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Measurement and significance of ^(13)C^(18)O^(16)O in thermodynamically equilibrated and environmental CO_2

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.

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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.

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Additional Information:© 2003 Published by Elsevier Ltd.
Issue or Number:18
Record Number:CaltechAUTHORS:20130715-160353090
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Official Citation:Abstracts, Geochimica et Cosmochimica Acta, Volume 67, Issue 18, Supplement, September 2003, Pages 401-450, ISSN 0016-7037,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39374
Deposited By: Tony Diaz
Deposited On:19 Aug 2013 22:00
Last Modified:09 Nov 2021 23:44

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