The team of the planetary researcher led by Caltech has decided on a chemical mechanism that can maintain sufficient warmth in the early days of ancient Mars, perhaps to host life.
Adams et al。 Mars has experienced a temporary warm period for the 40 million years of integration, estimating that each event lasted about 100 to 00 years. Image credit: M. Kornmesser / ESO / N. risinger, Skysurvey.org.
“Because Mars is far from the sun, it was a very puzzle that Mars had liquid water on Mars. Dr. Adams said.
“Hydrogen was previously theoretical as a magical component, mixed with carbon dioxide in Mars, causing an episode of greenhouse warming.”
“However, the life of air hydrogen was short, so a more detailed analysis was needed.”
In this study, Dr. Adams and his colleagues used photochemical modeling to describe the details of the relationship with hydrogen in the early atmosphere of Mars and how the relationship has changed over time.
“The early Mars is a lost world, but if you ask the right question, you can reconstruct in detail,” said Professor Robin Wordworth at Harvard University.
“In this study, we will integrate the atmosphere and climate of the atmosphere for the first time and bring some impressive new predictions that can be tested if you bring back Mars to Earth.”
The authors changed the model called dynamics to simulate how the combination of hydrogen and other gas, which responded to both the ground and air, reacted the early Mars climate.
They discovered that Mars has been a warm episode of about 40 million years, 400 million to 3 billion years ago during the Noatian and Hesperian days in Mars, and that each event lasted more than 10000 years.
These estimated values ​​match today's geological characteristics of Mars.
During the warm and damp period, the hydrogen of the crust or the lost water on the ground was driven, and sufficient hydrogen was supplied to accumulate in the atmosphere for millions of years.
During the fluctuations between the warm climate and the cold climate, the chemistry of the atmosphere of Mars also fluctuated. Carbon dioxide is constantly attacked by sunlight and is converted to carbon monoxide.
During the warm period, carbon dioxide can return to carbon dioxide and control carbon dioxide and hydrogen.
However, if it is long enough, the recycling decelerates, accumulates carbon monoxide, and reduces the reduction, that is, less oxygen.
Therefore, the red oxidation state of the atmosphere changed dramatically over time.
“We have identified all of these alternate time scale,” said Dr. Adams.
“And I explained all the same parts of the same photochemical model.”
Modeling work gives a potential new insight into the conditions for supporting the pre -buiotics chemistry (the basis of life after we know), and to the end of its life at intervals between cold and oxidation. Lends issues.
Researchers are working to find evidence of these alternatives using isotopic chemical modeling.
They will compare these results with the rocks of the Mars Sample Return Mission in the future.
Since Mars has no plate tectonics, unlike the earth, the surface seen today resembles the surface long ago, making the history of lakes and rivers more interesting.
“It will be a really wonderful case study for how the planet evolves over time,” said Dr. Adams.
study Published in the journal Natural global science。
______
D. Adams et al。 The warm climate of the early episode on Mars prepared by hydration of the crust. nut. GeosciReleased online on January 15, 2025. Doi: 10.1038/S41561-024-01626-8
Source: www.sci.news
