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Technical Note: Optical properties of desert aerosol with non-spherical mineral particles: data incorporated to OPAC

Koepke, Peter and Gasteiger, Josef and Hess, Michael (2015) Technical Note: Optical properties of desert aerosol with non-spherical mineral particles: data incorporated to OPAC. Atmospheric Chemistry and Physics, 15 (10), pp. 5947-5956. Copernicus Publications. doi: acp-15-5947-2015. ISSN 1680-7316.

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Official URL: http://www.atmos-chem-phys.net/15/5947/2015/acp-15-5947-2015.html


Mineral particles, in general, are not spheres and so the assumption of spherical particles, instead of more realistic shapes, has significant effects on modeled optical properties and therefore on remote-sensing procedures for desert aerosol and the derived radiative forcing. Thus, in a new version of the database OPAC (Optical Properties of Aerosols and Clouds; Hess et al., 1998), the optical properties of the mineral particles are modeled describing the particles as spheroids with size dependent aspect ratio distributions, but with the size distributions and the spectral refractive indices not changed against the previous version of OPAC. The spheroid assumption is known to substantially improve the scattering functions but pays regard to the limited knowledge on particle shapes in an actual case. The relative deviations of the optical properties of non-spherical mineral particles from those of spherical particles are for the phase function in the solar spectral range up to +60% at scattering angles of about 130° and up to −60% in the backscatter region, but less than 2% for the asymmetry parameter. The deviations are generally small in the thermal infrared and for optical properties that are independent of the scattering angle. The improved version of OPAC (4.0) is freely available at www.rascin.net.

Item URL in elib:https://elib.dlr.de/97280/
Document Type:Article
Title:Technical Note: Optical properties of desert aerosol with non-spherical mineral particles: data incorporated to OPAC
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Koepke, PeterLMU MünchenUNSPECIFIED
Gasteiger, JosefLMU, MünchenUNSPECIFIED
Hess, Michaelmichael.hess (at) dlr.deUNSPECIFIED
Date:May 2015
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :acp-15-5947-2015
Page Range:pp. 5947-5956
EditorsEmailEditor's ORCID iD
Pöschl, Ulrichu.poschl@mpic.deUNSPECIFIED
Carslaw, Kenk.s.carslaw@leeds.ac.ukUNSPECIFIED
Koop, Thomasthomas.koop@uni-bielefeld.deUNSPECIFIED
Sander, Rolfrolf.sander@mpic.deUNSPECIFIED
Sturges, William Thomasw.sturges@uea.ac.ukUNSPECIFIED
Publisher:Copernicus Publications
Keywords:Aerosols, Clouds
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Vorhaben Spektrometrische Verfahren und Konzepte der Fernerkundung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Schreier, Dr.rer.nat. Franz
Deposited On:21 Jul 2015 14:03
Last Modified:02 May 2019 14:04

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