Journal ArticleDOI
Spectral aerosol optical depth characterization of desert dust during SAMUM 2006
Carlos Toledano,Matthias Wiegner,Markus Garhammer,Meinhard Seefeldner,Josef Gasteiger,Detlef Müller,Peter Koepke +6 more
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TLDR
In this paper, the spectral features of the AOD under dusty conditions are discussed, and the Optical Properties of Aerosols and Clouds (OPAC) model is used to perform a set of simulations with different aerosol mixtures.Abstract:
The aerosol optical depth (AOD) in the range 340–1550 nm was monitored at Ouarzazate (Morocco) during the Saharan Mineral Dust Experiment (SAMUM) experiment in May–June 2006. Two different sun photometers were used for this purpose. The mean AOD at 500 nm was 0.28, with a maximum of 0.83, and the mean Angstrom exponent (AE) was 0.35. The aerosol content over the site changed alternatively from very low turbidity, associated to Atlantic air masses, to moderate dust load, associated to air masses arriving in the site from Algeria, Tunisia and Libya. The dusty conditions were predominant in the measurement period (78% of data), with AOD (500 nm) above 0.15 and AE below 0.4. The spectral features of the AOD under dusty conditions are discussed. Air mass back trajectory analysis is carried out to investigate the origin and height patterns of the dust loaded air masses. The advection of dust occurred mainly at atmospheric heights below 3000 m, where east flow is the predominant. At the 5000 m level, the air masses originate mainly over the Atlantic Ocean. Finally the Optical Properties of Aerosols and Clouds (OPAC) model is used to perform a set of simulations with different aerosol mixtures to illustrate the measured AOD and AE values under varying dust concentrations, and a brief comparison with other measurement sites is presented. DOI: 10.1111/j.1600-0889.2008.00382.xread more
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Depolarization ratio profiling at several wavelengths in pure Saharan dust during SAMUM 2006.
Volker Freudenthaler,Michael Esselborn,Matthias Wiegner,Birgit Heese,Matthias Tesche,Albert Ansmann,Detlef Müller,Dietrich Althausen,Martin Wirth,Andreas Fix,Gerhard Ehret,Peter Knippertz,Carlos Toledano,Josef Gasteiger,Markus Garhammer,Meinhard Seefeldner +15 more
TL;DR: In this paper, the vertical profiles of the linear particle depolarization ratio of pure dust clouds were measured during the Saharan Mineral Dust Experiment (SAMUM) at Ouarzazate, Morocco, close to source regions in May-June 2006, with four lidar systems at four wavelengths (355, 532, 710 and 1064 nm).
Journal ArticleDOI
Vertically resolved separation of dust and smoke over Cape Verde using multiwavelength Raman and polarization lidars during Saharan Mineral Dust Experiment 2008
Matthias Tesche,Albert Ansmann,Detlef Müller,Detlef Müller,Dietrich Althausen,Ronny Engelmann,Volker Freudenthaler,Silke Groß +7 more
TL;DR: In this paper, a case study of the Saharan Mineral Dust Experiment (SAMUM) was presented to discuss the potential of the technique and compared with column-integrated products obtained with Aerosol Robotic Network Sun photometer.
Journal ArticleDOI
Characterization of Saharan dust, marine aerosols and mixtures of biomass-burning aerosols and dust by means of multi-wavelength depolarization and Raman lidar measurements during SAMUM 2
Silke Groß,Matthias Tesche,Volker Freudenthaler,Carlos Toledano,Carlos Toledano,Matthias Wiegner,Albert Ansmann,Dietrich Althausen,Meinhard Seefeldner +8 more
TL;DR: In this paper, the particle linear depolarization ratio of Saharan dust, marine aerosols and mixtures of biomass-burning aerosols from southern West Africa and Saharan Dust was determined at three wavelengths with three lidar systems during the SAharan Mineral dUst experiMent 2 at the airport of Praia, Cape Verde, between 22 January and 9 February 2008.
Journal ArticleDOI
Saharan Mineral Dust Experiments SAMUM-1 and SAMUM-2 : what have we learned?
Albert Ansmann,Andreas Petzold,Konrad Kandler,Ina Tegen,Manfred Wendisch,Detlef Müller,Detlef Müller,Bernadett Weinzierl,Thomas Müller,Jost Heintzenberg +9 more
TL;DR: The Saharan Mineral Dust Experiment (SAMUM) project as discussed by the authors has been used to study the impact of Saharan dust on radiative transfer and the feedback of radiative effects upon dust emission and aerosol transport.
Journal ArticleDOI
Vertical profiling of Saharan dust with Raman lidars and airborne HSRL in southern Morocco during SAMUM
Matthias Tesche,Albert Ansmann,Detlef Müller,Dietrich Althausen,Ina Mattis,Birgit Heese,Volker Freudenthaler,Matthias Wiegner,Michael Esselborn,Gianluca Pisani,Peter Knippertz +10 more
TL;DR: In this paper, three ground-based Raman lidars and an airborne high-spectral-resolution lidar were operated during SAMUM 2006 in southern Morocco to measure height profiles of the volume extinction coefficient, the extinction-to-backscatter ratio and the depolarization ratio of dust particles in the Saharan dust layer at several wavelengths.
References
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Environmental characterization of global sources of atmospheric soil dust identified with the nimbus 7 total ozone mapping spectrometer (toms) absorbing aerosol product
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Oleg Dubovik,Brent N. Holben,Thomas F. Eck,Thomas F. Eck,Alexander Smirnov,Yoram J. Kaufman,Michael D. King,Didier Tanré,Ilya Slutsker +8 more
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Optical Properties of Aerosols and Clouds: The Software Package OPAC
M. Hess,P. Koepke,I. Schult +2 more
TL;DR: In this article, the optical properties of aerosols and clouds are described, including extinction, scattering, and absorption coefficients, single scattering albedo, asymmetry parameter, and phase function.