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Formation of frozen CO2 clouds is also a problem for keeping the early Earth from freezing over via high CO2 concentrations.

I have to wonder if their model's output would change based on the fact there /was/ an ocean in the northern hemisphere: they have found what appears to be shorelines and it also explains why there is so little drainage activity.

Large bodies of water have a massive impact on both thermal and circulation models.

Could there have been enough salt to keep that ocean liquid even at much lower temperature? Or, are the shorelines consistent with an ocean with a thick ice cover?

EDIT: AH! Dissolved CO2 will depress the freezing point.

Edited at 2012-11-29 02:30 am (UTC)

That's /definitely/ something that needs to be added to a model...

Looking at some phase diagrams, I'm wondering if I'm right.

You can cool soda water below the freezing point of water, so it freezes when you release pressure, but I'm wondering if that works because the soda water is in a metastable state.

There's also the matter of forming CO2-water hydrates.

For a while I'd hear now and then about models of Mars in which there was never any liquid water at all (except possibly for momentary melt events), and all the supposed stream beds and such were explained as flows of something else. I was kind of half-cheering for them just because they were so weird. But I presume they're dead or nearly so.

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