HR: 1340h
AN: A53C-1337    [Abstracts]
TI: Improved temporal constraints on and vertical injections of biomass burning emissions: Implications on global aerosol simulation
AU: * Chen, Y
EM: Yang.Chen@jpl.nasa.gov
AF: JPL, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, United States
AU: Li, Q
EM: Qinbin.Li@jpl.nasa.gov
AF: JPL, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, United States
AU: Randerson, J
EM: jranders@uci.edu
AF: University of California, Irvine, University of California, Irvine, Irvine, CA 92697, United States
AU: Lyons, E
EM: elyons@uci.edu
AF: University of California, Irvine, University of California, Irvine, Irvine, CA 92697, United States
AU: Nelson, D
EM: David.L.Nelson@jpl.nasa.gov
AF: JPL, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, United States
AU: Diner, D
EM: David.J.Diner@jpl.nasa.gov
AF: JPL, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, United States
AU: Kahn, R
EM: Ralph.Kahn@jpl.nasa.gov
AF: JPL, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, United States
AB: Biomass burning from wild fires is a major source of air pollutants including aerosols and some other climate forcing agents. Biomass burning emissions are typically prescribed on a monthly base in most global chemistry and transport models (CTMs). We investigated the sensitivity of global aerosol transport and distribution to the diurnal cycle, synoptic variability, and vertical injection height of biomass burning emissions. Global simulations of aerosols were conducted using the GEOS-Chem global 3-D chemistry and transport model for summer 2004, with the aforementioned constraints imposed on the 8-day Global Fire Emissions Database (GFED v2). The diurnal cycle was determined using active fire data. The synoptic variability, which depends on temperature, relative humidity, and wind speed, was derived from a fire model. The injection height was derived from MISR smoke plume stereoheights. Model results, with monthly or 8-day (with or without the additional constraints) biomass burning emissions, were compared with aerosol optical depths (AOD) from MISR/MODIS/OMI and the AERONET network, and (mass) concentrations from the IMPROVE network and the INTEX-NA aircraft campaign. Using 8-day instead of monthly biomass burning emissions significantly improves the comparison of mass concentrations of BC, OC, and sulfate with observations. The inclusion of diurnal cycle, synoptic variability, and vertical injection height in the 8-day biomass burning emission inventory lead to more efficient transport of aerosols out of the boundary layer, resulting in lower aerosol loadings over the biomass burning source regions and higher loadings downwind, compared with simulations with monthly inventory. The inclusion of the additional constraints also reduces the discrepancies, both in magnitude and daily variability, between observed and simulated aerosol optical depths (AODs), especially downwind of the biomass burning source regions.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0466 Modeling
DE: 0478 Pollution: urban, regional and global (0345, 4251)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting