• Medientyp: E-Artikel
  • Titel: Primordial argon isotope fractionation in the atmosphere of Mars measured by the SAM instrument on Curiosity and implications for atmospheric loss
  • Beteiligte: Atreya, Sushil K.; Trainer, Melissa G.; Franz, Heather B.; Wong, Michael H.; Manning, Heidi L. K.; Malespin, Charles A.; Mahaffy, Paul R.; Conrad, Pamela G.; Brunner, Anna E.; Leshin, Laurie A.; Jones, John H.; Webster, Christopher R.; Owen, Tobias C.; Pepin, Robert O.; Navarro‐González, R.
  • Erschienen: American Geophysical Union (AGU), 2013
  • Erschienen in: Geophysical Research Letters
  • Sprache: Englisch
  • DOI: 10.1002/2013gl057763
  • ISSN: 1944-8007; 0094-8276
  • Schlagwörter: General Earth and Planetary Sciences ; Geophysics
  • Entstehung:
  • Anmerkungen:
  • Beschreibung: <jats:p>The quadrupole mass spectrometer of the Sample Analysis at Mars (SAM) instrument on <jats:italic>Curiosity</jats:italic> rover has made the first high‐precision measurement of the nonradiogenic argon isotope ratio in the atmosphere of Mars. The resulting value of <jats:sup>36</jats:sup>Ar/<jats:sup>38</jats:sup>Ar = 4.2 ± 0.1 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.</jats:p>
  • Zugangsstatus: Freier Zugang