‘Curiosity’ exposes low CO2 level in Mars’ primitive atmosphere

The CO2 level in Mars’ primitive atmosphere 3.5 billion years ago was too low for sediments, such as those found, to be deposited. This and other conclusions are drawn from a paper written with the participation of researchers according to Science daily.

The area Curiosity has been analysing since 2012 is composed primarily of sedimentary sequences deposited at the bottom of a lake 3.5 billion years ago. These sediments contain various secondary minerals, such as clays or sulphates, which indicate that the primitive surface was in contact with liquid water.

 The existence of liquid water requires a warm surface temperature brought about by a minimum content of CO2 in the atmosphere. Yet this was not the case with Mars in its beginnings. “This contradiction has two possible solutions. Either we have not yet developed climatic models which explain the environmental conditions on Mars at the beginning of its history, or the Gale sedimentary sequences really did form in a very cold climate,” explains researcher Alberto Fairén.

A very cold environment

“However, the rover has not found carbonates, thereby confirming the results of studies by all previous probes: carbonates are very scarce on the surface of Mars and, therefore, the CO2 level in the atmosphere was very low,” adds. Fairén.

Specifically, the direct analysis of samples on the surface of Mars carried out by these researchers’ shows that the level of CO2 in the atmosphere at the time the Gale Crater sediments were deposited was between 10 and 100 times less than the minimum required for the surface temperature to be above the freezing point of the liquid water.

On Earth, carbonate deposits form on lake and sea beds when CO2 in the atmosphere interacts with liquid water. Carbon dioxide is a gas capable of generating a powerful ‘greenhouse effect’ and, therefore, of heating the planet.

According to the scientists, an image that maybe would describe Gale in the early days of Mars would be that of a glacial lake, surrounded by huge masses of ice, which would be partially or seasonally frozen. “The environment would have been similar to the Canadian Arctic or to Greenland today,” says the researcher.

In addition, although ice would have dominated, it would also have been common to find liquid water present in abundance. The formation of clays and sulphates would have occurred at specific places and times, seasonally, or under an ice cap in liquid water lakes.

N.H.Kh

You might also like
Latest news
Zionist drone kills several Palestinian people in Al-Bureij refugee camp Syrian researcher comes in 2nd place in the Arab League Award for Law and Judiciary World Education Meeting 2024 asserts the importance of investing in education Zionist occupation killed over 43,314 Palestinian citizens since October 2023 UNESCO:  the number of journalists killed while working leaped 38% in 2022-23 Olive harvest in Hama estimated at  90,000 tons Zionist occupation detained 20 Palestinians from the West Bank over the past 24 hours Lavrov: The more the Kiev regime violates agreements, the less territory Ukraine has left Khamenei: Enemies will receive a jaw-breaking response for what they are doing against Iran and Resi... Lebanese resistance launched missile attack on the “Glilot” base and settlements in northern occupie... Pyongyang: The DPRK will further intensify its practical efforts to deter the military threat of the... China evacuated 282,000 people ahead of the Typhoon Kong-rey Zionist enemy committed 10 bloody massacres in south Lebanon yesterday Zionist occupation killed several Palestinian citizens in central Gaza Strip PA issues a statement on the 107th anniversary of the ill-fated Balfour Declaration Al-Mardini discusses with ALECSO’s director and Russian delegation educational cooperation World Health Organization Expresses Concern Over Israeli Attacks on Lebanese Health Facilities On the Second Day of the World Education Meeting... Minister of Education Presents an Intervention o... 9 Settlers Injured as a Result of the Lebanese Resistance Targeting Several Settlements in Northern ... The UN Warns of the Danger of Israeli Raids on Archaeological Sites in Lebanon