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Aerosol remote sensing using AATSR: The dual-view ORAC retrieval scheme

Andrew Sayer(1), Gareth Thomas(1), Don Grainger(1) and Christopher Mutlow(2)

(1) University of Oxford, Clarendon Laboratory, Oxford OX1 3PU, United Kingdom
(2) Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot OX11 0QX, United Kingdom


The differing path lengths of AATSR’s forward and nadir views can be used to separate the contributions from aerosol scattering and surface reflectance in the observed top-of-atmosphere (TOA) radiance. The nadir-view Oxford-RAL retrieval of Aerosols and Clouds (ORAC) scheme has been extended to take advantage of the dual-view capabilities AATSR offers. The new algorithm uses optimal estimation to simultaneously retrieve aerosol optical depth at 550 nm, aerosol effective radius and the white-sky surface albedo at AATSR visible channel wavelengths. Retrieval results for the month of September 2004, with a comparison of optical depth against AERONET and other satellite measurements, are also presented.


Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry