elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Impressum | Kontakt | English
Schriftgröße: [-] Text [+]

Seasonal TES and MOC observations of the Rusell Crater dune field: recent surface runoff on a dune slope within the last Martian year ?

Reiss, D. und Jaumann, R. (2002) Seasonal TES and MOC observations of the Rusell Crater dune field: recent surface runoff on a dune slope within the last Martian year ? XXVII European Geophysical Society General Assembly, Nice, France, April 21-26, 2002.

Dieses Archiv kann nicht den gesamten Text zur Verfügung stellen.

Kurzfassung

Rill erosion on a dune slope in the Russell Crater dune field was detected on the high resolution Mars Orbiter Camera (MOC)-NA image M1901170 at 54.5°S and 347.3°W. Identical erosion features occur on dunes in the Green Crater at 53.0°S and 8.2°W. The identified erosional morphology differs from previously observed gully erosion elsewhere on Mars. Seasonal observations indicate that the extremely fresh appearing erosion might be caused by recent surface runoff within the last Martian year. The erosional features in the Russell Crater dune field are located on a 350 m high dune slope with a dip of about 8°. The erosion starts in small alcoves in a dendritic pattern at the dune crest and merges after a short distance into main channels, which have a parallel pattern following the slope topography. In contrast to all other observed gullies on Mars they run out and abruptly end at the dune base without a depositional apron. The morphological forms show strong affinity to rill erosion on Earth, except from the lack of an apron. The morphology of the rills indicates that overland flow caused the erosion. The image was acquired in mid autumn at LS 50°. The very fresh appearing rills suggest that the erosion took place by a defrosting process between late winter and mid spring indicated by seasonal observations of TES albedo and temperature data. The temperature increases from 148°K in winter up to an observed maximum temperature of 276°K (near the water ice sublimation temperature) in mid spring. In the same time period the albedo decreases from 0.3 to 0.1. We favour an erosion process by liquid water: the rills are located in absolute elevations of about 200 m and the retreat of the south polar cap leads to an increase of the atmospheric pressure in the southern spring which could allow liquid water to be stable in this region. The lack of a depositional apron may be caused by compaction of the dust material with potentially simultaneous sublimation of the fluid.

Dokumentart:Konferenzbeitrag (Paper)
Zusätzliche Informationen: LIDO-Berichtsjahr=2003,
Titel:Seasonal TES and MOC observations of the Rusell Crater dune field: recent surface runoff on a dune slope within the last Martian year ?
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Reiss, D.NICHT SPEZIFIZIERT
Jaumann, R.NICHT SPEZIFIZIERT
Datum:2002
Status:veröffentlicht
Veranstaltungstitel:XXVII European Geophysical Society General Assembly, Nice, France, April 21-26, 2002
Veranstalter :European Geophysical Society
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EW - Erforschung des Weltraums
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):NICHT SPEZIFIZIERT
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Weltraumsensorik und Planetenerkundung
Hinterlegt von: Susanne Pieth
Hinterlegt am:16 Sep 2005
Letzte Änderung:14 Jan 2010 19:21

Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags

Blättern
Suchen
Hilfe & Kontakt
Informationen
electronic library verwendet EPrints 3.3.12
Copyright © 2008-2013 Deutsches Zentrum für Luft- und Raumfahrt (DLR). Alle Rechte vorbehalten.