Imagine if all the water of the Earth's Oceans were added instantaneously to the Martian surface. What wouldhappen in 10 mins? In 10 years? In 1000 years? In 1 billion years?
Would life form?
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Water added to mars would freeze over and sublimate into the thin air. What this new equilibreium atmosphere does to the temperature would probably be greenhouse-like, but the ice surface would have a cooling effect as sublight is reflected.
Water and gasses in general are lost from Mars over geologic time scales. But that is a significant depth of water to get rid of, so I suppose it will stay like that for a billion years or so.