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Optical properties of non-spherical desert dust particles in the terrestrial infrared - An asymptotic approximation approach

Klüser, Lars and Di Biagio, Claudia and Kleiber, Paul D. and Formenti, P. and Grassian, Vicki H. (2016) Optical properties of non-spherical desert dust particles in the terrestrial infrared - An asymptotic approximation approach. Journal of Quantitative Spectroscopy and Radiative Transfer, 178, pp. 209-223. Elsevier. DOI: 10.1016/j.jqsrt.2015.11.020 ISSN 0022-4073

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Optical properties (extinction efficiency, single scattering albedo, asymmetry parameter and scattering phase function) of five different desert dust minerals have been calculated with an asymptotic approximation approach (AAA) for non-spherical particles. The AAA method combines Rayleigh-limit approximations with an asymptotic geometric optics solution in a simple and straightforward formulation. The simulated extinction spectra have been compared with classical Lorenz-Mie calculations as well as with laboratory measurements of dust extinction. This comparison has been done for single minerals and with bulk dust samples collected from desert environments. It is shown that the non-spherical asymptotic approximation improves the spectral extinction pattern, including position of the extinction peaks, compared to the Lorenz-Mie calculations for spherical particles. Squared correlation coefficients from the asymptotic approach range from 0.84 to 0.96 for the mineral components whereas the corresponding numbers for Lorenz-Mie simulations range from 0.54 to 0.85. Moreover the blue shift typically found in Lorenz-Mie results is not present in the AAA simulations. The comparison of spectra simulated with the AAA for different shape assumptions suggests that the differences mainly stem from the assumption of the particle shape and not from the formulation of the method itself. It has been shown that the choice of particle shape strongly impacts the quality of the simulations. Additionally, the comparison of simulated extinction spectra with bulk dust measurements indicates that within airborne dust the composition may be inhomogeneous over the range of dust particle sizes, making the calculation of reliable radiative properties of desert dust even more complex.

Item URL in elib:https://elib.dlr.de/100848/
Document Type:Article
Title:Optical properties of non-spherical desert dust particles in the terrestrial infrared - An asymptotic approximation approach
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Klüser, Larslars.klueser (at) dlr.deUNSPECIFIED
Di Biagio, ClaudiaUniv. Paris Est Creteil, Créteil, FUNSPECIFIED
Kleiber, Paul D.University of IowaUNSPECIFIED
Formenti, P.Univ. Paris Est Creteil, Créteil, FUNSPECIFIED
Grassian, Vicki H.University of IowaUNSPECIFIED
Journal or Publication Title:Journal of Quantitative Spectroscopy and Radiative Transfer
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.jqsrt.2015.11.020
Page Range:pp. 209-223
Keywords:desert dust; optical properties; infrared; non-spherical particles
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center > Atmosphere
Deposited By: Klüser, Dr. Lars
Deposited On:16 Dec 2015 13:16
Last Modified:06 Sep 2019 15:28

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