30% to 99% of the water that covers the red planet is rivers and oceans millions of years ago, it was absorbed into the minerals in its shell, and it did not evaporate. This was reflected in the new data and simulations presented at this week’s “Moon and Planetary Science Conference.”
Mars What we know today is not always cold, reddish and arid planets. In the past, the temperature and humidity were much higher here, as can be seen from the beds. Arid river and its ruined coast. There was a period of time when a large amount of liquid water flowed across its surface, although today there is almost no residue, and most of it is frozen in the polar cap.
So far, various studies have pointed out that ancient water on Mars has escaped into space for billions of years. This claim is supported by the observed relationship between its atmosphere and its atmosphere. Hydrogen (H) And one of its isotopes, Deuterium (D).
However, the current measurement of atmospheric water loss rate is too low to account for all its losses alone. A new study shows that geological causes seem to be the cause. Lunar Planetary Science Conference (LPSC), these days are actually celebrated and published in the magazine science.
Researcher Eva Scheller The California Institute of Technology (Caltech) and other colleagues from the Institute and the JPL Laboratory report that as much as 99% of the original water on Mars can be incorporated into the minerals in its crust, and that this water has not been lost in space. .
Using observational data from spacecraft orbiting the red planet and data from Earth Wanderer In the process of traversing the surface and Martian meteorites, the author calculated the amount of water in the past and considered its current ratio, water, volcanic degassing, and the hydration of the crust through chemical weathering.
The water sources and sinks of various geological periods on Mars are considered in the simulation. / E. Scheller et al. / Science
The research team found that about 4 billion years ago, Mars had enough water to cover the entire earth. 100 to 1500 meters deep ocean, Its volume is equivalent to half of the Earth’s Atlantic Ocean.
However, when simulating the loss of Martian water under different possible conditions throughout the geological period, the results of the model concluded: “The amount of water involved in the hydrological cycle has decreased. 40% to 95% During the empty period of Mars (410 to 3.7 billion years ago).
The researchers added that “30% to 99% of Martian water is hydrated by the earth’s crust and is isolated, indicating that irreversible chemical weathering will increase the drought on the planet Earth.”
Therefore, the results showed that a large amount of initial water from Mars was incorporated into minerals and buried in the crust of the red planet, while the rest escaped into space, which could explain the recorded D/H ratio. Currently in your atmosphere.
E. Scherer et al. “By isolating the massive amount of water in the shell, Mars can be dried for a long time.” science, 2021.