1. Preliminary Evaluation of a one year reanalysis (2006) of dust simulation with AeroCom tools Michael Schulz Sara Basart, Jose Baldasano, Jean Jacques Morcrette, Angela Benedetti Nicolas Huneeus, Anne Cozic, Jan Griesfeller Carlos Perez Norwegian Meteorological Institute, Oslo, Norway BSC, ECMWF, Columbia University, LSCE

2. Methodology Gathering of one year model data in netcdf format, daily on AeroCom server – BSC-DREAM8b – ECMWF-F026 (assimilating MODISaqua/terra) plus other versions – INCA-forecast plus other versions – NMMB-BSC Analysing daily fields of AOD, coarse mode AOD, emission, wet removal, load, surface concentration of dust Comparing to Aeronet data level 2, sun and sky mode – ( Total AOD@550 ) – Coarse mode AOD@550 Image results accessible via WMO-SDS model subset http://aerocom.met.no/cgi- bin/aerocom/surfobs_annualrs.pl?MODELLIST=WMO-SDS

3. Location of sites for North Africa evaluation where comparison is performed

4. Coarse mode aerosol optical thickness BSC-DREAM ECMWF INCANMMB-2000

5. April-June 2006, Coarse mode AOD Transport from Sahel out to Atlantic BSC-DREAM AERONET ECMWFassim AERONET Agoufou Sahel CapoVerde west

6. April-June 2006, Coarse mode AOD Transport across the Mediterranean BSC-DREAM AERONET ECMWFassim AERONET ForthCrete Toulon

7. Evaluation against coarse mode AOD from Aeronet over Northern Africa 2006 BSC-DREAM ECMWF INCANMMB-2000

8. Dust Load and dust AOD MEC 0.65 m2 g-1 MEC 0.58 m2 g-1 BSC-DREAM ECMWF

9. Proposition for joint study to explore usage of coarse AOD for evaluation  Complete and check diagnostics, newer model versions? Retrieve size from all tracer 3D field…  Correct budget analysis and analyse dust life time  Use non-assimilated ECMWF model version for comparison of impact of assimilation  Explore the contribution of other components to coarse AOD, remove cases which are not dust dominated  Investigate on annual basis: which cases are well captured, which pose problems  Add more models ?? Other years ??