Dust fallout characteristics within global dust storm major trajectories |
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| Authors: | Ali M Al-Dousari Jasem Al-Awadhi Modi Ahmed |
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| Institution: | 1. Coastal and Air Pollution Department, Kuwait Institute for Scientific Research, P.O. Box 24885, Safat, Kuwait City, 13109, Kuwait
2. Earth and Environmental Sciences Department, Faculty of Science, Kuwait University, Kuwait City, Kuwait
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| Abstract: | Satellite images from 2000 to 2010 were used to identify major dust trajectories within seven major deserts in the world. The fallen dust from these trajectories were collected and analyzed. The fallen dust rates tend to be lower downwind. The average samples of the world's fallen dust are negatively skewed trimodal with dominancy of silt size fractions (61 %). Most of the fallen dust within major dust trajectories is fining downwind. The fallen dust from the eastern zones (Taklimakan, Gobi, and Australian deserts) are characterized by higher percentages of feldspars and clay minerals, low carbonate content, and grain surface area in comparison to the Western zones (Sahara and Arabian deserts). The Western Sahara Desert dust is differentiated by the highest depositional rates and average quartz percentage (66 %). The dust samples in this zone contain low carbonates and grain surface area compared to dust from the Eastern Sahara Desert. The dust samples within Northern Arabia and Ethiopian-south Arabia zones show the highest average of carbonate amounts and grain surface area. |
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