Hyperspectral spaceborne imaging of dust-laden flows: Anatomy of Saharan dust storm from the Bodélé Depression

摘要: Abstract We study hyperspectral images of the Bodele Depression in Northern Chad, acquired by Hyperion sensor onboard EO-1 spacecraft. Relative abundances four major mineral components are obtained on a pixel-by-pixel basis and we report comparison dust storm with same areas calm day. Minerals lifted suspended particles downwind source thus identified. Linear Spectral Unmixing (LSU) decomposition results for condition match those our field study. LSU vs. stormy comparison, based absorbance features, highlight spectral contrast. Despite low contrast above bright areas, morphological dissimilarity is evident via wave tongue-like aligned prevailing northeasterly winds. analyze longest part shortwave infra-red (2080–2380 nm) wavelengths where atmosphere transparent, optical properties stable, absorption features hydroxyl-bearing minerals, sulfates, carbonates pronounced. The analyses reveal that clay minerals may be used as tracers atmospheric monitoring even areas. Such include kaolinite, illite-moscovite, Fe-rich nontronite.