Antarctique ; Barkhane ; Changement climatique ; Circulation atmosphérique ; Dry Valleys ; Dune ; Désert ; Eolien ; Périglaciaire ; Région polaire ; Transport éolien ; Zone froide
Aeolian features ; Aeolian transport ; Antarctica ; Atmospheric circulation ; Barchan ; Climatic change ; Cold area ; Desert ; Dune ; Periglacial features ; Polar region
Meteorological controls on sand transport and changes in dune morphology were monitored for 11 days in November-December 2004 on a barchan dune in the Victoria Valley, McMurdo Dry Valleys. Sand transport in this environment was found
southwesterly winds were found to promote aeolian processes by dislodging surface sediments, with dune morphology responding rapidly. As a result, change in the morphology of the dunes of the Victoria Valley may provide an early indication of change in regional
weather and climate, possibly due to global climate change.
soil textures and aggregations; and 2) to make practical predictions of sand movement based on the condition of the surface soil. An increase of A usually corresponds to soil changing from an aggregated state to a looser state.