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

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

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

Kurzfassung

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.

Dokumentart:Zeitschriftenbeitrag
Titel:Optical and microphysical properties of smoke over Cape Verde inferred from multiwavelength lidar measurements
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
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
Datum:2011
Erschienen in:Tellus B - Chemical and Physical Meteorology
Referierte Publikation:Ja
In Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:63B
DOI :10.1111/j.1600-0889.2011.00549.x
Seitenbereich:Seiten 677-694
Status:veröffentlicht
Stichwörter:Lidar, SAMUM-2
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt, Luftfahrt
HGF - Programmthema:Erdbeobachtung, ATM und Flugbetrieb
DLR - Schwerpunkt:Raumfahrt, Luftfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung, L AO - Luftverkehrsmanagement und Flugbetrieb
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben LIDAR-Forschung und -Entwicklung, L - Klima, Wetter und Umwelt
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Atmosphärische Spurenstoffe
Hinterlegt von: Jana Freund
Hinterlegt am:01 Aug 2011 12:54
Letzte Änderung:12 Dez 2013 21:20

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