Physics
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3101102h&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 1, CiteID L01102
Physics
10
Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Instruments And Techniques, Global Change: Remote Sensing
Scientific paper
Bi-directional reflectances of marine liquid water clouds, as measured by the Multiangle Imaging SpectroRadiometer (MISR), are compared with plane-parallel radiative transfer model calculations. We define an angular consistency test that requires measured and modeled radiances to agree within +/-5% for all chosen view angles for the observations to be classified as plane-parallel. When all nine MISR angles are used at the full 275 m resolution, 1 in 6 pixels (17%) pass the test. There is a slight dependence on effective radius Re, with Re = 8 μm resulting in the highest pass rate. As the resolution is degraded, clouds appear more plane-parallel, and the passing rate increases to 38% at the coarsest 17.6 km scale. The passing rate quickly decreases as the number of angles used in the angular test increases. Requiring a match at only the nadir and two near-nadir angles immediately eliminates half of the full resolution pixels.
Davies Roger
Horváth Ákos
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