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AGU journal highlights -- Dec. 31, 2008
Date:1/2/2009

nd sand flux of migrating dunes. By using pairs of high-resolution optical satellite images taken at differing times, the authors monitored dune migration in the Bodl depression of northern Chad over time intervals of 1 month to 6.5 years. The displacement maps generated from each pair of satellite images were then used to automatically distinguish dunes from interdunes. By interpolating a surface between the interdune areas and subtracting it from the surface observed by the satellite images, the authors obtain dune heights and volumes over fine spatial and temporal scales. From this, pixel-by-pixel estimates of sand flux were generated, allowing the authors to confirm that the Bodl contains some of the world's fastest moving dunes.

Title: Remotely sensed dune celerity and sand flux measurements of the world's fastest barchans (Bodl, Chad)

Authors: Pieter Vermeesch: School or Earth Sciences, Birkbeck College, University of London, London, U.K.;

Nick Drake: Department of Geography, King's College, University of London, London, U.K.

Source: Geophysical Research Letters (GRL) paper 10.1029/2008GL035921, 2008; http://dx.doi.org/10.1029/2008GL035921


4. Odd-looking Martian craters indicate hidden ice

Surface features common in the northern and southern midlatitudes of Mars and known as lobate debris aprons and lineated valley fill are believed to have formed either as debris flows mobilized by pore ice or as debris-covered glaciers. To learn more, Kress and Head define and analyze ring mold craters, which are abundant on debris aprons and lineated valley fill but not seen in surrounding terrain. Ring mold craters are concentric crater forms named for their similarity to the cooking implement, in contrast to the bowl-shaped craters that are common at such small sizes (hundreds of meters (hundreds to thousands of feet) in diameter)
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Contact: Peter Weiss
pweiss@agu.org
202-777-7507
American Geophysical Union
Source:Eurekalert

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