Nier, Alfred O. and McElroy, Michael B. and Yung, Yuk Ling (1976) Isotopic Composition of the Martian Atmosphere. Science, 194 (4260). pp. 68-70. ISSN 0036-8075. doi:10.1126/science.194.4260.68. https://resolver.caltech.edu/CaltechAUTHORS:20140721-141309854
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Abstract
Results from the neutral mass spectrometer carried on the aeroshell of Viking 1 show evidence for NO in the upper atmosphere of Mars and indicate that the isotopic composition of carbon and oxygen is similar to that of Earth. Mars is enriched in ^(15)N relative to Earth by about 75 percent, a consequence of escape that implies an initial abundance of nitrogen equivalent to a partial pressure of at least 2 millibars. The initial abundance of oxygen present either as CO_2 or H_2O must be equivalent to an exchangeable atmospheric pressure of at least 2 bars in order to inhibit escape-related enrichment of ^(18)O.
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| Additional Information: | © 1976 American Association for the Advancement of Science. Received 2 September 1976. Work at the University of Minnesota and at Harvard University was supported by NASA under contracts NAS-1-9697 and NAS-1-10492, respectively. A.O.N. is indebted to Ward Johnson for help in making computations. | ||||||||||||
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| Issue or Number: | 4260 | ||||||||||||
| DOI: | 10.1126/science.194.4260.68 | ||||||||||||
| Record Number: | CaltechAUTHORS:20140721-141309854 | ||||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140721-141309854 | ||||||||||||
| Official Citation: | Isotopic Composition of the Martian Atmosphere Alfred O. Nier, Michael B. McElroy and Yuk Ling Yung Science, New Series, Vol. 194, No. 4260 (Oct. 1, 1976), pp. 68-70 Published by: American Association for the Advancement of Science Article Stable URL: http://www.jstor.org/stable/1742562 | ||||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||
| ID Code: | 47371 | ||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||
| Deposited By: | Tony Diaz | ||||||||||||
| Deposited On: | 21 Jul 2014 21:42 | ||||||||||||
| Last Modified: | 10 Nov 2021 17:38 |
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