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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. and Sauer, D. and Esselborn, M. and Petzold, D. and Veira, A. and Rose, M. and Mund, S. and Wirth, M. and Ansmann, A. and Tesche, M. and Gross, S. and 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, pp. 589-618. DOI: 10.1111/j.1600-0889.2011.00566.x.

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

Abstract

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.

Document Type:Article
Title: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
Authors:
AuthorsInstitution or Email of Authors
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
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.1600-0889.2011.00566.x
Page Range:pp. 589-618
Status:Published
Keywords:SAMUM
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space, Aeronautics, Transport
HGF - Program Themes:Earth Observation, ATM and Operation, Transport System
DLR - Research area:Raumfahrt, Aeronautics, Transport
DLR - Program:R EO - Erdbeobachtung, L AO - Air Traffic Management and Operation, V VS - Verkehrssystem
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung, L - Climate, Weather and Environment, V - Verkehrsentwicklung und Umwelt (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Jana Freund
Deposited On:01 Aug 2011 13:00
Last Modified:12 Dec 2013 21:20

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