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Jaross, G, Warner, J (2008). Use of Antarctica for validating reflected solar radiation measured by satellite sensors. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 113(D16), D16S34.

A technique is presented for validating Sun-normalized radiances measured by polar orbiting sensors over Antarctica in the wavelength range 330 -800 nm using model calculations for top of the atmosphere reflectances. An important input to these calculations is a model for the reflective properties of the snow surface, especially its directional nature. Details of this model are presented. Evaluations of the radiance calculations using OMI/Aura, MODIS/Aqua, and MISR/Terra data suggest that the surface representation is the largest source of uncertainty, representing +/- 1% in radiance at solar zenith angles less than 70 degrees. Radiometric evaluations for limited wavelengths of MODIS, TOMS/Earth Probe, and OMI indicate that the first two are accurate to within the +/- 2% uncertainties in the technique. The OMI reflectances are lower than predictions by 2.5% to 8%, the smallest difference being near the nadir view and the largest at far off-nadir view angles. A time series of Antarctic 360 nm radiances measured by OMI from launch until 2007 is consistent with no change in sensor response in excess of 1%.



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