Retrieval of Ice Cloud Properties Using Variable Phase Functions
2009
An enhancement to NASA Langley’s Visible Infrared Solar‐infrared Split‐window Technique (VISST) is developed to identify and account for situations when errors are induced by using smooth ice crystals. The retrieval scheme incorporates new ice cloud phase functions that utilize hexagonal crystals with roughened surfaces. In some situations, cloud optical depths are reduced, hence, cloud height is increased. Cloud effective particle size also changes with the roughened ice crystal models which results in varied effects on the calculation of ice water path. Once validated and expanded, the new approach will be integrated in the CERES MODIS algorithm and real‐time retrievals at Langley.
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