HR: 17:00h
AN: A32D-05    [PDF]
TI: Comparison of GCM Calculated Aerosol Fields and Their Equivalents From In-Situ and Remote Sensing Measurements
AU: * Stier, P
EM: stier@dkrz.de
AF: Max Planck Institute for Meteorology, Bundesstrasse 55, Hamburg, 20146 Germany
AU: Feichter, J
AF: Max Planck Institute for Meteorology, Bundesstrasse 55, Hamburg, 20146 Germany
AU: Kinne, S
AF: Max Planck Institute for Meteorology, Bundesstrasse 55, Hamburg, 20146 Germany
AU: Vignati, E
AF: Institute for the Environment and Sustainability, European Commission Joint Research Centre, Climate Change Unit TP 280, Ispra, VA 21020 Italy
AU: Wilson, J
AF: Institute for the Environment and Sustainability, European Commission Joint Research Centre, Climate Change Unit TP 280, Ispra, VA 21020 Italy
AU: Boucher, O
AF: Laboratoire d Optique Atmosph\'{e}rique, UFR de Physique, Bat P5, Universite de Lille I, Villeneuve d' Ascq, 59655 France
AB: Aerosols are thought to play an important role in the global climate system. However, their effects on the radiation budget and even their global distribution and composition are not understood satisfactorily. A new aerosol model in the ECHAM5 GCM allows the calculation of the aerosol radiative effects from the explicitly simulated size distribution, composition, and mixing state. It represents the species sulfate, black carbon, organic carbon, sea salt and dust via a superposition of seven log-normal modes. The model treats gas-phase and cloud liquid-phase sulfur chemistry, the nucleation of new sulfate particles, condensation of sulfate on pre-existing particles, coagulation, the transfer of particles from the insoluble to the soluble modes, and the thermodynamic equilibrium with the water vapour phase. Emissions of mineral dust, sea salt and DMS are calculated online. The sink processes sedimentation, dry deposition and wet deposition are treated in dependence of size and composition. For each aerosol mode the optical properties are calculated based on the simulated size and composition to serve as input to the ECHAM5 radiation scheme for simulations of the aerosol radiative effect. To demonstrate the new model's capability, aerosol fields from multi-annual simulations will be presented and compared to available measurements. Modelled aerosol mass, composition, and size-distribution will be evaluated utilizing in-situ surface and aircraft measurements. Simulated aerosol optical depth, absorption, and size-information will be confronted with their remote-sensing derived counterparts from AVHRR, MODIS, TOMS and AERONET.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0305 Aerosols and particles (0345, 4801)
DE: 1610 Atmosphere (0315, 0325)
DE: 1615 Biogeochemical processes (4805)
DE: 3360 Remote sensing
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting