Journal
SCIENCE
Volume 318, Issue 5858, Pages 1903-1907Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1147039
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Ancient Mars had liquid water on its surface and a CO(2)-rich atmosphere. Despite the implication that massive carbonate deposits should have formed, these have not been detected. On the basis of fundamental chemical and physical principles, we propose that climatic conditions enabling the existence of liquid water were maintained by appreciable atmospheric concentrations of volcanically degassed SO(2) and H(2)S. The geochemistry resulting from equilibration of this atmosphere with the hydrological cycle is shown to inhibit the formation of carbonates. We propose an early martian climate feedback involving SO2, much like that maintained by CO(2) on Earth.
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