Researchers from the USA, India and Italy have studied images taken by the Mars Curiosity Rover and found them on the organisms, like fungi and lichens.
Their model suggests the release may have come from Aeolis Mensae, a geological feature some 300 miles east of Gale Crater.
In the meantime, the worldwide team led by Italian researcher Marco Giuranna had succeeded in improving the quality of the data collected by the Mars Express infrared spectrometer, a mission of the European Space Agency (ESA).
For many years, there has been a great debate over the possibility of methane on Mars.
The science world jumped back in 2013 when NASA's Curiosity apparently detected traces of methane on the red planet.
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The scientists led by Dr Marco Giuranna, from the National Institute of Astrophysics in Rome, wrote: "The results presented in this work not only corroborate previous detections by Curiosity but, in a broader perspective, might change our view of methane occurrence on Mars".
Methane is only supposed to have a very short lifetime in the Martian atmosphere, so detecting it there means it must have been released very recently. NASA Curiosity rover detected the methane emission from the Gale Crater within 24 hours of the space probe. The Mars Express probe measured 15.5 parts per billion in the atmosphere above the crater.
Giuranna said that while methane is a sign of life on Earth, its presence on Mars doesn't necessarily constitute evidence of something similar on the Red Planet. "Let's just say it will make for an interesting discussion in the community as we seek to resolve the observations from existing and new measurements of methane on Mars".
At the time of the Curiosity detection, it was speculated that the methane originated north of the rover, because the prevailing winds were southward, and that the release likely occurred inside the crater. The location, known as Aeolis Mensae, has a number of geological faults that may have fractured nearby permafrost and released any methane trapped inside.
"Our results support the idea that methane release on Mars might be characterized by small, transient geological events rather than a constantly replenishing global presence, but we also need to understand better how methane is removed from the atmosphere, and how to reconcile the Mars Express data with results from other missions", adds co-author Frank Daerden from the Royal Belgian Institute for Space Aeronomy in Brussels.
Shortly after Curiosity landed in 2012 in the Gale impact crater, "I made a decision to conduct a long-term monitoring of the Martian atmosphere" at this location, says the researcher, whose study is published in Nature Geoscience.