Meteorological processes forcing Saharan dust emission inferred from MSG-SEVIRI observations of sub-daily dust source activation and numerical models.

Schepanski, Kerstin, Tegen, I., Todd, M.C., Heinold, B., Bonisch, G., Laurent, B. and Macke, Andreas (2009) Meteorological processes forcing Saharan dust emission inferred from MSG-SEVIRI observations of sub-daily dust source activation and numerical models. Open Access Journal of Geophysical Research: Atmospheres, 114 . D10201. DOI 10.1029/2008JD010325.

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Abstract

Fifteen-minute Meteosat Second Generation (MSG) Spinning Enhanced Visible and Infrared Imager (SEVIRI) infrared dust index images are used to identify dust source areas. The observations of dust source activation (DSA) are compiled in a 1° × 1° map for the Sahara and Sahel, including temporal information at 3-hourly resolution. Here we use this data set to identify the most active dust source areas and the time of day when dust source activation occurs most frequently. In the Sahara desert 65% of DSA (March 2006 to February 2008) occurs during 0600–0900 UTC, pointing toward an important role of the breakdown of the nocturnal low-level jet (LLJ) for dust mobilization. Other meteorological mechanisms may lead to dust mobilization including density currents initiated by deep convective systems which mobilize dust fronts (haboobs) occurring preferentially in the afternoon hours and cyclonic activities. The role of the nocturnal LLJ for dust mobilization in the Sahara is corroborated by regional model studies and analysis of meteorological station data.

Document Type: Article
Keywords: dust mobilization; MSG-SEVIRI; Sahara
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2008JD010325
ISSN: 2169-8996
Date Deposited: 27 May 2009 10:15
Last Modified: 06 Feb 2018 12:46
URI: http://oceanrep.geomar.de/id/eprint/6569

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