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

Jamie R. Banks, Helen E. Brindley, Georgiy L. Stenchikov, Kerstin Schepanski

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

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.
Original languageEnglish (US)
Pages (from-to)3987-4003
Number of pages17
JournalAtmospheric Chemistry and Physics
Volume17
Issue number6
DOIs
StatePublished - Mar 24 2017

Fingerprint

Dive into the research topics of 'Satellite retrievals of dust aerosol over the Red Sea and the Persian Gulf (2005–2015)'. Together they form a unique fingerprint.

Cite this