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Numerical simulations of optical properties of Saharan dust aerosols with emphasis on lidar applications

Wiegner, M. and Gasteiger, J. and Kandler, K. and Weinzierl, Bernadett and Rasp, K. and Esselborn, M. and Freudenthaler, V. and Heese, B. and Toledano, C. and Tesche, M. and Althausen, D. (2009) Numerical simulations of optical properties of Saharan dust aerosols with emphasis on lidar applications. Tellus B - Chemical and Physical Meteorology, 61B, pp. 180-194. DOI: 10.1111/j.1600-0889.2008.00381.x.

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Official URL: http://www3.interscience.wiley.com/journal/118533053/home

Abstract

In the framework of the Saharan Mineral Dust Experiment (SAMUM) for the first time the spectral dependence of particle linear depolarization ratios was measured by combining four lidar systems. In this paper these measurements are compared with results from scattering theory based on the T-matrix method. For this purpose, in-situ measurements - size distribution, shape distribution and refractive index - were used as input parameters; particle shape was approximated by spheroids. A sensitivity study showed that lidar related parameters - lidar ratio Sp and linear depolarization ratio δp - are very sensitive to changes of all parameters. The simulated values of the δp are in the range of 20% and 31% and thus in the range of the measurements. The spectral dependence is weak, so that it could not be resolved by the measurements. Calculated lidar ratios based on the measured microphysics and considering equivalent radii up to 7.5 µm show a range of possible values between 29 sr and 50 sr at λ=532 nm. Larger Sp might be possible if the real part of the refractive index is small and the imaginary part is large. A strict validation was however not possible as too many microphysical parameters inuence Sp and δp that could not be measured with the required accuracy.

Document Type:Article
Title:Numerical simulations of optical properties of Saharan dust aerosols with emphasis on lidar applications
Authors:
AuthorsInstitution or Email of Authors
Wiegner, M.LMU München
Gasteiger, J.LMU München
Kandler, K.Johannes Gutenberg Univ. Mainz
Weinzierl, BernadettUNSPECIFIED
Rasp, K.UNSPECIFIED
Esselborn, M.UNSPECIFIED
Freudenthaler, V.LMU München
Heese, B.Institut für Troposphärenforschung, Leipzig
Toledano, C.LMU München
Tesche, M.Institut für Troposphärenforschung, Leipzig
Althausen, D.Institut für Troposphärenforschung, Leipzig
Date:2009
Journal or Publication Title:Tellus B - Chemical and Physical Meteorology
Refereed publication:Yes
In Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:61B
DOI:10.1111/j.1600-0889.2008.00381.x
Page Range:pp. 180-194
Status:Published
Keywords:SAMUM;aerosol;optical properties;numerical simulations;aspherical particles
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W - no assignement
DLR - Research theme (Project):W -- no assignement (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Dr.rer.nat. Bernadett Weinzierl
Deposited On:18 Aug 2008
Last Modified:12 Dec 2013 20:32

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