Nature Publishing Group, publisher of Nature, and other science journals and reference works
my account e-alerts subscribe register
Thursday 17 August 2017
Journal Home
Current Issue
Download PDF
Export citation
Export references
Send to a friend
More articles like this

Letters to Nature
Nature 315, 45 - 47 (02 May 1985); doi:10.1038/315045a0

Evidence from polar ice cores for the increase in atmospheric CO2 in the past two centuries

A. Neftel, E. Moor, H. Oeschger & B. Stauffer

Physics Institute, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland

Precise and continuous measurements of atmospheric CO2 concentration were first begun in 1958 and show a clear increase from 315 parts per million by volume (p.p.m.v.)1 then to 345 p.p.m.v. now. A detailed knowledge of the CO2 increase since preindustrial time is a prerequisite for understanding several aspects of the role of CO2, such as the contribution of biomass burning to the CO2 increase and the sensitivity of climate to the CO2 concentration in the atmosphere. Estimates of the preindustrial CO2 concentration are in the range 250–290 p.p.m.v. (ref. 2), but the precise level then and the time dependence of the increase to the present levels remain obscure. The most reliable assessment of the ancient atmospheric CO2 concentration is derived from measurements of air occluded in ice cores. An ice core from Siple Station (West Antartica) that allows determination of the enclosed gas concentration with very good time resolution has recently become available. We report here measurements of this core which now allow us to trace the development of the atmospheric CO2 from a period overlapping the Mauna Loa record back over the past two centuries.



1. Keeling, C. D. et al. Tellus 28, 538−551 (1976). | ISI | ChemPort |
2. WMO Rep. 10 (World Meteorological Organization, Geneva, 1983).
3. Schwander, J. thesis, Univ. Bern (1984).
4. Schwander, J. & Stauffer, B. Nature 311, 45−47 (1984). | Article | ISI | ChemPort |
5. Zumbrunn, R., Neftel, A. & Oeschger, H. Earth planet. Sci. Lett. 60, 318−324 (1982). | Article | ISI | ChemPort |
6. Moor, E. & Stauffer, B. J. Glaciol. (in the press).
7. Barnola, J. M., Raynaud, D., Neftel, A. & Oeschger, H. Nature 303, 410−412 (1983). | Article | ISI | ChemPort |
8. Neftel, A., Oeschger, H., Schwander, J., Stauffer, B. & Zumbrunn, R. Nature 295, 220−223 (1982). | Article | ISI | ChemPort |
9. Stauffer, B. et al. Ann. Glaciol. 5, 160−164 (1984). | ISI | ChemPort |
10. Stauffer, B. et al. Ann. Glaciol. (in the press).
11. Keeling, C. D. et al. Tellus 28, 552−564 (1976). | ChemPort |
12. Rotty, R. M. in Carbon Cycle Modelling Scope 16 (ed. Bolin, B.) 121−126 (Wiley New York, 1981). | ChemPort |
13. Friedli, H. et al. Geophys. Res. Lett. 11, 1145−1148 (1984). | ISI | ChemPort |

© 1985 Nature Publishing Group
Privacy Policy