Seasonal Variations in the Topography of Mars from the Mars Orbiter Laser Altimeter

Details Seasonal Variations in the Topography of Mars from the Mars Orbiter Laser Altimeter Seasonal Variations in the Topography of Mars from the Mars Orbiter Laser Altimeter

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p32e..10z&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #P32E-10

Physics

3346 Planetary Meteorology (5445, 5739), 5462 Polar Regions, 5464 Remote Sensing

Scientific paper

Over the course of its year, Mars exchanges up to a third of its carbon dioxide atmosphere with the surface, due primarily to seasonal variations in solar insolation. Using topography collected over more than one Mars year from the Mars Orbiter Laser Altimeter on the Mars Global Surveyor spacecraft, we have measured temporal changes in the elevation of the Martian surface that correlate with the expected cycle of carbon dioxide exchange. For both hemispheres the greatest elevation change (1.5-2 m) occurred at high latitudes (>80° ), but most mass was deposited at lower latitudes (<70° ). The southern polar region shows a more complex temporal and latitudinal deposition pattern than the north, though both polar regions displayed transient local accumulation during the summer. An unexpected period of sublimation in the northern hemisphere was observed during autumn due to atmospheric warming associated with regional dust storms in the southern hemisphere. The pattern of deposition and sublimation shows differences between the first and second Mars year of mapping. >http://ltpwww.gsfc.nasa.gov/tharsis/mola.html

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