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Microphysical and optical properties of dust and tropical biomass burning aerosol layers in the Cape Verde region – An overview of the airborne in-situ and lidar measurements during SAMUM-2

Weinzierl, B. und Sauer, D. und Esselborn, M. und Petzold, D. und Veira, A. und Rose, M. und Mund, S. und Wirth, M. und Ansmann, A. und Tesche, M. und Gross, S. und Freudenthaler, V. (2011) Microphysical and optical properties of dust and tropical biomass burning aerosol layers in the Cape Verde region – An overview of the airborne in-situ and lidar measurements during SAMUM-2. Tellus B - Chemical and Physical Meteorology, 63B, Seiten 589-618. DOI: 10.1111/j.1600-0889.2011.00566.x.

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Offizielle URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1600-0889.2011.00566.x/pdf

Kurzfassung

In the framework of the Saharan Mineral Dust Experiment (SAMUM) airborne High Spectral Resolution Lidar and in situ measurements of the particle size, aerosol mixing state and absorption coefficient were conducted. Here, the properties of mineral dust and tropical biomass burning layers in the Cape Verde region in January/February 2008 are investigated and compared with the properties of fresh dust observed in May/June 2006 close the Sahara. In the Cape Verde area, we found a complex stratification with dust layers covering the altitude range below 2 km and biomass burning layers aloft. The aerosol type of the individual layers was classified based on depolarization and lidar ratios and, in addition, on in situ measured Ångström exponents of absorption °aap. The dust layers had a depth of 1.3 ± 0.4 km and showed a median °aap of 3.95. The median effective diameter Deff was 2.5 μm and the dust layers over Cape Verde yielded clear signals of aging: large particles were depleted due to gravitational settling and the accumulation mode diameter was shifted towards larger sizes as a result of coagulation. The tropical biomass layers had a depth of 2.0 ± 1.1 km and were characterized by a median °aap of 1.34. They always contained a certain amount of large dust particles and showed a median Deff of 1.1 μm and a fine mode Deff,fine of 0.33. The dust and biomass burning layers had a median aerosol optical depth (AOD) of 0.23 and 0.09, respectively. The median contributions to the AOD of the total atmospheric column below 10 km were 75 and 37%, respectively.

Dokumentart:Zeitschriftenbeitrag
Titel:Microphysical and optical properties of dust and tropical biomass burning aerosol layers in the Cape Verde region – An overview of the airborne in-situ and lidar measurements during SAMUM-2
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Weinzierl, B.DLR
Sauer, D.LMU München
Esselborn, M.DLR
Petzold, D.DLR
Veira, A.DLR
Rose, M.DLR
Mund, S.DLR
Wirth, M.DLR
Ansmann, A.ift Leipzig
Tesche, M.ift Leipzig
Gross, S.LMU München
Freudenthaler, V.LMU München
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.1600-0889.2011.00566.x
Seitenbereich:Seiten 589-618
Status:veröffentlicht
Stichwörter:SAMUM
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt, Luftfahrt, Verkehr
HGF - Programmthema:Erdbeobachtung, ATM und Flugbetrieb, Verkehrssystem
DLR - Schwerpunkt:Raumfahrt, Luftfahrt, Verkehr
DLR - Forschungsgebiet:R EO - Erdbeobachtung, L AO - Luftverkehrsmanagement und Flugbetrieb, V VS - Verkehrssystem
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Atmosphären- und Klimaforschung, L - Klima, Wetter und Umwelt, V - Verkehrsentwicklung und Umwelt (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Atmosphärische Spurenstoffe
Hinterlegt von: Jana Freund
Hinterlegt am:01 Aug 2011 13:00
Letzte Änderung:12 Dez 2013 21:20

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