1. Water on Mars Okyama University 2007. 06. 18
Water on Mars Okyama University Akos Kereszturi, PHD Collegium Budapest Eotvos Lorand University of Sciences Hungarian Astronomical Association

2. Change of our veiw on ancient Mars
Bone dry planet (Mariner-9)...

3. Change of our veiw on ancient Mars
…ancient channels (Viking probes)...

4. Change of our veiw on ancient Mars
…sometimes lakes (MGS)...

5. Change of our veiw on ancient Mars
…with a great northern ocean (MGS, MEX).

6. H2O budget Original H2O budget: Signs of liquid water:
channels, valleys
ocean shorelines
clay minerals
sediments deposited in water
theoretical models
Original H2O budget:
m global coverage

7. The poposed ancient ocean

8. Channels by surface runoff or sapping

9. 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

10. Water break up, outflow channels

11. Favourable periods for liquid water
South
Polar
Cap
- Argyre
- Uzboi
channel
system
sedimentary
delta
lake
sediments

12. Channel network  water source

13. H2O distribution today Almost all H2O is frozen:
60-80 % subsurface permafrost
10-30 % polar cap and polar sediments
0,1-0,01 % atmosphere

14. Signs of water today? - Gullies?

15. Slope straks?

16. DDS „seepages”?

17. Possible conditions for water today
very rarely
who knows…