Hydrology and Land Surface Studies
Multiple dust sources in the Sahara Desert: The importance of sand dunes
Article first published online: 12 JUL 2012
©2012. American Geophysical Union. All Rights Reserved.
Geophysical Research Letters
Volume 39, Issue 13, July 2012
How to Cite
2012), Multiple dust sources in the Sahara Desert: The importance of sand dunes, Geophys. Res. Lett., 39, L13401, doi:10.1029/2012GL052145., , , , and (
- Issue published online: 12 JUL 2012
- Article first published online: 12 JUL 2012
- Manuscript Accepted: 8 JUN 2012
- Manuscript Received: 25 APR 2012
- Sahara Desert;
- dust cources;
- sand dunes
 We determine the current sources of dust in the Sahara Desert using quantitative correlation between the number of days with dust storms (NDS), derived from remote-sensing data of high temporal resolution, with the distribution of the soil types and geomorphic units. During 2006–8 the source of over 90% of the NDS was found to be sand dunes, leptosols, calcisols, arenosols, and rock debris. In contrast to previous studies, only few dust storms originated from playas and dry lake beds. Land erodibility was estimated by regressing the NDS to the number of days with high-speed wind events, and was found to be high for sand dunes. Clay and fine-silt grains and aggregates are scarce in sand dunes, which most likely produce dust particles through aeolian abrasion of sand grains. Thus, saltating sand grains impacting clay aggregates on playa surfaces cannot be the sole process for generating dust in the Sahara.