Oceans vital to finding alien life

Oceans are key to Earth-like life evolving on other planets, a new study has found.
Oceans help to make a planet's climate more stable so factoring them into climate models is vital for knowing whether the planet could develop and sustain life.
New research at the University of East Anglia shows the vital role of oceans in moderating climate on Earth-like planets.
Until now, computer simulations of habitable climates on Earth-like planets have focused on their atmospheres. But the presence of oceans is vital for optimal climate stability and habitability, researchers said.
Researchers created a computer simulated pattern of ocean circulation on a hypothetical ocean-covered Earth-like planet.

They looked at how different planetary rotation rates would impact heat transport with the presence of oceans taken into account.

"The number of planets being discovered outside our solar system is rapidly increasing. This research will help answer whether or not these planets could sustain alien life," Professor David Stevens from UEA's school of Mathematics said.
"We know that many planets are completely uninhabitable because they are either too close or too far from their sun. A planet's habitable zone is based on its distance from the sun and temperatures at which it is possible for the planet to have liquid water.

"But until now, most habitability models have neglected the impact of oceans on climate," said Stevens.
"Oceans have an immense capacity to control climate. They are beneficial because they cause the surface temperature to respond very slowly to seasonal changes in solar heating. And they help ensure that temperature swings across a planet are kept to tolerable levels.
"We found that heat transported by oceans would have a major impact on the temperature distribution across a planet, and would potentially allow a greater area of a planet to be habitable," Stevens said.
"Mars for example is in the Sun's habitable zone, but it has no oceans - causing air temperatures to swing over a range of 100O degrees Celsius. Oceans help to make a planet's climate more stable so factoring them into climate models is vital for knowing whether the planet could develop and sustain life.

"This new model will help us to understand what the climates of other planets might be like with more accurate detail than ever before," he said.
The study was published in the journal Astrobiology.