Comparison with MODIS All ice retrieval algorithms, no matter what instruments they use, are sensitive to assumed ice particle shape In the VarCloud-BR version, we try to replicate the MODIS assumption that particles are largely bullet rosettes Leads to reasonable agreement in mean optical depth, Significant scatter is likely due to 3D radiative transfer effects in the MODIS retrievals Our favoured assumption, oblate aggregates (VarCloud- OA) leads to poorer agreement due to the inconsistency with the MODIS assumptions Stein et al.
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