24 January 2017
Findings may help in search for life in the universe
By Leah Burrows
The presence of water on ancient Mars is a paradox. There’s plenty of geographical evidence that rivers periodically flowed across the planet’s surface. Yet in the time period when these waters are supposed to have run — three to four billion years ago — Mars should have been too cold to support liquid water.
So how did it stay so warm?
In a new study, researchers suggest early Mars may have been warmed intermittently by a powerful greenhouse effect. In a paper published in Geophysical Research Letters, a journal of the American Geophysical Union, researchers found interactions between methane, carbon dioxide and hydrogen in the early Martian atmosphere may have created warm periods when the planet could support liquid water on the surface.
“Early Mars is unique in the sense that it’s the one planetary environment, outside Earth, where we can say with confidence that there were at least episodic periods where life could have flourished,” said Robin Wordsworth, a planetary climate scientist at Harvard’s John A. Paulson School of Engineering and Applied Science (SEAS) in Cambridge, Massachusetts and lead author of the new study. “If we understand how early Mars operated, it could tell us something about the potential for finding life on other planets outside the solar system.”
Four billion years ago, the sun was about 30 percent fainter than today and significantly less solar radiation — a.k.a. heat — reached the Martian surface. The scant radiation that did reach the planet was trapped by the atmosphere, resulting in warm, wet periods. For decades, researchers have struggled to model exactly how the planet was insulated.
The obvious culprit is carbon dioxide. Carbon dioxide makes up 95 percent of today’s Martian atmosphere and is the most well-known and abundant greenhouse gas on Earth. But carbon dioxide alone does not account for Mars’ early temperatures, according to Wordsworth.
“You can do climate calculations where you add carbon dioxide and build up to hundreds of times the present day atmospheric pressure on Mars and you still never get to temperatures that are even close to the melting point,” she said.
There must have been something else in Mars’ atmosphere that contributed to a greenhouse effect. The atmospheres of rocky planets lose lighter gases, such as hydrogen, to space over time. In fact, the oxidation that gives Mars its distinctive hue is a direct result of the loss of hydrogen.
Wordsworth and his collaborators looked to these long-lost gases, known as reducing gases, to provide a possible explanation for Mars’ early climate. In particular, the team looked at methane, which today is not abundant in the Martian atmosphere. Billions of years ago, however, geological processes could have been releasing significantly more methane into the atmosphere. This methane would have been slowly converted to hydrogen and other gases, in a process similar to that occurring today on Saturn’s moon, Titan.
To understand how this early Martian atmosphere may have behaved, the team needed to understand the fundamental properties of these molecules.
“When you’re looking at exotic atmospheres, you can’t compare them to Earth’s atmosphere,” Wordsworth said. “You have to start from first principles. So we looked at what happens when methane, hydrogen and carbon dioxide collide and how they interact with photons. We found that this combination results in very strong absorption of radiation.”
Carl Sagan first speculated that hydrogen warming could have been important on early Mars back in 1977, but this is the first time scientists have been able to calculate its greenhouse effect accurately. It is also the first time that methane has been shown to be an effective greenhouse gas on early Mars, according to the study’s authors.
“This research shows that the warming effects of both methane and hydrogen have been underestimated by a significant amount,” Wordsworth said. “We discovered that methane and hydrogen, and their interaction with carbon dioxide, were much better at warming early Mars than had previously been believed.”
The researchers hope that future missions to Mars will shed light on the geological processes that produced methane billions of years ago.
“One of the reasons early Mars is so fascinating is that life needs complex chemistry to emerge,” said Wordsworth. “These episodes of reducing gas emission followed by planetary oxidation could have created favorable conditions for life on Mars.”
—Leah Burrows is a science and technology communications officer at SEAS. This post originally appeared as a press release on the SEAS website.