Dust mobilization and transport in the northern Sahara during SAMUM 2006 - a meteorological overview.

Knippertz, P., Ansmann, A., Althausen, D., Müller, D., Tesche, M., Bierwirth, E., Dinter, T., Müller, T., von Hoyningen-Huene, W., Schepanski, Kerstin, Wendisch, M., Heinold, B., Kandler, K., Petzold, A., Schütz, L. and Tegen, I. (2009) Dust mobilization and transport in the northern Sahara during SAMUM 2006 - a meteorological overview. Open Access Tellus B: Chemical and physical meteorology, 61 . pp. 12-31. DOI 10.1111/j.1600-0889.2008.00380.x.

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Abstract

The SAMUM field campaign in southern Morocco in May/June 2006 provides valuable data to study the emission, and the horizontal and vertical transports of mineral dust in the Northern Sahara. Radiosonde and lidar observations show
differential advection of air masses with different characteristics during stable nighttime conditions and up to 5-km deep
vertical mixing in the strongly convective boundary layer during the day. Lagrangian and synoptic analyses of selected dust periods point to a topographic channel from western Tunisia to central Algeria as a dust source region. Significant emission events are related to cold surges from the Mediterranean in association with eastward passing upper-level waves and lee cyclogeneses south of the Atlas Mountains. Other relevant events are local emissions under a distinct cut-off low over northwestern Africa and gust fronts associated with dry thunderstorms over the Malian and Algerian Sahara. The latter are badly represented in analyses from the European Centre for Medium–Range Weather Forecasts and in a regional dust model, most likely due to problems with moist convective dynamics and a lack of observations in this region. This aspect needs further study. The meteorological source identification is consistent with estimates of
optical and mineralogical properties of dust samples.

Document Type: Article
Keywords: Sahara, SAMUM, dust
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1111/j.1600-0889.2008.00380.x
ISSN: 0280-6509
Projects: SAMUM
Date Deposited: 28 Jan 2010 15:38
Last Modified: 24 Jan 2019 09:50
URI: http://oceanrep.geomar.de/id/eprint/1108

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