HR: 1330h
AN: A22B-1068    [PDF]
TI: Comparing Measurements and Chemical Model Simulations of Smoke Plumes From an African Savanna and an Alaskan Boreal Fire
AU: * Trentmann, J
EM: jtrent@atmos.washington.edu
AF: Dept. of Atmospheric Sciences, University of Washington, Box 351640, Seattle, WA 98195-1640 United States
AU: Winterrath, T
EM: twinter@mpch-mainz.mpg.de
AF: Max Planck Institute for Chemistry, Dept. Biogeochemistry, P.O. Box 3060, Mainz, 55020 Germany
AU: Mason, S A
AF: SUNY College at Fredonia, 220 Houghton Hall, Fredonia, NY 14063 United States
AU: Christian, T J
AF: Dept. of Chemistry, University of Montana, Missoula, MT 59807 United States
AU: Yokelson, R J
AF: Dept. of Chemistry, University of Montana, Missoula, MT 59807 United States
AU: Andreae, M O
AF: Max Planck Institute for Chemistry, Dept. Biogeochemistry, P.O. Box 3060, Mainz, 55020 Germany
AU: Hobbs, P V
AF: Dept. of Atmospheric Sciences, University of Washington, Box 351640, Seattle, WA 98195-1640 United States
AB: Chemical processes in young plumes from biomass burning significantly modify the initial emissions. Field measurements show that the ratio between ozone and CO significantly increases during the first two hours following emissions into the atmosphere. Decreases in enhancement ratios have been measured for a number of hydrocarbons. Understanding the chemical reactions that lead to these fast changes is important in order to address the local and regional impacts of vegetation fires and the effects of biomass burning on atmospheric chemistry in general. Measurements in plumes from two fires in different environments (African savanna, Alaskan forest/shrub/bog mosaic) will be described and compared with simulations using a box-dilution model. In both plumes, the measurements revealed a rapid increase in the ozone mixing ratio. Model simulations, using commonly employed emissions, are not able to quantitatively reproduce the measured ozone production in these plumes. Inclusion of the emissions of recently measured higher and oxygenated hydrocarbons (e.g., furan) significantly improves the model simulations, especially for the plume from the Alaskan fire. The effects of the different emission ratios, solar inclination etc. in these scenarios on photochemical reactions in the two fire plumes are explored through the model simulations.
DE: 0315 Biosphere/atmosphere interactions
DE: 0317 Chemical kinetic and photochemical properties
DE: 0365 Troposphere--composition and chemistry
DE: 0368 Troposphere--constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting