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Dust mobilization and aerosol transport from West Africa to Cape Verde-a meteorological overview of SAMUM-2

Knippertz, Peter and Tesche, Matthias and Heinold, Bernd and Kandler, Konrad and Toledano, Carlos and Esselborn, Michael (2011) Dust mobilization and aerosol transport from West Africa to Cape Verde-a meteorological overview of SAMUM-2. Tellus B - Chemical and Physical Meteorology, 63 (4), pp. 430-447. Taylor & Francis. DOI: 10.1111/j.1600-0889.2011.00544.x ISSN 0280-6509

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Abstract

The second field campaign of the SAharan Mineral dUst experiMent (SAMUM-2) was performed between 15 January and 14 February 2008 at the airport of Praia, Cape Verde, and provided valuable information to study the westward transport of Saharan dust and the mixing with biomass-burning smoke and sea-salt aerosol. Here lidar, meteorological, and particle measurements at Praia, together with operational analyses, trajectories, and satellite and synoptic station data are used to give an overview of the meteorological conditions and to place other SAMUM-2 measurements into a large-scale context. It is demonstrated that wintertime dust conditions at Cape Verde are closely related to the movement and intensification of mid-latitude high-pressure systems and the associated pressure gradients at their southern flanks. These cause dust emission over Mauritania, Mali, and Niger, and subsequent westward transport to Cape Verde within about 1-5 d. Dust emissions often peak around midday, suggesting a relation to daytime mixing of momentum from nocturnal low-level jets to the surface. The dust layer over Cape Verde is usually restricted to the lowest 1.5 km of the atmosphere. During periods with near-surface wind speeds about 5.5 ms-1, a maritime aerosol layer develops which often mixes with dust from above. On most days, the middle levels up to about 5 km additionally contain smoke that can be traced back to sources in southern West Africa. Above this layer, clean air masses are transported to Cape Verde with the westerly flow at the southern side of the subtropical jet. The penetration of extra-tropical disturbances to low latitudes can bring troposphere-deep westerly flow and unusually clean conditions to the region.

Item URL in elib:https://elib.dlr.de/97006/
Document Type:Article
Title:Dust mobilization and aerosol transport from West Africa to Cape Verde-a meteorological overview of SAMUM-2
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Knippertz, PeterUniv of Leeds, Leeds, UKUNSPECIFIED
Tesche, MatthiasIfT, LeipzigUNSPECIFIED
Heinold, BerndUniv of Leeds, Leeds, UKUNSPECIFIED
Kandler, KonradTU DarmstadtUNSPECIFIED
Toledano, CarlosUniv Valladolid, SpainUNSPECIFIED
Esselborn, MichaelESO & DLR, IPAUNSPECIFIED
Date:2011
Journal or Publication Title:Tellus B - Chemical and Physical Meteorology
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:No
Volume:63
DOI :10.1111/j.1600-0889.2011.00544.x
Page Range:pp. 430-447
Publisher:Taylor & Francis
ISSN:0280-6509
Status:Published
Keywords:SAMUM, Saharan dust , lidar, trajectories
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 > Lidar
Deposited By: Kiemle, Dr.rer.nat. Christoph
Deposited On:09 Jul 2015 12:23
Last Modified:08 Mar 2018 18:52

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