HR: 08:45h
AN: A11C-04    [PDF]
TI: Modeling of Fire-Induced Supercell Convection and Transport of Biomass Burning Aerosol Into the Stratosphere: The Chisholm Fire of 28 May, 2001
AU: * Winterrath, T
EM: twinter@mpch-mainz.mpg.de
AF: Max Planck Institute for Chemistry Biogeochemistry Department, P.O. Box 3060, Mainz, 55020 Germany
AU: Trentmann, J
AF: Department of Atmospheric Sciences University of Washington, Box 351640, Seattle, WA 98195-1640 United States
AU: Textor, C
AF: Laboratoire des Sciences du Climat et de l'Environnement Unite Mixte de Recherche CEA-CNRS, L'Orme de Merisiers, Bat. 709, Gif-Sur-Yvette Cedex, 91191 France
AU: Rosenfeld, D
AF: Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem, 91904 Israel
AU: Fromm, M
AF: Computational Physics, Inc., 8001 Braddock Rd. Suite 210, Springfield, VA 22151 United States
AU: Servranckx, R
AF: Canadian Meteorological Center Meteorological Service of Canada, 2121 North Service Rd. Trans-Canada Highway, Dorval, Qu\'ebec, H9P 1J3 Canada
AU: Wang, P K
AF: Department of Atmospheric and Oceanic Sciences University of Wisconsin-Madison, 1225 W. Dayton Street, Madison, WI 53706 United States
AU: Hobbs, P V
AF: Department of Atmospheric Sciences University of Washington, Box 351640, Seattle, WA 98195-1640 United States
AU: Andreae, M O
AF: Max Planck Institute for Chemistry Biogeochemistry Department, P.O. Box 3060, Mainz, 55020 Germany
AB: Several recent observations provide evidence of the presence of aerosol particles in the lower stratosphere that originate from biomass burning emissions. The long lifetime of particles within the stratosphere enables these emissions to be distributed over a large area. The vertical transport mechanism, which deposits the smoke aerosol into the lower stratosphere, is still uncertain. Direct injection of the fire emissions due to fire-induced convection is one possible transport pathway. Here, we present observations and model results of a wildfire, which took place on 28 May, 2001, near Chisholm, Alberta, Canada. Satellite and radar observations showed the development of a supercell convection above the fire reaching up to the UT/LS as a frontal system approached the fire site. Using the three-dimensional Active Tracer High-Resolution Atmospheric Model (ATHAM) we investigate the importance of the fire-induced convection for the vertical transport of the fire emissions. ATHAM takes into account the heat and aerosol flux from the Chisholm fire, based on available data of the burned fuel and the area burned. The initial meteorological conditions were taken from radiosonde data. To assess the quality of the simulations, we used the model to reproduce the observed dynamical and microphysical features of the convective cloud. Furthermore, the influence of the meteorological conditions and microphysical cloud properties on the injection height are examined.
DE: 0320 Cloud physics and chemistry
DE: 0368 Troposphere--constituent transport and chemistry
DE: 3314 Convective processes
DE: 3362 Stratosphere/troposphere interactions
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting