期刊
GEOPHYSICAL RESEARCH LETTERS
卷 40, 期 21, 页码 5605-5609出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2013GL057763
关键词
planetary atmospheres; argon isotopes; solar system; Mars; habitability; atmospheric loss
资金
- NASA Mars Science Laboratory Project
The quadrupole mass spectrometer of the Sample Analysis at Mars (SAM) instrument on Curiosity rover has made the first high-precision measurement of the nonradiogenic argon isotope ratio in the atmosphere of Mars. The resulting value of Ar-36/Ar-38=4.20.1 is highly significant for it provides excellent evidence that Mars meteorites are indeed of Martian origin, and it points to a significant loss of argon of at least 50% and perhaps as high as 85-95% from the atmosphere of Mars in the past 4 billion years. Taken together with the isotopic fractionations in N, C, H, and O measured by SAM, these results imply a substantial loss of atmosphere from Mars in the posthydrodynamic escape phase.
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