TY - JOUR
T1 - Hyperspectral spaceborne imaging of dust-laden flows
T2 - Anatomy of saharan dust storm from the bodélé depression
AU - Chudnovsky, A.
AU - Kostinski, A.
AU - Herrmann, L.
AU - Koren, I.
AU - Nutesku, G.
AU - Ben-Dor, E.
N1 - Funding Information: Authors greatly appreciate Dr. Mounkaila M. important comments. A. Chudnovsky is grateful to the Dept. of Physics of the Michigan Tech for their hospitality and support. Deepest thanks are given to the Head of the Department, Prof. Ravi Pandey and to the secretary Kathy Wollan. A. Chudnovsky is grateful to Prof. Petros Koutrakis from Harvard School of Public Health for his support. The authors also greatly appreciate Mr. Guy Shwartz from Tel-Aviv RS Lab for programming using IDL. This work was supported in part by the US National Science Foundation through ATM05-54670 .
PY - 2011/4/15
Y1 - 2011/4/15
N2 - We study hyperspectral images of the Bodélé Depression in Northern Chad, acquired by the Hyperion sensor onboard EO-1 spacecraft. Relative abundances of four major mineral components are obtained on a pixel-bypixel basis and we report on the comparison of images of a dust storm with the same areas on a calm day. Minerals lifted and suspended particles downwind of a dust source are thus identified. Linear Spectral Unmixing (LSU) decomposition results for the calm condition match those of our field study. LSU calm vs. stormy comparison, based on absorbance features, highlight the spectral contrast. Despite low contrast above bright areas, morphological dissimilarity is evident via the wave and tongue-like features, aligned with the prevailing northeasterly winds. We analyze the longest part of shortwave infra-red (2080-2380 nm) wavelengths where the atmosphere is transparent, optical properties are stable, and absorption features of hydroxyl-bearing minerals, sulfates, and carbonates are pronounced. The results of our spectral analyses reveal that clay minerals may be used as tracers for atmospheric dust monitoring even above bright areas. Such clay minerals include kaolinite, illite-moscovite, and Fe-rich nontronite.
AB - We study hyperspectral images of the Bodélé Depression in Northern Chad, acquired by the Hyperion sensor onboard EO-1 spacecraft. Relative abundances of four major mineral components are obtained on a pixel-bypixel basis and we report on the comparison of images of a dust storm with the same areas on a calm day. Minerals lifted and suspended particles downwind of a dust source are thus identified. Linear Spectral Unmixing (LSU) decomposition results for the calm condition match those of our field study. LSU calm vs. stormy comparison, based on absorbance features, highlight the spectral contrast. Despite low contrast above bright areas, morphological dissimilarity is evident via the wave and tongue-like features, aligned with the prevailing northeasterly winds. We analyze the longest part of shortwave infra-red (2080-2380 nm) wavelengths where the atmosphere is transparent, optical properties are stable, and absorption features of hydroxyl-bearing minerals, sulfates, and carbonates are pronounced. The results of our spectral analyses reveal that clay minerals may be used as tracers for atmospheric dust monitoring even above bright areas. Such clay minerals include kaolinite, illite-moscovite, and Fe-rich nontronite.
KW - Atmospheric dust
KW - Bodele depression
KW - Hyperion satellite
KW - Hyperspectral technology
KW - Mineral dust
UR - http://www.scopus.com/inward/record.url?scp=80555155627&partnerID=8YFLogxK
U2 - 10.1016/j.rse.2010.12.006
DO - 10.1016/j.rse.2010.12.006
M3 - مقالة
SN - 0034-4257
VL - 115
SP - 1013
EP - 1024
JO - Remote Sensing of Environment
JF - Remote Sensing of Environment
IS - 4
ER -