JUN 03, 2022 7:45 AM PDT

Mysteries of Martian Climate Revealed: Could They Solve Problems on Earth?

One of the major reasons why Mars is such a popular object to study in our Solar System is because scientists believe that it may have looked much different millions of years ago. There exists evidence that Mars may have once been similar to Earth, with oceans, lakes, and rivers galore. How then did Mars become this barren, dry wasteland? Global warming and climate change. If scientists can understand how the climate of Mars evolved and changed, then maybe they can prevent a similar future on Earth.

Scientists led by a team at the University of Houston are studying the traces of climate change that occurred on Mars long ago to help other scientists understand climate issues on Earth. The team presented a global picture of the climate of Mars in the Proceedings of the National Academy of Sciences.

Making use of observations from Martian satellites, landers, and rovers (e.g., NASA’s Mars Global Surveyor, Curiosity Rover, and InSight), the team estimated the emitted energy of Mars as a function of season. They found that the radiant energy budget – the measure of solar energy a planet takes in from the Sun and then releases as heat – is imbalanced, and varies diurnally and seasonally. The radiant energy budget is a fundamental metric of a planet and could play an important role in understanding the climate and atmosphere of Mars. Current climate models assume that Mars’ radiant energy is balanced between seasons, meaning that any conclusions derived from these models are incorrect.

The team found a strong energy imbalance – more energy is being absorbed by the planet than is being produced by the planet – of approximately 15.3% between seasons. This is much larger than the energy imbalance of other worlds (e.g., Earth – 0.4% or Titan – 2.9%). Our home, the Earth, has an almost circular orbit around the Sun, which means the Earth is almost exactly the same distance from the Sun at all times of the year. Unlike Earth, Mars has an extremely elliptical orbit, and also unlike Earth, Mars does not have much of an atmosphere. These two factors make Mars susceptible to extreme temperature variations. The “seasons” of Mars occur when it is closer and further from the Sun – meaning the reasons for the “seasons” on Mars are much different than the reasons for seasons on Earth. When Mars gets closer to the Sun, it absorbs extreme amounts of heat – or energy – from the Sun, and when Mars gets further from the Sun in its orbit, it absorbs less heat.

The times when Mars is closer to the Sun also happens to be when global dust storms occur on its surface. The team believes that the seasonal energy imbalances are the driving forces behind these global dust storms. During a global dust storm in 2001, the global-average emitted power decreased by 22% during the daytime, and increased 29% during the nighttime. Perhaps the energy went into generating the global dust storms that plague Mars!

These are two images obtained by NASA's Curiosity Rover, standing inside Gale Crater, taken 3 days apart. The images show how dust in the atmosphere has increased from a major Martian dust storm. Credit: NASA/JPL/MSSS

These results, in combination with numerical global climate models, could help to improve our current understanding of the Martian climate and atmosphere. Additionally, understanding the driving forces behind Martian dust storms could help climate scientists understand what causes severe storms – a sign of climate change – on Earth. So, perhaps lessons from the history and evolution of the climate of Mars can help us solve our own climate troubles on Earth.

 

Sources: University of Houston, Universities Space Research Association

About the Author
PhD in Astrophysics
I'm a stellar astrophysicist by training with a passion for formal and informal education and diversity and inclusion in STEM. I love to take a humanistic approach to my work and firmly believe that all of humanity is united under one sky.
You May Also Like
MAY 11, 2022
Space & Astronomy
Experience a Total Lunar Eclipse Over the Evening of Sunday, May 15th
MAY 11, 2022
Experience a Total Lunar Eclipse Over the Evening of Sunday, May 15th
For the first time in almost a full year, residents of Earth will be able to observe a total lunar eclipse – a per ...
JUN 09, 2022
Space & Astronomy
Telescope on Plane to Study Evolution of Molecules in the Milky Way
JUN 09, 2022
Telescope on Plane to Study Evolution of Molecules in the Milky Way
Hydrides in the Galaxy (HyGAL) is a project whose goal is to characterize the interstellar medium in the Milky Way in or ...
JUN 30, 2022
Chemistry & Physics
Discovery of the Fastest Nova Yet
JUN 30, 2022
Discovery of the Fastest Nova Yet
A Nova aka a New Star is a sudden outburst on the surface of a white dwarf (remnant of a dead star) when it pulls enough ...
JUL 23, 2022
Space & Astronomy
Spiraled Planet-Forming Disk Found Near Galactic Center
JUL 23, 2022
Spiraled Planet-Forming Disk Found Near Galactic Center
In a recent study published in Nature Astronomy, a team of astronomers have observed a massive young star near the cente ...
JUL 30, 2022
Space & Astronomy
A New Method to Detect Exoplanets
JUL 30, 2022
A New Method to Detect Exoplanets
There have been thousands of exoplanets found orbiting around single – or ‘normal’ – stars, but ...
AUG 09, 2022
Space & Astronomy
The Square Kilometer Array: Soon to be the World's Biggest Radio Telescope
AUG 09, 2022
The Square Kilometer Array: Soon to be the World's Biggest Radio Telescope
The Square Kilometer Array Observatory (SKAO) will soon be the largest radio telescope in the world. Construction on the ...
Loading Comments...