Comparison of PARASOL Observations with Polarized Reflectances Simulated Using Different Ice Habit Mixtures

• DOI: 10.1175/jamc-d-12-097.1
• Publication Date: 2012-08-13T19:15:58Z
• Authors: Benjamin H. Cole; Ping Yang; Bryan A. Baum; Jerome Riedi; Laurent C.-Labonnote; Francois Thieuleux; Steven Platnick
• Keywords: Reflection; Ice cloud; Albedo (alchemy); Crystal habit

Abstract Insufficient knowledge of the habit distribution and degree surface roughness ice crystals within clouds is a source uncertainty in forward light scattering radiative transfer simulations used downstream applications. The Moderate Resolution Imaging Spectroradiometer (MODIS) collection-5 microphysical model presumes mixture various crystal shapes with smooth facets, except for compact aggregate columns which severely rough condition assumed. When compared Polarization Anisotropy Reflectances Atmospheric Sciences coupled Observations from Lidar ( PARASOL ) polarized reflection data, reflectance using particles show poor fit to measurements, whereas very rough-faceted provide an improved reflectance. In this study new based on nine different habits roughened facets developed. Simulated calculated vector adding–doubling model, closely agree observed by . general also tested spherical albedo differences analysis, roughening found improve consistency multiangular observations. These results are consistent previous studies that have data. It suggested incorporating ensemble surfaces would potentially be adequate choice global cloud retrievals.