HR: 16:15h
AN: A32D-02    [PDF]
TI: AEROCOM - First Results from the Global Aerosol Model Intercomparison Project
AU: * Textor, C
EM: textor@lsce.saclay.cea.fr
AF: Laboratoire des Sciences du Climat et de l'Environnement, Orme des Merisiers, Gif-sur-Yvette CEDEX, 91191 France
AU: Schulz, M
EM: schulz@lsce.saclay.cea.fr
AF: Laboratoire des Sciences du Climat et de l'Environnement, Orme des Merisiers, Gif-sur-Yvette CEDEX, 91191 France
AU: Kinne, S S
EM: kinne@dkrz.de
AF: Max Planck Institute for Meteorology, Bundestrasse 55, Hamburg, 20146 Germany
AU: Guibert, S
EM: guibert@lsce.saclay.cea.fr
AF: Laboratoire des Sciences du Climat et de l'Environnement, Orme des Merisiers, Gif-sur-Yvette CEDEX, 91191 France
AB: Aerosols play an important, but not well-quantified role in Earth's global climate. Aerosols exert a direct radiative effect, and they also influence the radiative properties of clouds. Observations from satellites and from the ground are currently not sufficient to adequately characterize the nature and distribution of aerosols in the atmosphere. However, numerical simulations of aerosols in global models that are carefully evaluated with observations facilitate the investigation of aerosol effects on the climate system. A number of complex multi-component aerosol modules embedded in various global models has been developed in recent years. Initial comparisons among these models and comparisons of the model results to remote sensing data (e.g., Penner et al. and Kinne et al.) indicated a need for more detailed assessments, which are now performed within AEROCOM. Anonymized results from the first experiment with about 10 models will be presented. The different models have either been forced with meteorological data for the year 1996, 1997, 2000, 2001, or have been run in a climatological mode. We focus on five aerosol components: dust, sea salt, sulfate, black carbon and organic particulate matter. The model results are compared with each other and with new remote sensing measurements of aerosols from ground and space. We will analyze simulations of total aerosol load and of single components in the atmosphere. We try to explain differences in the results from different models by examining the individual parameterizations of the physical processes and of the sources. Among others we will present the aerosol distribution in atmosphere, and particle compositions and sizes. The removal processes (wet and dry deposition, gravitational settling) will be investigated and budgets will be shown. We aim at an evaluation of the quality of aerosol simulation in current global models. The simulated optical properties of the aerosol will be studied and compared with satellite data to get a more realistic assessment of the aerosol's impact on climate.
UR: http://nansen.ipsl.jussieu.fr/AEROCOM
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0322 Constituent sources and sinks
DE: 0325 Evolution of the atmosphere
DE: 1610 Atmosphere (0315, 0325)
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting