Mars` atmosphere thinning but still active
Washington: Recent findings from NASA’s Mars rover Curiosity indicate Mars has lost much of its original atmosphere, but what’s left remains quite active.
Evidence has strengthened this month that Mars lost much of its original atmosphere by a process of gas escaping from the top of the atmosphere.
Curiosity’s Sample Analysis at Mars (SAM) instrument analyzed an atmosphere sample last week using a process that concentrates selected gases. The results provided the most precise measurements ever made of isotopes of argon in the Martian atmosphere. Isotopes are variants of the same element with different atomic weights.
“We found arguably the clearest and most robust signature of atmospheric loss on Mars,” said Sushil Atreya, a SAM co-investigator at the University of Michigan, Ann Arbor.
SAM found that the Martian atmosphere has about four times as much of a lighter stable isotope (argon-36) compared to a heavier one (argon-38). This removes previous uncertainty about the ratio in the Martian atmosphere from 1976 measurements from NASA’s Viking project and from small volumes of argon extracted from Martian meteorites.
The ratio is much lower than the solar system’s original ratio, as estimated from argon-isotope measurements of the Sun and Jupiter. This points to a process at Mars that favoured preferential loss of the lighter isotope over the heavier one.
Curiosity measures several variables in today’s Martian atmosphere with the Rover Environmental Monitoring Station (REMS), provided by Spain. While daily air temperature has climbed steadily since the measurements began eight months ago and is not strongly tied to the rover’s location, humidity has differed significantly at different places along the rover’s route. These are the first systematic measurements of humidity on Mars.
Trails of dust devils have not been seen inside Gale Crater, but REMS sensors detected many whirlwind patterns during the first hundred Martian days of the mission, though not as many as detected in the same length of time by earlier missions.
“A whirlwind is a very quick event that happens in a few seconds and should be verified by a combination of pressure, temperature and wind oscillations and, in some cases, a decrease is ultraviolet radiation,” said REMS Principal Investigator Javier Gomez-Elvira of the Centro de Astrobiologia, Madrid.
Dust distributed by the wind has been examined by Curiosity’s laser-firing Chemistry and Camera (ChemCam) instrument. Initial laser pulses on each target hit dust. The laser’s energy removes the dust to expose underlying material, but those initial pulses also provide information about the dust.
“We knew that Mars is red because of iron oxides in the dust,” said ChemCam Deputy Principal Investigator Sylvestre Maurice of the Institut de Recherche en Astrophysique et Planétologie in Toulouse, France.
“ChemCam reveals a complex chemical composition of the dust that includes hydrogen, which could be in the form of hydroxyl groups or water molecules,” the scientist stated.
For the rest of April, Curiosity will carry out daily activities for which commands were sent in March, using DAN, REMS and the Radiation Assessment Detector (RAD).
Rover team members reported their diverse findings at the European Geosciences Union 2013 General Assembly, in Vienna.
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