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A time-dependent theory for the evolution of water on Mars is presented.


Biology Articles » Astrobiology » Pre-Global Surveyor evidence for Martian ground water » Figures

Figures
- Pre-Global Surveyor evidence for Martian ground water

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Fig. 1.   The log of the globally averaged depth of water stored in the Martian crust today (H1) and at early times Ho for two values of rho, the ratio of D/H in today's atmospheric water vapor to the primordial ratio (2.6 and 5.2). These results are for a simple unconstrained escape of hydrogen with a constant ratio of escape flux to H, the depth of the hydrogen supply.

figure 1

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Fig. 2.   The log of the globally averaged depth of water stored in the crust today (H1) and at early times Ho for two values of the total D/H fractionation rho = 2.6 and 5.2 and for two possible values of the fractionation occurring during tz, the time when Zagami apatites were crystallized, 1.04 and 1.01. Here, tz is 1.3.

figure 2

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Fig. 3.   The log of the globally averaged depth of water stored in the crust today (H1) and at times Ho for two values of the total D/H fractionation, rho = 2.6 and 5.2, and for two possible values of the fractionation occurring during tz, the time when Zagami apatites were crystallized, 1.04 and 1.01. Here, tz is 180 Myr.

figure 3

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