Schauble, Edwin A. and Eiler, John M. and Kitchen, Nami (2003) Measurement and significance of ^(13)C^(18)O^(16)O in thermodynamically equilibrated and environmental CO_2. Geochimica et Cosmochimica Acta, 67 (18). A419-A419. ISSN 0016-7037. doi:10.1016/S0016-7037(03)00513-1. https://resolver.caltech.edu/CaltechAUTHORS:20130715-160353090
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Abstract
Precise measurements of the abundances of mass 44 45 46, and 47 CO_2 molecules have led to the discovery of non- random mixing of the stable isotopes of carbon and oxygen in CO_2 extracted from ambient air as well as CO_2 equilibrated with H2_O in the laboratory. Mass-47 excesses (dominantly ^(13)C^(16)O^(18)O) of ca. 1‰ are evident in samples that have experienced isotope exchange at low temperatures (i.e., human breath, CO_2 residual of photosynthesis, CO_2 equilibrated with liquid H_2O), relative to samples exchanged at higher temperatures (hydrocarbon combustion products, CO_2 heated to 1000°C). These results agree with theoretical calculations of equilibrium isotopic mixing, suggesting that mass-47 CO_2 may gauge the relative importance of high-temperature and low-temperature sources to atmospheric CO_2. CO_2 from ambient air is intermediate between the high-T and low-T extremes.
| Item Type: | Article | |||||||||
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| Additional Information: | © 2003 Published by Elsevier Ltd. | |||||||||
| Issue or Number: | 18 | |||||||||
| DOI: | 10.1016/S0016-7037(03)00513-1 | |||||||||
| Record Number: | CaltechAUTHORS:20130715-160353090 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20130715-160353090 | |||||||||
| Official Citation: | Abstracts, Geochimica et Cosmochimica Acta, Volume 67, Issue 18, Supplement, September 2003, Pages 401-450, ISSN 0016-7037, http://dx.doi.org/10.1016/S0016-7037(03)00513-1. | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 39374 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Tony Diaz | |||||||||
| Deposited On: | 19 Aug 2013 22:00 | |||||||||
| Last Modified: | 09 Nov 2021 23:44 |
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