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DOI: 10.5445/IR/1000045982

A climatology of dust emission events from northern Africa using long-term surface observations

Cowie, S.M.; Knippertz, P.; Marsham, J.H.

Abstract:
Long-term (1984-2012) surface observations from 70 stations in the Sahara and Sahel are used to explore the diurnal, seasonal and geographical variations in dust emission events and thresholds. The frequency of dust emission (FDE) is calculated using the present weather codes of SYNOP reports. Thresholds are estimated as the wind speed for which there is a 50% probability of dust emission and are then used to calculate strong wind frequency (SWF) and dust uplift potential (DUP), where the latter is an estimate of the dust-generating power of winds. Stations are grouped into six coherent geographical areas for more in-depth analysis.

FDE is highest at stations in Sudan and overall peaks in spring north of 23° N. South of this, where stations are directly influenced by the summer monsoon, the annual cycle in FDE is more variable. Thresholds are highest in northern Algeria, lowest in the latitude band 16-21° N and have greatest seasonal variations in the Sahel. Spatial variability in thresholds partly explain spatial variability in frequency of dust emission events on an annual basis. However, seasonal variations in thresholds for t ... mehr


Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Forschungsbereich Troposphäre (IMK-TRO)
Publikationstyp Zeitschriftenaufsatz
Jahr 2014
Sprache Englisch
Identifikator ISSN: 1680-7316
URN: urn:nbn:de:swb:90-459821
KITopen ID: 1000045982
HGF-Programm 12.01.02; LK 01
Erschienen in Atmospheric Chemistry and Physics
Band 14
Heft 16
Seiten 8579-8597
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
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