Wind-blown waves aren't the only way to get fluctuations in water-level, though.

There's also the direct effect of higher-pressure vs. lower-pressure weather systems. Admittedly, this would be inconsequential on a mars with 300mb pressure.

Also there's tidal forces. Doubt Phobos & Diemos would have much effect, but Sol certainly would.

Something else I've wondered about: there's gotta be some research on the effects of lower air pressure on the ability of water to take up CO2 from the atmosphere. And on the ability of disolved CO2 to form carbonates. I would guess that below a certain pressure there would be no mixing at all, making carbonates impossible to form on mars, water or no.