HR: 0800h
AN: A41A-0008    [Abstracts]
TI: Aerosol Growth Observed in a Sierra Nevada Pine Forest and its Relationship to Biogenic Volatile Organic Compounds and Anthropogenic Pollutants
AU: * Lunden, M M
EM: MMLunden@lbl.gov
AF: Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd. MS 51R0208, Berkeley, CA 94720-8108 United States
AU: Black, D R
EM: DRBlack@lbl.gov
AF: Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd. MS 51R0208, Berkeley, CA 94720-8108 United States
AU: Brown, N J
EM: NJBrown@lbl.gov
AF: Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd. MS 51R0208, Berkeley, CA 94720-8108 United States
AU: Lee, A
EM: alee@nature.berkeley.edu
AF: Division of Ecosystem Sciences, Department of Environmental Science, Policy, and Management, University of California, Berkeley, Berkeley, CA 94720-3110 United States
AU: Schade, G W
EM: gws@iup.physik.uni-bremen.de
AF: Division of Ecosystem Sciences, Department of Environmental Science, Policy, and Management, University of California, Berkeley, Berkeley, CA 94720-3110 United States
AU: McKay, M
EM: megan@nature.berkeley.edu
AF: Division of Ecosystem Sciences, Department of Environmental Science, Policy, and Management, University of California, Berkeley, Berkeley, CA 94720-3110 United States
AU: Goldstein, A H
EM: ahg@nature.berkeley.edu
AF: Division of Ecosystem Sciences, Department of Environmental Science, Policy, and Management, University of California, Berkeley, Berkeley, CA 94720-3110 United States
AB: Forested ecosystems emit significant amounts of volatile organic compounds (VOCs), which impact atmospheric photochemistry through ozone and aerosol production. To study biosphere-atmosphere exchange of ozone and VOCs and their effects on aerosol formation and processing, we have conducted a study at the Blodgett Forest Research Station in the Sierra Nevada Mountains of California. The research site includes automated instrumentation for the in-situ measurement of concentration and biosphere-atmosphere flux of VOCs, ozone, aerosol integrated and size resolved instrumentation, and meteorological variables. The meteorology at the site is fairly consistent with daytime upslope flows carrying pollutants from the Sacramento Valley and evening drainage flows bringing cleaner air from the Sierra Nevada Mountains. Preliminary results have shown that particle concentrations are correlated with both biogenic (alpha-pinene and isoprene) and anthropogenic (toluene) VOC concentrations. In addition, the growth of small, nuclei model particles (<20nm) has been observed just after noon on many days. This presentation will focus on the diurnal aerosol patterns observed at the site, the relative importance of anthropogenic and biogenic sources for aerosol concentrations, and the relationships between VOC measurements, meteorology, and particle formation events. Experimental yield data will be used with measured fine mode aerosol data and measured VOC concentration gradients and fluxes to investigate whether oxidation of various organic precursors can account for the observed aerosol growth.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0315 Biosphere/atmosphere interactions
DE: 0325 Evolution of the atmosphere
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting