After the deluge, Mars would most likely cool off in a relatively quick manner of 1,000 to 100,000 years, causing the water to freeze over.
Then over the course of millions of years, intense radiation from the Sun would vaporise the ice again and release it into the atmosphere.
The study reads: “The origin of the presence of geological and mineralogical evidence that liquid water flowed on the surface of early Mars is now a 50-year-old mystery.
“It has been proposed that bolide impacts could have triggered a long-term climate change, producing precipitation and runoff that may have altered the surface of Mars in a way that could explain, at least part of, this evidence.
“Here we use a hierarchy of numerical models to test that hypothesis and more generally explore the environmental effects of very large bolide impacts on the atmosphere, surface and interior of early Mars.”