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Mixing of mineral dust with urban pollution aerosol over Dakar (Senegal): Impact on dust physico-chemical and radiative properties.

Petzold, A. and Veira, A. and Mund, S. and Esselborn, M. and Kiemle, C. and Weinzierl, B. and Hamburger, T. and Ehret, G. and Lieke, K. and Kandler, K. (2011) Mixing of mineral dust with urban pollution aerosol over Dakar (Senegal): Impact on dust physico-chemical and radiative properties. Tellus B - Chemical and Physical Meteorology, 63B, pp. 619-634. DOI: 10.1111/j.1600-0889.2011.00547.x.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1600-0889.2011.00547.x/pdf

Abstract

In the framework of the Saharan Mineral Dust Experiment (SAMUM) in 2008, the mixing of the urban pollution plume of Dakar (Senegal) with mineral dust was studied in detail using the German research aircraft Falcon which was equipped with a nadir-looking high spectral resolution lidar (HSRL) and extensive aerosol in situ instrumentation. The mineral dust layer as well as the urban pollution plume were probed remotely by the HSRL and in situ. Back trajectory analyses were used to attribute aerosol samples to source regions.We found that the emission from the region of Dakar increased the aerosol optical depth (532 nm) from approximately 0.30 over sea and over land east of Dakar to 0.35 in the city outflow. In the urban area, local black carbon (BC) emissions, or soot respectively, contributed more than 75% to aerosol absorption at 530 nm. In the dust layer, the single-scattering albedo at 530 nm was 0.96 â�� 0.99, whereas we found a value of 0.908 �± 0.018 for the aerosol dominated by urban pollution. After 6h of transport over the North Atlantic, the externally mixed mode of secondary aerosol particles had almost completely vanished, whereas the BC agglomerates (soot) were still externally mixed with mineral dust particles.

Document Type:Article
Title:Mixing of mineral dust with urban pollution aerosol over Dakar (Senegal): Impact on dust physico-chemical and radiative properties.
Authors:
AuthorsInstitution or Email of Authors
Petzold, A.DLR
Veira, A.DLR
Mund, S.DLR
Esselborn, M.DLR
Kiemle, C.DLR
Weinzierl, B.DLR
Hamburger, T.DLR
Ehret, G.DLR
Lieke, K.TU Darmstadt
Kandler, K.TU Darmstadt
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.1600-0889.2011.00547.x
Page Range:pp. 619-634
Status:Published
Keywords:SAMUM, aerosol particles, mineral dust particles
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben LIDAR-Forschung und -Entwicklung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Jana Freund
Deposited On:01 Aug 2011 12:49
Last Modified:12 Dec 2013 21:20

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