Mars' atmospheric history derived from upper-atmosphere measurements of 38Ar/36Ar

B. M. Jakosky, M. Slipski, M. Benna, P. Mahaffy, M. Elrod, Roger Yelle, S. Stone, N. Alsaeed

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

The history of Mars' atmosphere is important for understanding the geological evolution and potential habitability of the planet.We determine the amount of gas lost to space through time using measurements of the upper-atmospheric structure made by the Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft.We derive the structure of 38Ar/36Ar between the homopause and exobase altitudes. Fractionation of argon occurs as a result of loss of gas to space by pickup-ion sputtering, which preferentially removes the lighter atom.The measurements require that 66% of the atmospheric argon has been lost to space.Thus, a large fraction of Mars' atmospheric gas has been lost to space, contributing to the transition in climate from an early, warm, wet environment to today's cold, dry atmosphere.

Original languageEnglish (US)
Article numberaai7721
JournalScience
Volume355
Issue number6332
DOIs
StatePublished - Mar 31 2017

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Mars
Atmosphere
Argon
Gases
History
Spacecraft
Planets
Climate
Ions

ASJC Scopus subject areas

  • Medicine(all)
  • General

Cite this

Jakosky, B. M., Slipski, M., Benna, M., Mahaffy, P., Elrod, M., Yelle, R., ... Alsaeed, N. (2017). Mars' atmospheric history derived from upper-atmosphere measurements of 38Ar/36Ar. Science, 355(6332), [aai7721]. https://doi.org/10.1126/science.aai7721

Mars' atmospheric history derived from upper-atmosphere measurements of 38Ar/36Ar. / Jakosky, B. M.; Slipski, M.; Benna, M.; Mahaffy, P.; Elrod, M.; Yelle, Roger; Stone, S.; Alsaeed, N.

In: Science, Vol. 355, No. 6332, aai7721, 31.03.2017.

Research output: Contribution to journalArticle

Jakosky, BM, Slipski, M, Benna, M, Mahaffy, P, Elrod, M, Yelle, R, Stone, S & Alsaeed, N 2017, 'Mars' atmospheric history derived from upper-atmosphere measurements of 38Ar/36Ar', Science, vol. 355, no. 6332, aai7721. https://doi.org/10.1126/science.aai7721
Jakosky BM, Slipski M, Benna M, Mahaffy P, Elrod M, Yelle R et al. Mars' atmospheric history derived from upper-atmosphere measurements of 38Ar/36Ar. Science. 2017 Mar 31;355(6332). aai7721. https://doi.org/10.1126/science.aai7721
Jakosky, B. M. ; Slipski, M. ; Benna, M. ; Mahaffy, P. ; Elrod, M. ; Yelle, Roger ; Stone, S. ; Alsaeed, N. / Mars' atmospheric history derived from upper-atmosphere measurements of 38Ar/36Ar. In: Science. 2017 ; Vol. 355, No. 6332.
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