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Martian Hydrology
ngunn
post Nov 23 2010, 08:46 PM
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An interesting article from Space Daily today: http://www.marsdaily.com/reports/Shallow_G...n_Mars_999.html
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machi
post Dec 8 2010, 03:44 PM
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Phase transitions (for example melting) of all chemical substances are dependent on pressure and temperature.
You can found phase from phase diagram. Some informations for instance here http://www.chemguide.co.uk/physical/phasee...phasediags.html or on wikipedia.
Some regions on Mars (Hellas Planitia) have conditions (temperature, pressure) close to so called triple point of water, thus liquid water on Mars is theoretically possible (at least for some time in the Martian year).
But amount of water vapour in Martian atmosphere is low and we haven't still accurate informations about subsurface water in equatorial regions of Mars (we need some hi-res SHARAD).

" Also, as pressure increases, melting points definitely do decrease, which is what allows Lake Vostok to remain (likely) in liquid form."

This isn't only because of pressure, but also heat from Earth's interior play role. Amount of interior heat in Martian case is minimal (compared to Earth).
And with antifreezing substances, water can be liquid even at much lower temperature (with ammoniac and so on).


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- ngunn   Martian Hydrology   Nov 23 2010, 08:46 PM
- - marsbug   How big would such an aquifer need to be to be pic...   Nov 27 2010, 08:53 PM
- - ngunn   I'm curious about this too, and my ignorance o...   Nov 27 2010, 09:18 PM
- - marsbug   A very quick bit of reading tells me that SHARAD h...   Nov 27 2010, 09:45 PM
- - ngunn   We know that Mars has plenty of H2O, and that like...   Nov 27 2010, 10:14 PM
|- - Den   QUOTE (ngunn @ Nov 27 2010, 11:14 PM) We ...   Dec 7 2010, 06:39 PM
- - ZLD   Quoting the Wikipedia entry on Martian Climate: Q...   Dec 7 2010, 07:15 PM
|- - Den   QUOTE (ZLD @ Dec 7 2010, 08:15 PM) Quotin...   Dec 8 2010, 02:00 AM
- - djellison   Den and ZLD - you're both forgetting one vital...   Dec 7 2010, 07:26 PM
|- - Den   QUOTE (djellison @ Dec 7 2010, 08:26 PM) ...   Dec 8 2010, 02:03 AM
- - ZLD   And most people forget that the ground has pressur...   Dec 7 2010, 08:06 PM
|- - Den   QUOTE (ZLD @ Dec 7 2010, 09:06 PM) And mo...   Dec 8 2010, 02:19 AM
|- - ZLD   QUOTE (Den @ Dec 8 2010, 03:19 AM) Water ...   Dec 8 2010, 03:47 AM
||- - Den   QUOTE (ZLD @ Dec 8 2010, 04:47 AM) That i...   Dec 8 2010, 05:19 AM
|- - ElkGroveDan   QUOTE (Den @ Dec 7 2010, 06:19 PM) Meltin...   Dec 8 2010, 05:11 AM
- - djellison   That paper is 10 years old, and many other studies...   Dec 7 2010, 08:54 PM
- - ZLD   I remember a while back spirit recording a tempera...   Dec 8 2010, 05:53 AM
|- - Den   QUOTE (ZLD @ Dec 8 2010, 06:53 AM) I reme...   Dec 8 2010, 11:21 AM
- - machi   Phase transitions (for example melting) of all che...   Dec 8 2010, 03:44 PM
- - sariondil   For those with access to 'Icarus': Articl...   Dec 8 2010, 04:15 PM
- - Fran Ontanaya   Is brine lost so fast to evaporation in those cond...   Dec 8 2010, 06:00 PM
- - ZLD   QUOTE Conclusions - The presence of salts on and i...   Dec 8 2010, 07:48 PM
- - ngunn   Thanks for the link. A good read indeed.   Dec 8 2010, 08:32 PM
- - marsbug   Thanks for that, its a good resource for anyone tr...   Dec 9 2010, 01:38 AM
- - sariondil   Another paper on modelling of subsurface water. Ag...   Dec 9 2010, 09:23 PM
|- - ngunn   QUOTE (sariondil @ Dec 9 2010, 09:23 PM) ...   Dec 9 2010, 09:45 PM
|- - djellison   QUOTE (sariondil @ Dec 9 2010, 01:23 PM) ...   Dec 9 2010, 09:48 PM
- - ngunn   The way we are just now I supose censorhip is an i...   Dec 10 2010, 12:11 AM
- - helvick   Much as I might be rabidly opposed to Elsevier...   Dec 10 2010, 12:43 AM
- - ElkGroveDan   I have to agree with Helvick.   Dec 10 2010, 01:19 AM
- - imipak   A reminder of the the discussion of the notorious...   Dec 17 2010, 02:30 PM


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