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    Study of Arabian Red Sea coastal soils as potential mineral dust sources

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    Type
    Article
    Authors
    Prakash, P. Jish
    Stenchikov, Georgiy L. cc
    Tao, Weichun cc
    Yapici, Tahir
    Warsama, Bashir H.
    Engelbrecht, Johann cc
    KAUST Department
    Earth Science and Engineering Program
    Inorganics
    Physical Science and Engineering (PSE) Division
    Date
    2016-03-23
    Permanent link to this record
    http://hdl.handle.net/10754/619759
    
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    Abstract
    Both Moderate Resolution Imaging Spectroradiometer (MODIS) and Spinning Enhanced Visible and InfraRed Imager (SEVIRI) satellite observations suggest that the narrow heterogeneous Red Sea coastal region is a frequent source of airborne dust that, because of its proximity, directly affects the Red Sea and coastal urban centers. The potential of soils to be suspended as airborne mineral dust depends largely on soil texture, moisture content, and particle size distributions. Airborne dust inevitably carries the mineralogical and chemical signature of a parent soil. The existing soil databases are too coarse to resolve the small but important coastal region. The purpose of this study is to better characterize the mineralogical, chemical and physical properties of soils from the Red Sea Arabian coastal plane, which in turn will help to improve assessment of dust effect on the Red Sea and land environmental systems and urban centers. Thirteen surface soils from the hot-spot areas of wind-blown mineral dust along the Red Sea coastal plain were sampled for analysis. Analytical methods included Optical Microscopy, X-ray diffraction (XRD), Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES), Ion Chromatography (IC), Scanning Electron Microscopy (SEM), and Laser Particle Size Analysis (LPSA). We found that the Red Sea coastal soils contain major components of quartz and feldspar, as well as lesser but variable amounts of amphibole, pyroxene, carbonate, clays, and micas, with traces of gypsum, halite, chlorite, epidote and oxides. The wide range of minerals in the soil samples was ascribed to the variety of igneous and metamorphic provenance rocks of the Arabian Shield forming the escarpment to the east of the Red Sea coastal plain. The analysis revealed that the samples contain compounds of nitrogen, phosphorus and iron that are essential nutrients to marine life. The analytical results from this study will provide a valuable input into dust emission models used in climate, marine ecology, and air-quality studies.
    Citation
    Study of Arabian Red Sea coastal soils as potential mineral dust sources 2016:1 Atmospheric Chemistry and Physics Discussions
    Sponsors
    This research, including the chemical and mineralogical analysis is supported by internal funding from the King Abdullah University of Science and Technology (KAUST). For chemical analyses, this research used the resources of the KAUST core lab. We acknowledge the contribution from the collaborating laboratories of the RJ Lee Group and Desert Research Institute.
    Publisher
    Copernicus GmbH
    Journal
    Atmospheric Chemistry and Physics Discussions
    DOI
    10.5194/acp-2016-113
    Additional Links
    http://www.atmos-chem-phys-discuss.net/acp-2016-113/
    ae974a485f413a2113503eed53cd6c53
    10.5194/acp-2016-113
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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