Hyperspectral spaceborne imaging of dust-laden flows: Anatomy of Saharan dust storm from the Bodélé Depression
نویسندگان
چکیده
a r t i c l e i n f o 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-by-pixel 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.
منابع مشابه
Monitoring of Dust Storm in the Midwest of Iran Case Study: Dust Storm June 16-19, 2015
This research was conducted to identify the dust storms in the Midwest of Iran from June 16 to 19, 2015. To investigate the synoptic conditions of the causes of this phenomenon, the ECMWF has an array of 0.125 degrees, including geopotential, omega, and sea level pressure, orbital and meridian components of the wind, specific humidity Soil moisture was applied to a depth of 10 cm. Similarly, fo...
متن کاملTransport of Saharan dust from the Bodélé Depression to the Amazon Basin
Transport of Saharan dust from the Bodélé Depression to the Amazon Basin: a case study Y. Ben-Ami, I. Koren, Y. Rudich, P. Artaxo, S. T. Martin, and M. O. Andreae Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot, Israel Institute of Physics, University of São Paulo, São Paulo, Brazil School of Engineering and Applied Sciences and Department of Ear...
متن کاملThe effect of simulated dust storm on wood development and leaf stomata in Quercus brantii L
Dust storms are increasingly threatening the forest ecosystem in Western Iran. Due to its coverage of vast area of Zagros forest, the Quercus brantii is at the front line of the attack. Most tree deaths in this forest are from this species. This study aims to investigate the effect of simulated dust on wood development and leaf stomata from seedlings of Persian oak. The oak seedlings were...
متن کاملDust Storm Frequency in Connection with Climatic Change in the Arid Region of Iran
Dust storms in arid and semi-arid regions have harmful impacts on the environment, the economy, and the health of local and global communities. In this study, the frequency of annual dust events in twenty-five stations and five climatic variables including rainfall, maximum annual wind speed, average annual wind speed, maximum annual temperature, and average annual temperature in arid regions o...
متن کاملAnalysis and tracking dust storms routes entering to east of Iran using the particle diffusion HYSPLIT model
Extended abstract 1- Introduction A dust storm is one of the biggest serious environmental problems in the arid and semi-arid regions of the world, causing irreparable damages to farms, facilities, roads, traffic and transportation every year and respitory problems by contaminating the air. Due to the geographic location of Iran which is in the arid and semi-arid belt of the world, the count...
متن کامل