change of our veiw on ancient mars
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Water on Mars Okyama University 2007.06.18. Akos Kereszturi , PHD Collegium Budapest Eotvos Lorand University of Sciences Hungarian Astronomical Association e-mail: kru@mcse . hu. Change of our veiw on ancient Mars. Bone dry planet (Mariner-9). Change of our veiw on ancient Mars. - PowerPoint PPT PresentationTRANSCRIPT
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Water on Mars
Okyama University2007.06.18.
Akos Kereszturi, PHDCollegium Budapest
Eotvos Lorand University of SciencesHungarian Astronomical Association
e-mail: [email protected]
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Change of our veiw on ancient Mars
Bone dry planet (Mariner-9)...
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…ancient channels (Viking probes)...
Change of our veiw on ancient Mars
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…sometimes lakes (MGS)...
Change of our veiw on ancient Mars
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…with a great northern ocean (MGS, MEX).
Change of our veiw on ancient Mars
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H2O budget
Signs of liquid water: • channels, valleys• ocean shorelines• clay minerals• sediments deposited in water• theoretical models
Original H2O budget: 20-400 m global coverage
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The poposed ancient ocean
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Channels by surface runoff or sapping
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Global cooling, surface freezing
Realtive small planetary mass:• small radioactive heat source• early stopped dinamo• weak gravity• fast atmospheric loss• decreasing greenhouse effect• decreasing volcanism• only early global tectonism• decreasing global temperature• formation of cryosphere
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Water break up, outflow channels
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Favourable periods for liquid water
sedimentarydelta
lakesediments
SouthPolarCap
- Argyre- Uzboichannelsystem
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Channel network water source
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H2O distribution today
Almost all H2O is frozen:• 60-80 % subsurface permafrost• 10-30 % polar cap and polar sediments• 0,1-0,01 % atmosphere
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Signs of water today? - Gullies?
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Slope straks?
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DDS „seepages”?
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Possible conditions for water today
• very rarely• who knows…