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evaluation

evaluation. a erosol CCI retrievals Frascati 2013. the choice (?). AATSR F v142 AATSR O v202 AATSR S v040 MERIS A v21 MERIS B v11 MERIS E 802 PARASOL v30 MODIS_aqua c5.1 MODIS_terra c5.1 SEAWIFS MISR v31.

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evaluation

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  1. evaluation aerosol CCI retrievals Frascati 2013

  2. the choice (?) • AATSR F v142 • AATSR O v202 • AATSR S v040 • MERIS A v21 • MERIS B v11 • MERIS E 802 • PARASOL v30 • MODIS_aquac5.1 • MODIS_terrac5.1 • SEAWIFS • MISR v31 • ATSR Swansey algorithm was chosen for multi-year processing (1997-2010) • how much improvement is this retrieval compared to the start of the project? • are there still issues with this retrieval (and where)?

  3. the scoring concept • establish 1x1 gridded AERONET daily data and compare to daily level 3 satellite data • compare (by sub-region) • local time-series (bias, temp. correlation) • daily pattern (bias, spatial correlation) • combine average of the two bias scores with scores for temporal and spatial correlation • combine regional scores into one global score

  4. progress – swansey 4.0 • ATSR Swansey 4.0 errors are smaller than at the start of project ... compared to AERONET spatial error diff overall error diff temporal error diff bias error diff  better scores worse scores 

  5. progress – swansey 4.0 • ATSR Swansey 4.0 errors are NOT smaller than at start of project over oceans - comp to MODIS spatial error diff overall error diff bias error diff temporal error diff  better scores worse scores 

  6. progress – s-4.0 / f-1.42 / o-202 Swansey 4.0 Finland 1.42 Oxford 202  better scores worse scores 

  7. (more) questions … • why is the over ocean performance so poor over oceans (got lost because there are no or not sufficient reference data over oceans) ? • the MODIS reference does not seem the cause since results with POLDER as ref. are similar • looking at sub-scores … the new Swansey bias is actually improved better but spatial and temporal correlation is poorer … why? • is there a processing problem (day offset)

  8. further thoughts • how quickly can the new Swanseyscores over oceans be improved ? • cloud-screening ? • wind-speed dependence of surf reflectance ? • In case of failure are there alternate fall-back options for the 13 year reprocessing • using the “old” Swansey retrieval over ocean ? • using the Finland retrieval over ocean ?

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