Seepage-induced penetration of water vapor and dust beneath ripples and dunes

We present stratigraphic measurements of humidity and bulk density beneath the surface of a barchan dune obtained with a capacitance probe. A model shows that air seeping through the sand bed in response to spatial variations of static pressure along the ripple surface guides water vapor through rip...

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Bibliographic Details
Published in:Journal of Geophysical Research 2010-04, Vol.115 (F2), p.n/a
Main Authors: Louge, M. Y., Valance, A., Mint Babah, H., Moreau-Trouvé, J.-C., Ould el-Moctar, A., Dupont, P., Ould Ahmedou, D.
Format: Article
Language:English
Subjects:
Desertification
Dunes
Dust
Earth Sciences
Earth, ocean, space
Evapotranspiration
Exact sciences and technology
Geology
Geophysics
Humidity
Hydrology
moisture
Physics
Ripples
Sand
sand ripples
Sciences of the Universe
Scientific apparatus & instruments
Static pressure
Stores
Water vapor
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Summary:We present stratigraphic measurements of humidity and bulk density beneath the surface of a barchan dune obtained with a capacitance probe. A model shows that air seeping through the sand bed in response to spatial variations of static pressure along the ripple surface guides water vapor through ripple crests and gradually stores dust beneath troughs. The accumulated dust remains trapped beneath the relatively compact trough surface until wind is violent enough to mobilize sand deeply.
ISSN:0148-0227
2169-9003
2156-2202
2169-9011
DOI:10.1029/2009JF001385