Letter | Published:

Recent trends in the 13C/12C ratio of atmospheric carbon dioxide

Naturevolume 277pages121123 (1979) | Download Citation

Subjects

Abstract

THE 13C/12C ratio of atmospheric carbon dioxide has decreased by approximately 0.6‰ over 22 yr according to new direct measurements reported here. Our results offer a way of establishing whether 13C/12C ratios of tree rings1–6 are representative of atmospheric 13CO2 variations. We have carried out both isotopic (at Groningen) and concentration (at La Jolla) measurements of atmospheric CO2 on air samples obtained during 1977 and 1978 at three widely spaced locations: La Jolla, California (33°N, 117°W), Fanning Island (4°N, 159°W) and the South Pole. Sampling, instrumental, and analytical procedures closely matched a similar study carried out 22 yr earlier by Keeling7,8.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

References

  1. 1

    Farmer, J. G. & Baxter, M. S. Nature 247, 273–275 (1974).

  2. 2

    Freyer, H. D. & Wiesberg, L. Nature 252, 757 (1974).

  3. 3

    Pearman, G. I., Francey, R. J. & Fraser, P. J. B. Nature 260, 771–772 (1976).

  4. 4

    Rebello, A. & Wagener, K. in Environmental Biogeochemistry (ed. Nriagu, J. O.) Vol. 1, 13–23 (Ann Arbor, Michigan, 1976).

  5. 5

    Stuiver, M. Science 199, 253–258 (1978).

  6. 6

    Tans, P. P. thesis, Univ Groningen (1978).

  7. 7

    Keeling, C. D. Geochim. cosmochim. Acta 13, 322–334 (1958).

  8. 8

    Keeling, C. D. Geochim. cosmochim. Acta 24, 277–298 (1961).

  9. 9

    Craig, H. Geochim. cosmochim. Acta 12, 133–149 (1957).

  10. 10

    Mook, W. G. thesis, Univ Groningen (1968).

  11. 11

    Keeling, C. D. et al. Tellus 28, 538–551 (1976).

  12. 12

    Craig, H. & Keeling, C. D. Geochim. cosmochim. Acta 27, 549–551 (1963).

  13. 13

    Weiss, R. F. & Craig, H. Geophys. Res. Lett. 3, 751–753 (1976).

  14. 14

    Keeling, C. D., Adams, J. A., Ekdahl, C. A. & Guenther, P. R. Tellus 28, 552–564 (1976).

  15. 15

    Keeling, C. D., Bacastow, R. B. & Tans, P. P. Geophys. Res. Lett. (submitted).

  16. 16

    Oeschger, H., Siegenthaler, U., Schotterer, U. & Gugelmann, A. Tellus 27, 168–192 (1975).

  17. 17

    Keeling, C. D. & Bacastow, R. B. in Energy and Climate 72–95 (Natn. Acad. Sciences, Washington D. C. 1977).

  18. 18

    Keeling, C. D. in Chemistry of the Lower Atmosphere (ed. Rasool, S.I.) 251–329 (Plenum, New York, 1973).

Download references

Author information

Affiliations

  1. Scripps Institution of Oceanography, Westersingel 34, Groningen, The Netherlands

    • CHARLES D. KEELING
  2. Isotope Physics Laboratory, University of Groningen, Westersingel 34, Groningen, The Netherlands

    • WIM G. MOOK
  3. Scripps Institution of Oceanography, University of California at San Diego, La Jolla, California, 93093

    • PIETER P. TANS

Authors

  1. Search for CHARLES D. KEELING in:

  2. Search for WIM G. MOOK in:

  3. Search for PIETER P. TANS in:

About this article

Publication history

Received

Accepted

Issue Date

DOI

https://doi.org/10.1038/277121a0

Further reading

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.