Spectral Study of Water Tracks as an Analog for Recurring Slope Lineae
Liquid water is a key requirement for life on Earth, and serves as an important constraint on present day habitability on Mars. Recurring Slope Lineae (RSL) are a unique phenomenon on Mars that may be formed by brine seeps. Their morphological, seasonal and temporal characteristics support this hypo...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20140005547 2023-05-15T13:47:44+02:00 Spectral Study of Water Tracks as an Analog for Recurring Slope Lineae Ojha, L. Wray, J. J. Wilhelm, M. B. Unclassified, Unlimited, Publicly available August 5, 2013 application/pdf http://hdl.handle.net/2060/20140005547 unknown Document ID: 20140005547 http://hdl.handle.net/2060/20140005547 Copyright, Distribution as joint owner in the copyright CASI Geosciences (General) Lunar and Planetary Science and Exploration ARC-E-DAA-TN10241 Analog Sites for Mars Missions 2: Past, Present and Future Missions to Mars; Aug 05, 2013 - Aug 07, 2013; Washington, DC; United States 2013 ftnasantrs 2019-08-31T23:09:55Z Liquid water is a key requirement for life on Earth, and serves as an important constraint on present day habitability on Mars. Recurring Slope Lineae (RSL) are a unique phenomenon on Mars that may be formed by brine seeps. Their morphological, seasonal and temporal characteristics support this hypothesis; however, spectral evidence has been lacking. Ojha et al., 2013 recently analyzed CRISM images from all confirmed RSL in the southern mid-latitudes and equatorial regions and found no spectro-scopic evidence for water. Instead, enhanced abun-dances or distinct grain sizes of both ferric and ferrous minerals are observed at most sites. The strength of these spectral signatures changes as a function of sea-son, possibly indicating removal of a fine-grained sur-face component during RSL flow, precipitation of fer-ric oxides, and/or wetting of the substrate. Water tracks (WT) have been suggested as a terrestrial analog for RSL by Levy et al., 2011. WT are defined as dark surface features that extend downslope in a linear or branching fashion, usually oriented along the steepest local gradient, in the Dry Valleys of Antarctica. They can be 1-3 m in width and can have lengths up to 2 km. They share many morphological and seasonal characteristics with RSL including active growth during summer seasons and fading during winter. Snowmelt, ground ice melt and deliquescence by hygroscopic salts have been suggested as possible formation mechanisms for water tracks. No spectral work to date has been reported for water tracks. Other/Unknown Material Antarc* Antarctica NASA Technical Reports Server (NTRS) Levy ENVELOPE(-66.567,-66.567,-66.320,-66.320) |
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Open Polar |
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NASA Technical Reports Server (NTRS) |
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Geosciences (General) Lunar and Planetary Science and Exploration |
spellingShingle |
Geosciences (General) Lunar and Planetary Science and Exploration Ojha, L. Wray, J. J. Wilhelm, M. B. Spectral Study of Water Tracks as an Analog for Recurring Slope Lineae |
topic_facet |
Geosciences (General) Lunar and Planetary Science and Exploration |
description |
Liquid water is a key requirement for life on Earth, and serves as an important constraint on present day habitability on Mars. Recurring Slope Lineae (RSL) are a unique phenomenon on Mars that may be formed by brine seeps. Their morphological, seasonal and temporal characteristics support this hypothesis; however, spectral evidence has been lacking. Ojha et al., 2013 recently analyzed CRISM images from all confirmed RSL in the southern mid-latitudes and equatorial regions and found no spectro-scopic evidence for water. Instead, enhanced abun-dances or distinct grain sizes of both ferric and ferrous minerals are observed at most sites. The strength of these spectral signatures changes as a function of sea-son, possibly indicating removal of a fine-grained sur-face component during RSL flow, precipitation of fer-ric oxides, and/or wetting of the substrate. Water tracks (WT) have been suggested as a terrestrial analog for RSL by Levy et al., 2011. WT are defined as dark surface features that extend downslope in a linear or branching fashion, usually oriented along the steepest local gradient, in the Dry Valleys of Antarctica. They can be 1-3 m in width and can have lengths up to 2 km. They share many morphological and seasonal characteristics with RSL including active growth during summer seasons and fading during winter. Snowmelt, ground ice melt and deliquescence by hygroscopic salts have been suggested as possible formation mechanisms for water tracks. No spectral work to date has been reported for water tracks. |
format |
Other/Unknown Material |
author |
Ojha, L. Wray, J. J. Wilhelm, M. B. |
author_facet |
Ojha, L. Wray, J. J. Wilhelm, M. B. |
author_sort |
Ojha, L. |
title |
Spectral Study of Water Tracks as an Analog for Recurring Slope Lineae |
title_short |
Spectral Study of Water Tracks as an Analog for Recurring Slope Lineae |
title_full |
Spectral Study of Water Tracks as an Analog for Recurring Slope Lineae |
title_fullStr |
Spectral Study of Water Tracks as an Analog for Recurring Slope Lineae |
title_full_unstemmed |
Spectral Study of Water Tracks as an Analog for Recurring Slope Lineae |
title_sort |
spectral study of water tracks as an analog for recurring slope lineae |
publishDate |
2013 |
url |
http://hdl.handle.net/2060/20140005547 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(-66.567,-66.567,-66.320,-66.320) |
geographic |
Levy |
geographic_facet |
Levy |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
CASI |
op_relation |
Document ID: 20140005547 http://hdl.handle.net/2060/20140005547 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766247786399924224 |