A temperature-dependent hexagonal ice aggregate far-infrared optical property dataset

Single-scattering properties of severely surface-roughened 8-piece hexagonal column aggregate ice particles in the far infrared (far-IR) wavelength region between 15 and 100 \mum. This particle shape is included in the database of Yang et al. (2013) and adopted in the Moderate Resolution Imaging Spectroradiometer (MODIS) Collection 6 cloud retrieval algorithm. The Invariant Imbedding T‐matrix Method (IITM) and the Improved Geometric Optics Method (IGOM) are used to perform the computation. Let x = 2 * pi * D / lambda, where D is the maximum dimension and lambda is the wavelength. IITM is used when x < 50; IGOM is used when x >= 50. Ice refractive index data are taken from the compilation of Wang et al. (2024).