Observations of the north polar region of Mars from the Mars orbiter laser altimeter.
Science
; 282(5396): 2053-60, 1998 Dec 11.
Article
in En
| MEDLINE
| ID: mdl-9851922
ABSTRACT
Elevations from the Mars Orbiter Laser Altimeter (MOLA) have been used to construct a precise topographic map of the martian north polar region. The northern ice cap has a maximum elevation of 3 kilometers above its surroundings but lies within a 5-kilometer-deep hemispheric depression that is contiguous with the area into which most outflow channels emptied. Polar cap topography displays evidence of modification by ablation, flow, and wind and is consistent with a primarily H2O composition. Correlation of topography with images suggests that the cap was more spatially extensive in the past. The cap volume of 1.2 x 10(6) to 1.7 x 10(6) cubic kilometers is about half that of the Greenland ice cap. Clouds observed over the polar cap are likely composed of CO2 that condensed out of the atmosphere during northern hemisphere winter. Many clouds exhibit dynamical structure likely caused by the interaction of propagating wave fronts with surface topography.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Carbon Dioxide
/
Water
/
Mars
/
Ice
Language:
En
Journal:
Science
Year:
1998
Document type:
Article
Affiliation country:
United States