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Mineral dust observed with AERONET Sun photometer, Raman lidar, and in situ instruments during SAMUM 2006: Shape-dependent particle properties

Müller, Detlef and Ansmann, Albert and Freudenthaler, Volker and Esselborn, Michael (2010) Mineral dust observed with AERONET Sun photometer, Raman lidar, and in situ instruments during SAMUM 2006: Shape-dependent particle properties. Journal of Geophysical Research: Atmospheres, 115 (11), D11207. Wiley. DOI: 10.1029/2009JD012523 ISSN 0148-0227

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Abstract

Nearly pure Saharan dust was observed with an Aerosol Robotic Network (AERONET) Sun photometer, several Raman and high spectral resolution lidars, and airborne in situ instruments during the Saharan Mineral Dust Experiment (SAMUM) 2006 in Morocco. In the framework of a case study we present particle shape-dependent dust properties, i.e., backscatter coefficients, extinction-to-backscatter (lidar) ratios, and linear particle depolarization ratios. These parameters can be inferred from AERONET's latest version of the mineral dust retrieval algorithm. The parameters can be measured with multiwavelength Raman/depolarization lidar without critical assumptions on particle shape. Lidar ratios inferred from the AERONET Sun photometer data tend to be larger than lidar ratios measured directly with lidar. Linear dust depolarization ratios were derived for several measurement wavelengths from the data products of the AERONET Sun photometer. The depolarization ratios tend to be smaller than the depolarization ratios measured with lidar. The largest differences exist in the near-ultraviolet wavelength range. Particle axis ratios were determined with scanning electron microscopy. The axis ratio distribution differs significantly from the axis ratio distribution that is assumed in the AERONET retrievals. If the axis ratio distributions measured during SAMUM are used, the reproducibility of the lidar data products improves. The differences may in part be caused by an insufficient understanding of the light-scattering model that is used in the AERONET algorithm. The results of the present study will be used to develop a dust light-scattering model that will serve as the theoretical basis for the inversion of optical data into dust microphysical properties.

Item URL in elib:https://elib.dlr.de/97014/
Document Type:Article
Title:Mineral dust observed with AERONET Sun photometer, Raman lidar, and in situ instruments during SAMUM 2006: Shape-dependent particle properties
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Müller, DetlefIfT, LeipzigUNSPECIFIED
Ansmann, AlbertIfT, LeipzigUNSPECIFIED
Freudenthaler, VolkerLMU, MünchenUNSPECIFIED
Esselborn, MichaelDLR, IPAUNSPECIFIED
Date:2010
Journal or Publication Title:Journal of Geophysical Research: Atmospheres
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:115
DOI :10.1029/2009JD012523
Page Range:D11207
Publisher:Wiley
ISSN:0148-0227
Status:Published
Keywords:airborne sensor; algorithm; backscatter; dust; in situ measurement; lidar; mineral; numerical model; photometer; scanning electron microscopy; ultraviolet radiation; wavelength
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 LIDAR-Forschung und -Entwicklung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Kiemle, Dr.rer.nat. Christoph
Deposited On:08 Jul 2015 10:45
Last Modified:08 Mar 2018 18:32

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