Siegenthaler, U.; Friedli, H.; Loetscher, H.; Moor, E.; Neftel, A.; Oeschger, H.; Stauffer, B. (1988). Stable-isotope ratios and concentration of CO2 in air from polar ice cores. Annals of glaciology, 10, pp. 151-156. International Glaciological Society 10.3189/S0260305500004341
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Analyses of air trapped in an ice core from the South Pole indicate that the CO2 concentration may have increased by about 10 ppm and that the 13C/12C ratio decreased slightly in the thirteenth century. These changes, if really of atmospheric origin, must be due to a significant input into the atmosphere of CO2, either of biogenic or of oceanic origin.
18O/16O ratios in CO2 from different ice cores are much lower than those which have been observed in atmospheric carbon dioxide. A possible explanation is that the CO2 has equilibrated isotopically with the ice. We have calculated equilibrium isotope-fractionation factors between ice and carbon dioxide and found that the observed 18O/16O ratios of CO2 are indeed near isotopic equilibrium with the ice. This indicates that an exchange of oxygen atoms probably occurs between ice and included CO2.
Item Type: |
Conference or Workshop Item (Paper) |
---|---|
Division/Institute: |
08 Faculty of Science > Physics Institute 08 Faculty of Science > Physics Institute > Climate and Environmental Physics |
UniBE Contributor: |
Stauffer, Bernhard |
Subjects: |
500 Science > 530 Physics |
ISSN: |
0260-3055 |
Publisher: |
International Glaciological Society |
Language: |
English |
Submitter: |
BORIS Import 2 |
Date Deposited: |
13 Oct 2021 14:49 |
Last Modified: |
05 Dec 2022 15:52 |
Publisher DOI: |
10.3189/S0260305500004341 |
BORIS DOI: |
10.48350/158756 |
URI: |
https://boris.unibe.ch/id/eprint/158756 |