Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p41b1369z&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P41B-1369
Other
1824 Geomorphology: General (1625), 5464 Remote Sensing, 5470 Surface Materials And Properties, 6225 Mars
Scientific paper
Transverse Aeolian Ridge (TAR) is the nongenetic term for linear to curvilinear aeolian features on Mars that could result from either dune or ripple formation processes. These features are typically oriented with their crests perpendicular to the dominant wind direction in the area, as indicated by other wind-related features or as would be confined by surrounding topography. Three High Resolution Imaging Science Experiment (HiRISE) images provide important new information about TARs through the increase in spatial resolution of HiRISE as compared to Viking or Mars Orbiter Camera images. TARs on the floor of Ius Chasma show remarkably symmetric profiles with average slopes of about 15 degrees. On the floor of the Gamboa impact crater, in the northern lowlands, dark dunes are surrounded by small TARs that appear to be large ripples comparable to granule ripples on Earth. TARs in the cratered highlands of Terra Sirenum have thin tapered extensions and textured surfaces that suggest these features could be erosional remnants rather than pristine depositional landforms. Context Imager (CTX) views usually fail to resolve details of individual TARs but they do document the local distribution of these features. The new observations generally support a reversing dune origin for TARs with wavelengths greater than 15 m and a granule ripple origin for TARs in the wavelength range of 3 to 15 m. TARs with a wavelength around 15 m can display attributes suggesting either dune or ripple origins. A recently funded Mars Data Analysis Program grant will allow the capabilities of the instruments on the Mars Reconnaissance Orbiter to be applied to many examples of these intriguing features.
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