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

Schepanski, K., Tegen, I., Todd, M. C., Heinold, B., Bönisch, G., Laurent, B., et al. (2009). Meteorological processes forcing Saharan dust emission inferred from MSG-SEVIRI observations of subdaily dust source activation and numerical models. Journal of Geophysical Research - Atmospheres, 114(10201), D10201. doi:10.1029/2008JD010325.

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Schepanski, K., Author
Tegen, I., Author
Todd, M. C., Author
Heinold, B., Author
Bönisch, Gerhard1, Author           
Laurent, B., Author
Macke, A., Author
Affiliations:
1Department Biogeochemical Synthesis, Prof. C. Prentice, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497753              

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Free keywords: Low-level jet West-african monsoon Intertropical discontinuity region Stable boundary-layer System lm-muscat Nocturnal jet Diurnal cycle Source areas Desert dust Samum 2006
 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 degrees x 1 degrees 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. [References: 80]

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Language(s): eng - English
 Dates: 2009
 Publication Status: Issued
 Pages: -
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 Identifiers: DOI: 10.1029/2008JD010325
Other: BGC1246
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Title: Journal of Geophysical Research - Atmospheres
Source Genre: Journal
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Pages: - Volume / Issue: 114 (10201) Sequence Number: - Start / End Page: D10201 Identifier: ISSN: 0148-0227