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[ACC20-05] Characteristics of cryoconite on the Lewis Glacier in Mt.Kenya Africa
Keywords:Cryoconite, East Africa
Microscopy of the cryoconite revealed that its characteristics were distinctive between the lower and upper areas of the glacier. Cryoconite consisted of mineral particles and filamentous cyanobacteria, but cryoconite granules were formed only in the lower site. The amounts of organic matter in cryoconite were more abundant in the lower site than in the upper site. Optical analyses of cryoconite showed that spectral reflectance of cryoconite in the lower site was low and constant in the visible and near-infrared wavelength range while that in the upper site was relatively higher. The difference is probably due to effect of organic matter, which can darken cryoconite. The reflectance of mineral particles in cryoconite was similar to that of cryoconite in the upper part, indicating less effect of organic matter on the reflectance. The factors causing the different characteristics of cryoconite between upper and lower sites are uncertain, but they may affect surface albedo and melting of the glacier surface.