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Optical and microphysical properties of smoke over Cape Verde inferred from multiwavelength lidar measurements

Tesche, M. and Müller, D. and Groß, S. and Ansmann, A. and Althausen, D. and Freudenthaler, T. and Weinzierl, B. and Veira, A. and Petzold, A. (2011) Optical and microphysical properties of smoke over Cape Verde inferred from multiwavelength lidar measurements. Tellus B - Chemical and Physical Meteorology, 63B, pp. 677-694. DOI: 10.1111/j.1600-0889.2011.00549.x.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1600-0889.2011.00549.x/pdf

Abstract

Lidar measurements of mixed dust/smoke plumes over the tropical Atlantic ocean were carried out during the winter campaign of SAMUM-2 at Cape Verde. Profiles of backscatter and extinction coefficients, lidar ratios, and Ångstr¨om exponents related to pure biomass-burning aerosol from southern West Africa were extracted from these observations. Furthermore, these findings were used as input for an inversion algorithm to retrieve microphysical properties of pure smoke. Seven measurement days were found suitable for the procedure of aerosol-type separation and successive inversion of optical data that describe biomass-burning smoke. We inferred high smoke lidar ratios of 87 ± 17 sr at 355 nm and 79 ± 17 sr at 532 nm. Smoke lidar ratios and Ångstr¨om exponents are higher compared to the ones for the dust/smoke mixture. These numbers indicate higher absorption and smaller sizes for pure smoke particles compared to the dust/smoke mixture. Inversion of the smoke data set results in mean effective radii of 0.22 ± 0.08 μm with individual results varying between 0.10 and 0.36 μm. The single-scattering albedo for pure biomass-burning smoke was found to vary between 0.63 and 0.89 with a very low mean value of 0.75 ± 0.07. This is in good agreement with findings of airborne in situ measurements which showed values of 0.77 ± 0.03. Effective radii from the inversion were similar to the ones found for the fine mode of the in situ size distributions.

Document Type:Article
Title:Optical and microphysical properties of smoke over Cape Verde inferred from multiwavelength lidar measurements
Authors:
AuthorsInstitution or Email of Authors
Tesche, M.ift Leipzig
Müller, D.IFT Leipzig
Groß, S.LMU München
Ansmann, A.ift Leipzig
Althausen, D.ift Leipzig
Freudenthaler, T.LMU München
Weinzierl, B.DLR
Veira, A.DLR
Petzold, A.DLR
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.1600-0889.2011.00549.x
Page Range:pp. 677-694
Status:Published
Keywords:Lidar, SAMUM-2
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space, Aeronautics
HGF - Program Themes:Earth Observation, ATM and Operation
DLR - Research area:Raumfahrt, Aeronautics
DLR - Program:R EO - Erdbeobachtung, L AO - Air Traffic Management and Operation
DLR - Research theme (Project):R - Vorhaben LIDAR-Forschung und -Entwicklung, L - Climate, Weather and Environment
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Jana Freund
Deposited On:01 Aug 2011 12:54
Last Modified:12 Dec 2013 21:20

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