KAUST DepartmentEarth Science and Engineering Program
Physical Science and Engineering (PSE) Division
Permanent link to this recordhttp://hdl.handle.net/10754/668772
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AbstractAbstract. The inter-annual variability of dust aerosol presence over the Red Sea is analysed, with respect to the summer-time latitudinal gradient in dust loading, which is at a maximum in the far south of the Red Sea and at a minimum in the far north. Two satellite aerosol optical depth (AOD) products from the Spinning Enhanced Visible and Infrared Imager (SEVIRI) and the MODerate resolution Imaging Spectroradiometer (MODIS) instruments are used to quantify this loading over the region. Over an eleven-year period from 2005–2015 the July mean SEVIRI AODs at 630 nm vary between 0.48 and 1.45 in the southern half of the Sea, while in the north this varies between 0.22 and 0.66. Validating the AOD retrievals using ship-based measurements from 2010–2015, both instrument retrievals are highly correlated with the surface measurements, with biases of +0.02 for SEVIRI and +0.03 for MODIS. However, inter-retrieval biases are observed to occur at higher dust loadings, with pronounced positive MODIS-SEVIRI AOD biases at AODs greater than ~1. Co-located MISR data indicate broadly equal but opposite biases by the two retrievals when the MISR AOD > 1, +0.12 for MODIS and −0.10 for SEVIRI as compared with MISR, indicating substantial and systematic differences between the retrievals over the Red Sea at high dust loadings.
CitationBanks, J. R., Brindley, H. E., Stenchikov, G., & Schepanski, K. (2016). Satellite retrievals of dust aerosol over the Red Sea, 2005–2015. doi:10.5194/acp-2016-871
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