期刊
SCIENCE
卷 306, 期 5702, 页码 1758-1761出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1101732
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We report a detection of methane in the martian atmosphere by the Planetary Fourier Spectrometer onboard the Mars Express spacecraft. The global average methane mixing ratio is found to be 10+/-5 parts per billion by volume (ppbv). However, the mixing ratio varies between 0 and 30 ppbv over the planet. The source of methane could be either biogenic or nonbiogenic, including past or present subsurface microorganisms, hydrothermal activity, or cometary impacts.
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