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Optical properties of aerosol mixtures derived from sun-sky radiometry during SAMUM-2

Toledano, C. and Wiegner, M. and Groß, S. and Freudenthaler, V. and Gasteiger, J. and Müller, D. and Müller, T. and Schladitz, A. and Weinzierl, B. and Torres, B. and O’Neill, N.T. (2011) Optical properties of aerosol mixtures derived from sun-sky radiometry during SAMUM-2. Tellus B - Chemical and Physical Meteorology, 63B, pp. 635-648. DOI: 10.1111/j.1600-0889.2011.00573.x.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1600-0889.2011.00573.x/pdf

Abstract

The SAMUM-2 experiment took place in the CapeVerde islands in Januaryâ��February 2008. The colocated ground-based and airborne instruments allow the study of desert dust optical and microphysical properties in a closure experiment. The Meteorological Institute of the University of Munich deployed one sun-sky photometer and two tropospheric lidar systems. A travelling AERONET-Cimel sun-sky radiometer was also deployed. During the measurement period the aerosol scenario over Cape Verde mostly consisted of a dust layer below 2 km and a smoke-dust layer above 2â��4 km a.s.l. The Saharan dust arrived at the site from the NE, whereas the smoke originated in the African equatorial region. This paper describes the main results of the Sun photometer observations, supported by lidar information. An analysis of the variations in the aerosol optical depth (AOD) in the range 340â��1550 nm, the ��ngstr�¨om exponent, volume size distributions and single scattering albedo is presented. The aerosol mixtures are analysed by means of the fine mode fraction of the AOD provided by the sun-sky inversion data and the Spectral Deconvolution Algorithm. The mean AOD (500 nm) was 0.31, with associated low ��ngstr�¶m exponent of 0.46. Several types of events were detected within the data set, with prevalence of dust or mixtures as characterized by the ��ngstr�¶m exponents of extinction and absorption and the fine mode fraction. Aerosol properties derived from sunphotometry were compared to in situ measurements of size distribution, effective radius and single scattering albedo.

Document Type:Article
Title:Optical properties of aerosol mixtures derived from sun-sky radiometry during SAMUM-2
Authors:
AuthorsInstitution or Email of Authors
Toledano, C.LMU Munich
Wiegner, M.LMU Munich
Groß, S.LMU Munich
Freudenthaler, V.LMU Munich
Gasteiger, J.LMU Munich
Müller, D.ift, Leipzig
Müller, T.ift, Leipzig
Schladitz, A.ift, Leipzig
Weinzierl, B.DLR
Torres, B.Valladolid Univ., Valladolid, E
O’Neill, N.T.Univ. de Sherbrooke, Sherbrooke, CND
Date:2011
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:63B
DOI:10.1111/j.1600-0889.2011.00573.x
Page Range:pp. 635-648
Status:Published
Keywords:Saharan Mineral Dust Experiment SAMUM
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:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Jana Freund
Deposited On:26 Jan 2012 15:29
Last Modified:12 Dec 2013 21:35

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