measured with the GC system, the PTR-MS detected a whole class of oxygenated compounds that were - with the exception of acetaldehyde - missed by GC measurements, among those are acetic acid, acetaldehyde, tentatively identified hydroxyacetone, and unidentified compounds detected at masses 85, 87, 99, 101, 113, and 129. Average daytime concentrations (1000-1600 local time) were 500, 350, 60, 20, 40, 30, 40, 20, and 10 ppt, respectively. The uniqueness of this class of compounds can be shown by means of factor analysis; they are poorly related to trace gases found in the US-outflow, local pollution, primary biogenic emissions and other oxygenated compounds such as acetone, methanol, and MEK. On the other hand these oxygenated VOCs are related to chemical species in aerosols and thus they likely are important species with regard to heterogeneous air chemistry. Presumably, these compounds are oxidation products of locally and/or regionally emitted biogenic VOCs.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0490 Trace gases
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005