The history of Martian volatiles

摘要: The behavior of water and other volatiles on Mars is key to understanding the evolution climate. early climate played a fundamental role in producing observed surface morphology possibly enabling existence an biosphere. Geochemical isotopic data can be used infer history volatiles. On basis from atmosphere components (as measured meteorites that come Mars), there appear at least two reservoirs volatiles, one has undergone exchange with been isotopically fractionated, second unfractionated may represent juvenile gases. fractionation atmospheric component occurred primarily through escape gas space. In addition, gases have mixed substantially crustal Such aqueous or hydrothermal environments. space, as driven by properties Sun time, consistent geomorphology. Together, they suggest environment was different present time colder, dryer