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Isotope Ratios of H, C, and O in CO 2 and H 2 O of the Martian Atmosphere
Abstract
Mars' Atmosphere from Curiosity: The Sample Analysis at Mars (SAM) instrument on the Curiosity rover that landed on Mars in August last year is designed to study the chemical and isotopic composition of the martian atmosphere. Mahaffy et al. (p. 263 ) present volume-mixing ratios of Mars' five major atmospheric constituents (CO 2 , Ar, N 2 , O 2 , and CO) and isotope measurements of 40 Ar/ 36 Ar and C and O in CO 2 , based on data from one of SAM's instruments, obtained between 31 August and 21 November 2012. Webster et al. (p. 260 ) used data from another of SAM's instruments obtained around the same period to determine isotope ratios of H, C, and O in atmospheric CO 2 and H 2 O. Agreement between the isotopic ratios measured by SAM with those of martian meteorites, measured in laboratories on Earth, confirms the origin of these meteorites and implies that the current atmospheric reservoirs of CO 2 and H 2 O were largely established after the period of early atmospheric loss some 4 billion years ago.
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“…oxidising surface conditions and minimal weathering; the Hesperian (∼ 3.0−3.5 Ga), which contains evidence of extensive volcanism and catastrophic flooding, and the ancient Noachian (∼ 3.5−4.1 Ga), when alteration of the Martian surface by water was greatest [Werner & Tanaka (2011); also see Fig.”
BackgroundMethodInfluential
Metadata
- Authors
- Webster, C. R., Mahaffy, P. R., Flesch, G. J., Niles, P. B., Jones, J. H., Leshin, L. A., Atreya, S. K., Stern, J. C., Christensen, L. E., Owen, T., Franz, H., Pepin, R. O., Steele, A., & the MSL Science Team
- Venue
- Science
- Published
- 2013-07-19
- Volume
- 341
- Issue
- 6143
- Pages
- 260-263
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2087733966
- Cited by
- 295
- References
- 34
- FWCI
- 15.50
- Type
- journal article
- Language
- en
- Open access
- closed
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