Ramon d 1 and santer r 2 hygeos france lise universit du littoral france
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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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Aerosol over land with MERIS, present and future

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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


Biomes

Biomes


Biome transition on level 3

Biome transition on level 3


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


Aerosol over land with meris present and future

16 days period starting from julian day

r0(l1)

12'x12' box fit

goodness of fit


Aerosol over land with meris present and future

12' resolution, day 177, slope at 659 nm

Black: no fit

White: no good fit


Aerosol over land with meris present and future

12' resolution, day 177, albedo at 659 nm for ARVI=0.6

0.08

0


Aerosol over land with meris present and future

C443

1.5

0


Aerosol over land with meris present and future

C670

1.5

0


Aerosol over land with meris present and future

  • New RO_LARS LUTs from MODIS

  • Aerosol product: AOT_865 and alpha


Remaining issues

Remaining issues?

  • See biome transitions on AOT_865

  • Lot of alpha out of range


Flags

Flags

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

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


Aot 865

AOT_865


Ro lars 670

RO_LARS_670

DDV albedo (red) corrected LARS albedo (magenta)


Rayleigh corrected reflectance above lars at 443nm

Rayleigh corrected reflectance above LARS at 443nm


Rayleigh corrected reflectance above lars at 670 nm

Rayleigh corrected reflectance above LARS at 670 nm


What aerosol product

What aerosol product?

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

  • Simultaneous retrieval of AOT and alpha

  • AOT for model no 36 (a=1)

  • Use AOT for model no 36 as back up only


Spatial temporal binning nov

Spatial & temporal binning (nov.)


Spatial temporal binning sept

Spatial & temporal binning (sept.)


Conclusion

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 !


What next

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


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