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Thermal infrared and visual observations of a water ice lag in the Mars southern summer

Geophysical Research Letters

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DOI: 10.1029/2005GL024211

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Abstract

We present thermal infrared and visual evidence for the existence of water ice lags in the early southern summer. The observed H2O-ice lags lay in and near a chasma and appears to survive between 6-8 sols past the sublimation of the CO2. Possible sources of the H2O that compose the lag are (1) atmospheric H2O that is incorporated into the seasonal cap during condensation, (2) cold trapping of atmospheric water vapor onto the surface of the cap in the spring, or (3) a combination of the 2 processes where water is released from the sublimating cap only to be transported back over the cap edge and cold trapped. We refer to this later process as the "Houben" effect which may enrich the amount of water contained in the seasonal cap at 85??S by as much as a factor of 15. This phenomenon, which has already been identified for the northern retreating cap, may present an important water transport mechanism in the Southern Hemisphere.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Thermal infrared and visual observations of a water ice lag in the Mars southern summer
Series title:
Geophysical Research Letters
DOI:
10.1029/2005GL024211
Volume
32
Issue:
24
Year Published:
2005
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geophysical Research Letters
First page:
1
Last page:
4
Number of Pages:
4