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    Satellite retrievals of dust aerosol over the Red Sea and the Persian Gulf (2005–2015)

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    Type
    Article
    Authors
    Banks, Jamie R.
    Brindley, Helen E.
    Stenchikov, Georgiy L. cc
    Schepanski, Kerstin
    KAUST Department
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    CRG-1-2012-STE- IMP
    Date
    2017-03-24
    Permanent link to this record
    http://hdl.handle.net/10754/625230
    
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    Abstract
    The inter-annual variability of the dust aerosol presence over the Red Sea and the Persian Gulf is analysed over the period 2005-2015. Particular attention is paid to the variation in loading across the Red Sea, which has previously been shown to have a strong, seasonally dependent latitudinal gradient. Over the 11 years considered, the July mean 630 nm aerosol optical depth (AOD) derived from the Spinning Enhanced Visible and InfraRed Imager (SEVIRI) varies between 0.48 and 1.45 in the southern half of the Red Sea. In the north, the equivalent variation is between 0.22 and 0.66. The temporal and spatial pattern of variability captured by SEVIRI is also seen in AOD retrievals from the MODerate Imaging Spectroradiometer (MODIS), but there is a systematic offset between the two records. Comparisons of both sets of retrievals with ship-and land-based AERONET measurements show a high degree of correlation with biases of < 0.08. However, these comparisons typically only sample relatively low aerosol loadings. When both records are stratified by AOD retrievals from the Multi-angle Imaging SpectroRadiometer (MISR), opposing behaviour is revealed at high MISR AODs (> 1), with offsets of C 0.19 for MODIS and 0.06 for SEVIRI. Similar behaviour is also seen over the Persian Gulf. Analysis of the scattering angles at which retrievals from the SEVIRI and MODIS measurements are typically performed in these regions suggests that assumptions concerning particle sphericity may be responsible for the differences seen.
    Citation
    Banks JR, Brindley HE, Stenchikov G, Schepanski K (2017) Satellite retrievals of dust aerosol over the Red Sea and the Persian Gulf (2005–2015). Atmospheric Chemistry and Physics 17: 3987–4003. Available: http://dx.doi.org/10.5194/acp-17-3987-2017.
    Sponsors
    Jamie Banks and Kerstin Schepanski acknowledge funding through the Leibniz Association for the project
    Publisher
    Copernicus GmbH
    Journal
    Atmospheric Chemistry and Physics
    DOI
    10.5194/acp-17-3987-2017
    Additional Links
    http://www.atmos-chem-phys.net/17/3987/2017/
    ae974a485f413a2113503eed53cd6c53
    10.5194/acp-17-3987-2017
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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