Mars is losing water more quickly than theory and observations would suggest. The gradual disappearance of water (H2O) occurs in the upper atmosphere of Mars as sunlight and chemistry disassociate water molecules into hydrogen and oxygen atoms that the weak gravity cannot prevent from escaping into space.
CNRS


© ESA | Water could disappear from Mars faster than expected
An international research team, led partly by CNRS researcher Franck Montmessin, has just revealed that water vapor is accumulating in large quantities and unexpected proportions at an altitude of over 80 km in the Martian atmosphere. Measurements showed that large atmospheric pockets are even in a state of supersaturation, with the atmosphere containing 10 to 100 times more water vapor than its temperature should theoretically allow. With the observed supersaturation rates, the capacity of water to escape would greatly increase during certain seasons.
These results, which were published in Science on 9 January 2020, were obtained thanks to the Trace Gas Orbiter probe from the ExoMars mission, financed by the European Space Agency and the Russian space agency Roscosmos.

This article was originally published by CNRS. 
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