Other
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.341..514g&link_type=abstract
Nature (ISSN 0028-0836), vol. 341, Oct. 12, 1989, p. 514-516. Research supported by NASA.
Other
82
Climatology, Mars Atmosphere, Mars Surface, Planetary Geology, Valleys, High Resolution, Mars Photographs, Mars Volcanoes, Planetary Evolution, Water
Scientific paper
Theoretical models of early Martian atmospheric evolution describe the maintenance of a dense CO2 atmosphere and a warm, wet climate until the end of the heavy-bombardment phase of impacting. However, the presence of very young, earthlike fluvial valleys on the northern flank of Alba Patera conflicts with this scenario. Whereas the widespread ancient Martian valleys generally have morphologies indicative of sapping erosion by the slow outflow of subsurface water, the local Alba valleys were probably formed by surface-runoff processes. Because subsurface water flow might be maintained by hydrothermal energy inputs and because surface-runoff valleys developed late in Martian history, it is not necessary to invoke drastically different planet-wide climatic conditions to explain valley development on Mars. The Alba fluvial valleys can be explained by hydrothermal activity or outflow-channel discharges that locally modified the atmosphere, including precipitation and local overland flow on low-permeability volcanic ash.
Baker Victor R.
Gulick Virginia Claire
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