1. 09 Sept. 2004 ENVISAT symposium, Salzburg Aerosol over land with MERIS, present and future Ramon, D. 1 and Santer, R. 2 (1) HYGEOS, France (2) LISE, Université du Littoral, France

2. 09 Sept. 2004 ENVISAT symposium, Salzburg Where did we start after Salzburg MERIS level 2 products Reprocessing #2 after MAVT Workshop oct. 2003 recommendations  Increase aerosol model number (Angstrom coeff. from 0 to 2.5 by step of 0.1)  Extend the aerosol product spatial cover From Dense Dark Vegetation to Land Aerosol Remote Sensing target

3. 09 Sept. 2004 ENVISAT symposium, Salzburg LARS concept  Surface reflectance varies linearly with some spectral index, here ARVI  ARVI=0  ARVI=-0.2  ARVI=-0.5 100x100 RR around Alta Floresta

4. 09 Sept. 2004 ENVISAT symposium, Salzburg LARS Reflectance for a biome SeasonalInitial DDV slopeDomainInitial DDV

5. 09 Sept. 2004 ENVISAT symposium, Salzburg Biomes

6. 09 Sept. 2004 ENVISAT symposium, Salzburg Biome transition on level 3

7. 09 Sept. 2004 ENVISAT symposium, Salzburg Spatially Complete Global Surface Albedos Derived from Terra/MODIS Data Michael D. King 1, Eric G. Moody 1,2, Steven Platnick 1, and Crystal Schaaf 3 1 NASA Goddard Space Flight Center 2 L3-Communications GSI 3 Boston University Operational MODIS surface albedo data product (MOD43B3/MCD43B3)  0.47, 0.56, 0.67, 0.86, 1.24, 1.64, 2.1 µm, 0.3-5.0, 0.7-5.0, 0.3-0.7 µm  1 km spatial resolution (sinusoidal projection stored as 10° x 10° tiles)  16-day periodicity (001, 017, …, 353)

8. 09 Sept. 2004 ENVISAT symposium, Salzburg 12'x12' box fit   (  ) goodness of fit 16 days period starting from julian day

9. 09 Sept. 2004 ENVISAT symposium, Salzburg 12' resolution, day 177, slope at 659 nm Black: no fit White: no good fit

10. 09 Sept. 2004 ENVISAT symposium, Salzburg 0 0.08 12' resolution, day 177, albedo at 659 nm for ARVI=0.6

11. 09 Sept. 2004 ENVISAT symposium, Salzburg C443 0 1.5

12. 09 Sept. 2004 ENVISAT symposium, Salzburg C670 0 1.5

13. 09 Sept. 2004 ENVISAT symposium, Salzburg New RO_LARS LUTs from MODIS Aerosol product: AOT_865 and alpha

14. 09 Sept. 2004 ENVISAT symposium, Salzburg Remaining issues? See biome transitions on AOT_865 Lot of alpha out of range

15. 09 Sept. 2004 ENVISAT symposium, Salzburg Flags Clouds(White); water (Black),LARS with good aerosol retrieval(Green); Bad aerosol retrieval (Red) LARS in cloud vicinity(Blue)

16. 09 Sept. 2004 ENVISAT symposium, Salzburg AOT_ 865

17. 09 Sept. 2004 ENVISAT symposium, Salzburg RO_LARS_670 DDV albedo (red) corrected LARS albedo (magenta)

18. 09 Sept. 2004 ENVISAT symposium, Salzburg Rayleigh corrected reflectance above LARS at 443nm

19. 09 Sept. 2004 ENVISAT symposium, Salzburg Rayleigh corrected reflectance above LARS at 670 nm

20. 09 Sept. 2004 ENVISAT symposium, Salzburg What aerosol product? RO_AER_440 is correct but improvements are possible RO_AER_670 is questionable L aerosol _440 is OK AOT_440 instead of AOT_865 (no compromise at 670 nm) What about  and the associated Junge size distribution

21. 09 Sept. 2004 ENVISAT symposium, Salzburg The 3 possible algorithms  Simultaneous retrieval of AOT and alpha  AOT for model no 36 (  =1)  Use AOT for model no 36 as back up only

22. 09 Sept. 2004 ENVISAT symposium, Salzburg Spatial & temporal binning (nov.)

23. 09 Sept. 2004 ENVISAT symposium, Salzburg Spatial & temporal binning (sept.)

24. 09 Sept. 2004 ENVISAT symposium, Salzburg Conclusion Separate AOT retrieval and alpha retrieval Coherence with AOT over water No real biome transition found, but need to consolidate with L3 Better cloud rejection at level 2 is mandatory Less problem with a better surface albedo map !

25. 09 Sept. 2004 ENVISAT symposium, Salzburg What next? How to make a good surface albedo map for dark pixels? Utility of a level 2 aerosol product?  On a pixel by pixel basis?  A daily level 3 which is not a simple bining Utility of a daily level 3 aerosol product?  Validation  Atmospheric correction  Upper level