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" Infrared Transmission and Ozone Decomposition Characteristics of Selected North African Mineral Dusts "
Almedwah, Mariam M.
Vernon, Morris R.
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Latin Dissertation
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English
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| Record Number
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1105134
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TLpq2299173107
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| Main Entry
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Almedwah, Mariam M.
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Vernon, Morris R.
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| Title & Author
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Infrared Transmission and Ozone Decomposition Characteristics of Selected North African Mineral Dusts\ Almedwah, Mariam M.Vernon, Morris R.
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| College
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Howard University
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| Date
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2019
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| student score
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2019
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| Degree
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M.S.
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| Page No
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92
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| Abstract
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North Africa is one of the largest dust source regions in the world, emitting tons of dust particles that are annually transported to the atmosphere by strong winds. These dust particles may be strongly influencing the balance and the chemistry of the atmosphere and thereby has the potential to alter the regional climate system. The primary objectives of this study were to understand the infrared transmission and ozone decomposition characteristics of the selected North African mineral dust, as well as clarify the chemical composition of the regional dust samples. Dust samples were collected from different locations in North Africa: Sudan, Morocco, and Mali. Attenuated Total Reflectance (ATR) Fourier transform infrared (FTIR) spectroscopy, was used to investigate the differences between the dust samples as a function of temperature and size distribution. Dust samples were exposed to different concentrations of ozone and then were examined for changes in the surface. Size distribution of dust particles had remarkable effects on the IR spectra recorded. Coarse dust may have different climate effect than fine dust because of the differences in their interaction with longwave radiation. Quartz, kaolinite, montmorillonite, illite, calcite, albite, and palygorskite were found in all dust samples. Vermiculite mineral was observed only in Mali dust. Mali mineral dust may have greater chemical effects due to absorbed frequency change. Sudan mineral dust may have greater climate effects due to enhanced interaction with long-wave radiation
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Aeronomy
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Atmospheric sciences
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Environmental science
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North African studies
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Public health
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