Early Mars: How Warm and How Wet?

Details Early Mars: How Warm and How Wet? Early Mars: How Warm and How Wet?

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994sci...265..744s&link_type=abstract

Science, Volume 265, Issue 5173, pp. 744-749

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130

Scientific paper

Early in its history, Mars underwent fluvial erosion that has been interpreted as evidence for a warmer, wetter climate. However, no atmosphere composed of only CO_2 and H_2O appears capable of producing mean planetary temperatures even close to 0^circC. Rather than by precipitation, aquifer recharge and ground water seepage may have been enabled by hydrothermal convection driven by geothermal heat and heat associated with impacts. Some climatic warming was probably necessary to allow water to flow for long distances across the surface. Modest warming could be provided by even a low-pressure CO_2 atmosphere if it was supplemented with small amounts of CH_4, NH_3, or SO_2. Episodic excursions to high obliquities may also have raised temperatures over some portions of the planet's surface.

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