Atmospheric Measurement Techniques www.atmos-meas-tech.net 1867-1381 1867-8548 2 2 2009 10.5194/amt-2-679-2009 http://www.atmos-meas-tech.net/2/679/2009/ http://www.atmos-meas-tech.net/2/679/2009/amt-2-679-2009.html http://www.atmos-meas-tech.net/2/679/2009/amt-2-679-2009.pdf 679 701 2009-11-06 The GRAPE aerosol retrieval algorithm G. E. Thomas gthomas@atm.ox.ac.uk C. A. Poulsen A. M. Sayer S. H. Marsh S. M. Dean E. Carboni R. Siddans R. G. Grainger B. N. Lawrence Atmospheric, Oceanic and Planetary Physics, University of Oxford, Oxford, UK Space Science and Technology Department, Rutherford Appleton Laboratory, Chilton, Didcot, UK present address: Department of Medical Physics and Bioengineering, Christchurch Hospital, New Zealand present address: National Institute of Water and Atmospheric Research, Wellington, New Zealand The aerosol component of the Oxford-Rutherford Aerosol and Cloud (ORAC) combined cloud and aerosol retrieval scheme is described and the theoretical performance of the algorithm is analysed. ORAC is an optimal estimation retrieval scheme for deriving cloud and aerosol properties from measurements made by imaging satellite radiometers and, when applied to cloud free radiances, provides estimates of aerosol optical depth at a wavelength of 550 nm, aerosol effective radius and surface reflectance at 550 nm. 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