Calculating AODs from MODIS radiances
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Calculating AODs from MODIS Calculating AODs from MODIS radiances radiances Easan Drury Easan Drury G4 - w/ Jacob group @ Harvard G4 - w/ Jacob group @ Harvard July 22, 2004 July 3, 2004
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Calculating AODs from MODIS radiances. July 3, 2004. July 22, 2004. Easan Drury G4 - w/ Jacob group @ Harvard. Inferring AODs from MODIS radiances ( and using MODIS radiances as the observational variable for constraining modeled aerosols ). α AEROSOL. α MOLECULAR. α SURFACE. - PowerPoint PPT Presentation
Transcript of Calculating AODs from MODIS radiances
Calculating AODs from MODIS radiancesCalculating AODs from MODIS radiances
Easan DruryEasan DruryG4 - w/ Jacob group @ HarvardG4 - w/ Jacob group @ Harvard
July 22, 2004July 3, 2004
Inferring AODs from MODIS radiances ( and using MODIS radiances as the observational variable for constraining modeled aerosols )
αMOLECULAR αAEROSOLαSURFACE
Molecular scattering & absorbing
Aerosol scattering & absorbing
Surface reflectance
2nd assumption 1st assumptionWhat we want!
αMOLECULAR αSURFACEαAEROSOL
MODIS (visible) (visible/IR) MODIS (IR)
1 aerosol molecular
o
T
Inferring Surface AlbedoInferring Surface Albedo
Visible to IR reflectances:
• Top of the atmosphere reflectance for the 1x1.25 degree bin.
• Regress the bottom quartile of visible to IR reflectance.
Reflectance ratios during July-August, 2004:
GEOS-Chem optical propertiesGEOS-Chem optical properties
MODIS & AERONET AODs
AERONET - MODIS AODs
Fraction of Pixels used
Difference in 10x10km2 MODIS and AERONET AODs
