HR: 17:15h
AN: A32D-06    [PDF]
TI: Global Modeling of Tropospheric Aerosols by LLNL IMPACT and Comparisons with Field and Satellite Measurements
AU: * Chuang, C C
EM: chuan1@llnl.gov
AF: Lawrence Livermore National Lab, 7000 East Ave., Livermore, Ca 94550 United States
AU: Bergmann, D J
EM: bergmann1@llnl.gov
AF: Lawrence Livermore National Lab, 7000 East Ave., Livermore, Ca 94550 United States
AU: Connell, P S
EM: connell2@llnl.gov
AF: Lawrence Livermore National Lab, 7000 East Ave., Livermore, Ca 94550 United States
AU: Cameron-Smith, P J
EM: pjc@llnl.gov
AF: Lawrence Livermore National Lab, 7000 East Ave., Livermore, Ca 94550 United States
AU: Dignon, J E
EM: jane@scuba.llnl.gov
AF: Lawrence Livermore National Lab, 7000 East Ave., Livermore, Ca 94550 United States
AB: A new version of LLNL IMPACT (Integrated Massively Parallel Atmospheric Chemical Transport) model driven by NCAR CCM3 has been used to study the global aerosol cycle in the troposphere. We will present global distributions of five major aerosol components (sulfate, organic carbon, black carbon, dust, and sea salt) and their seasonal variations. Emissions of sulfate, organic carbon, and black carbon are based on available emission inventories while emissions of dust and sea salt particles are calculated in the model to be consistent to the instantaneous local meteorology. This new version with a compact sulfur chemical mechanism (~21 prognostic species) is aiming at developing the aerosol climatology and exploring the impact of aerosols on climate variability and climate change. By applying the monthly averages of O3, OH, HO2, and H2O2 from previous IMPACT simulations with full chemistry (~100 prognostic species), sulfate is formed through both gas and aqueous oxidation from SO2 and DMS emissions. Other aerosol types are assumed to be injected into the global model in the particulate form. We will compare the aerosol optical thickness with satellite measurements and examine the consistency of the individual aerosol concentrations to field measurements at different geographical locations to evaluate the accuracy of the model. * Work performed under the auspices of the U.S. Department of Energy by the University of California, Lawrence Livermore National Laboratory under contract No. W-7405-Eng-48.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 1704 Atmospheric sciences
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting