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Ramon, D. 1 and Santer, R. 2 HYGEOS, France LISE, Université du Littoral, France. Aerosol over land with MERIS, present and future. Where did we start after Salzburg. MERIS level 2 products Reprocessing #2 after MAVT Workshop oct. 2003 recommendations

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Ramon d 1 and santer r 2 hygeos france lise universit du littoral france

Ramon, D.1 and Santer, R.2

HYGEOS, France

LISE, Université du Littoral, France

Aerosol over land with MERIS, present and future


Where did we start after 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


Lars concept
LARS concept

  • Surface reflectance varies linearly with some spectral index, here ARVI

100x100 RR

around

Alta Floresta

DARVI=0

DARVI=-0.2

DARVI=-0.5


Lars reflectance for a biome
LARS Reflectance for a biome

slope

Initial DDV

Domain

Seasonal

Initial DDV




Spatially complete global surface albedos derived from terra modis data

Spatially Complete Global Surface Albedos Derived from Terra/MODIS Data

  • 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)

Michael D. King1, Eric G. Moody1,2, Steven Platnick1, and Crystal Schaaf3

1NASA Goddard Space Flight Center

2L3-Communications GSI

3Boston University


16 days period starting from julian day Terra/MODIS Data

r0(l1)

12'x12' box fit

goodness of fit


12' resolution, day 177, slope at 659 nm Terra/MODIS Data

Black: no fit

White: no good fit



C443 Terra/MODIS Data

1.5

0


C670 Terra/MODIS Data

1.5

0



Remaining issues
Remaining issues? Terra/MODIS Data

  • See biome transitions on AOT_865

  • Lot of alpha out of range


Flags
Flags Terra/MODIS Data

Clouds(White); water (Black),LARS with good aerosol retrieval(Green);

Bad aerosol retrieval (Red) LARS in cloud vicinity(Blue)


Aot 865
AOT_865 Terra/MODIS Data


Ro lars 670
RO_LARS_670 Terra/MODIS Data

DDV albedo (red) corrected LARS albedo (magenta)




What aerosol product
What aerosol product? Terra/MODIS Data

RO_AER_440 is correct but improvements are possible

RO_AER_670 is questionable

Laerosol _440 is OK

AOT_440 instead of AOT_865 (no compromise at 670 nm)

What about a and the associated Junge size distribution


The 3 possible algorithms
The 3 possible algorithms Terra/MODIS Data

  • Simultaneous retrieval of AOT and alpha

  • AOT for model no 36 (a=1)

  • Use AOT for model no 36 as back up only




Conclusion
Conclusion Terra/MODIS Data

  • 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 !


What next
What next? Terra/MODIS Data

  • 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


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