Spectral absorption coefficients and imaginary parts of refractive indices of Saharan dust during SAMUM-1

dc.bibliographicCitation.firstPage79
dc.bibliographicCitation.issue1eng
dc.bibliographicCitation.journalTitleTellus B: Chemical and Physical Meteorologyeng
dc.bibliographicCitation.lastPage95
dc.bibliographicCitation.volume61
dc.contributor.authorMüller, T.
dc.contributor.authorSchladitz, A.
dc.contributor.authorMassling, A.
dc.contributor.authorKaaden, N.
dc.contributor.authorKandler, K.
dc.contributor.authorWiedensohler, A.
dc.date.accessioned2018-02-06T16:38:27Z
dc.date.available2019-06-26T17:17:15Z
dc.date.issued2017
dc.description.abstractDuring the SAMUM-1 experiment, absorption coefficients and imaginary parts of refractive indices of mineral dust particles were investigated in southern Morocco. Main absorbing constituents of airborne samples were identified to be iron oxide and soot. Spectral absorption coefficients were measured using a spectral optical absorption photometer (SOAP) in the wavelength range from 300 to 800 nm with a resolution of 50 nm. A new method that accounts for a loading-dependent correction of fibre filter based absorption photometers, was developed. The imaginary part of the refractive index was determined using Mie calculations from 350 to 800 nm. The spectral absorption coefficient allowed a separation between dust and soot absorption. A correlation analysis showed that the dust absorption coefficient is correlated (R2 up to 0.55) with the particle number concentration for particle diameters larger than 0.5 μm, whereas the coefficient of determination R2 for smaller particles is below 0.1. Refractive indices were derived for both the total aerosol and a dust aerosol that was corrected for soot absorption. Average imaginary parts of refractive indices of the entire aerosol are 7.4 × 10−3, 3.4 × 10−3 and 2.0 × 10−3 at wavelengths of 450, 550 and 650 nm. After a correction for the soot absorption, imaginary parts of refractive indices are 5.1 × 10−3, 1.6 × 10−3 and 4.5 × 10−4.eng
dc.description.versionpublishedVersioneng
dc.formatapplication/pdf
dc.identifier.urihttps://doi.org/10.34657/1301
dc.identifier.urihttps://oa.tib.eu/renate/handle/123456789/343
dc.language.isoengeng
dc.publisherMilton Park : Taylor & Franciseng
dc.relation.doihttps://doi.org/10.1111/j.1600-0889.2008.00399.x
dc.rights.licenseCC BY 4.0 Unportedeng
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/eng
dc.subject.ddc550eng
dc.subject.otherabsorption coefficienteng
dc.subject.otheraerosol propertyeng
dc.subject.othercorrelationeng
dc.subject.otherdusteng
dc.subject.otheriron oxideeng
dc.subject.otherparticle sizeeng
dc.subject.otherphotometereng
dc.subject.otherrefractive indexeng
dc.subject.othersooteng
dc.subject.otherspectral analysiseng
dc.subject.otherwavelengtheng
dc.titleSpectral absorption coefficients and imaginary parts of refractive indices of Saharan dust during SAMUM-1eng
dc.typeArticleeng
dc.typeTexteng
tib.accessRightsopenAccesseng
wgl.contributorTROPOSeng
wgl.subjectGeowissenschafteneng
wgl.typeZeitschriftenartikeleng
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