27 December 1995 Cirrus properties using ATSR and the potential of ATSR-2/AATSR
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Abstract
We present several case studies of thermal observations of cirrus using the Along Track Scanning Radiometer (ATSR) nadir and 55° forward view aboard ERS-1 (Earth Resources Satellite). We examine the potential of ATSR for retrieval of thermal optical depth at. 3.7, 10.8 and 11.9 tm and cloud temperature at 11.9 jm under absorption and scattering approximations. Ice crystal size is estimated by applying Mie theory under the assumption of spheres and Anomalous Diffraction theory (ADT), assuming hexagonal columns, plates, rosettes and planar polycrystals. The estimated particle sizes are compared using the two theories under assumed conditions of absorption and scattering. The potential use of the dual look capability of ATSR-2, with its additional visible channels at 0.55, 0.66, and 0.865 m, and advanced ATSR (AATSR) for crystal shape and size determination at 0.55 and 1.6 jm is demonstrated. For semi-transparent cirrus the difference in backscattered solar radiation at nadir and forward views is sensitive to ice crystal habit which is demonstrated using representative ice crystal phase functions (columns and polycrystals). The sensitivity to ice crystal size is examined using the forward view at 0.5 and 1.6 ,am for columns and polycrystals.
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Anthony J. Baran, S. J. Brown, David L. Mitchell, John S. Foot, A. Macke, "Cirrus properties using ATSR and the potential of ATSR-2/AATSR", Proc. SPIE 2578, Passive Infrared Remote Sensing of Clouds and the Atmosphere III, (27 December 1995); doi: 10.1117/12.228929; https://doi.org/10.1117/12.228929
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KEYWORDS
Crystals

Clouds

Absorption

Mie scattering

Particles

Optical spheres

Scattering

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