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LATITUDINAL SURVEY OF PERIGLACIAL LANDFORMS AND GULLIES IN EASTERN ARGYRE AND POLEWARDS ON MARS.

Poster (konferens)
Författare Andreas Johnsson
Mats Olvmo
Dennis Reiss
Harald Hiesinger
Publicerad i 40th Lunar and Planetary Science Conference
Nummer/häfte 2405
Publiceringsår 2009
Publicerad vid Institutionen för geovetenskaper
Språk en
Länkar www.lpi.usra.edu/meetings/lpsc2009/...
Ämnesord Mars, periglacial, polygons, gully
Ämneskategorier Planetsystemet, Geovetenskap och miljövetenskap, Fysisk geografi

Sammanfattning

On Earth periglacial features consists of an arrange of landforms with ground ice affinities, which involves different formation processes. On Mars there are extensive areas of ground ice which display a range of landforms similar to those on Earth. These landforms are important in understanding late climate evolution, subsurface processes and surface atmosphere interaction on Mars. In our study we focus on patterned ground, thermokarst and gullies. Patterned ground can be divided in to non-active (annual frozen) layer features like thermal contraction polygons and sublimation polygons, and active layer (freeze and thaw) features like sorted nets and circles, striated soils and stripes. Previous investigations have mainly looked at the global distribution and seasonal changes in patterned ground. A recent study using high resolution HiRISE images hypothezise that active layer patterns of sorted circles occur on Mars which would have important implications for late climate evolution. We are currently performing a detailed investigation of the Argyre area 325º - 335º E and 30º S – 90º S using all available MOC, HiRISE, HRSC, THEMIS and MOLA data. The area was chosen due to a wide diversity of periglacial landforms, a large difference in elevation, and for the past glacial and hydrologic history of the Argyre basin. The focus of this ongoing work is to investigate the influence by changes in topography, ground conditions, geologic context and latitude on a local and regional level. One addressed question is of micro climate zonation and its implication for late climate evolution.

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