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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 Kandler, Konrad and Toledano, C. and Hiebsch, A. and Gasteiger, J. and Esselborn, Michael and Tesche, Matthias and Heese, Birgit and Althausen, Dietrich and Weinzierl, Bernadett and Petzold, Andreas and von Hoyningen‐Huene, W. (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, 115 (D11207), pp. 1-11. DOI: 10.1029/2009JD012523.

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Official URL: http://www.agu.org/journals/jd/jd1011/2009JD012523/2009JD012523.pdf

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.

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 Authors
Müller, DetlefGwangju Inst. of Science and Technology, Gwangju, South Korea
Ansmann, AlbertIfT, Leipzig
Freudenthaler, VolkerLMU, München
Kandler, KonradTU Darmstadt, Darmstadt
Toledano, C.LMU, München
Hiebsch, A.IfT, Leipzig
Gasteiger, J.LMU, München
Esselborn, MichaelDLR
Tesche, MatthiasIfT, Leipzig
Heese, BirgitIfT, Leipzig
Althausen, DietrichIfT, Leipzig
Weinzierl, BernadettDLR
Petzold, AndreasDLR
von Hoyningen‐Huene, W.Univ. Bremen, Bremen
Date:2010
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:115
DOI:10.1029/2009JD012523
Page Range:pp. 1-11
Status:Published
Keywords:desert dust, remote sensing, dust size distribution, AERONET
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Jana Freund
Deposited On:16 Aug 2010 17:11
Last Modified:23 Jan 2014 11:36

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