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Oberpfaffenhofen

AATSR-DV

The AATSR-Dual View (DV) algorithm uses the atmospheric reflectance at TOA measured by AATSR at two viewing angles, to eliminate the effect of the surface reflectance on the reflectance measured at the top of the atmosphere (TOA). The path reflectance is retained and used with the calculated reflection at TOA due to a mixture of aerosol models to retrieve the AOD. A large number of aerosol mixtures are used to obtain the most appropriate aerosol mixture based on error minimization using all suitable wavelengths. To account for interactions, the TOA reflection is calculated including molecular effects. The final result is the AOD at 0.55, 0.67 and 1.6m over land; over ocean the AOD at 0.55, 0.67, 0.86 and 1.6m is retrieved using a single view. The retrieval is currently done on either individual pixels or for 10x10 pixels.

Example result / latest result (if near-real time)

 

Satellite: ENVISAT (ESA)
Instrument(s): AATSR
Algorithm PI: Gerrit de Leeuw
Algorithm Development: Pekka Kolmonen
Contact details: gerrit.leeuw@fmi.fi
Parameter(s): over land: spectral AOD at 0.55, 0.67 and 1.6m,
Over ocean: spectral AOD at 0.55, 0.67, 0.86 and 1.6m
ngstrm exponent;
aerosol mixture optional
Aerosol algorithm: AATSR-DV (ADV) over land; AATSR-SV (ASV) over ocean
Cloud screening: ADV and ASV have their own cloud screening
Aerosol model: AERONET derived aerosol models (Dubovik, 2002; Levy 2007): variable mixture of fine and coarse mode
Retrieval assumptions: Mie scattering on spherical particles, Lambertian surface reflection, ratio between nadir and forward views independent of wavelength
Retrieval limitations: surface reflectance << 1, no application to the 0.87m channel over land due to the strong reflection by vegetation, different algorithms over land and ocean
Spatial, temporal coverage: 2003-present / global under development
Spatial, temporal resolution: 0.1o x0.1o / 512km swath / 5 days repeat cycle
Operations status: scientific
Validation status: intercomparison with groud-based and MODIS observations
Quality control: major elements
last algorithm version: 0.9/ADV(02/2010)
last validation: 02/2010 (on-going)

 

 

Algorithm description
 
Product format description
Version explanation
 
Validation summary