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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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Presentation Transcript
evaluation

evaluation

aerosol CCI

retrievals

Frascati 2013

the choice
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)?
the scoring concept
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
progress swansey 4 0
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 

progress swansey 4 01
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 

progress s 4 0 f 1 42 o 202
progress – s-4.0 / f-1.42 / o-202

Swansey 4.0 Finland 1.42 Oxford 202

 better scores worse scores 

more questions
(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)
further thoughts
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 ?