This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
References
Neftel, A., Oeschger, H., Staffelbach, T. & Stauffer, B. Nature 331, 609–611 (1988).
Barnola, J. M., Raynaud, D., Korotkevitch, Y. S. & Lorius, C. Nature 329, 408–414 (1987).
Francois, R., Altabet, M. & Burckle, L. Paleoceanography 7, 589–606 (1992).
Kumar, N., Gwiazda, R., Anderson, R. F. & Froelich, P. N. Nature 362, 45–48 (1993).
Toggweiler, R. & Sarmiento, J. L. in The Carbon Cycle and Atmospheric CO2: Natural Variations Archean to Present (eds Sundquist, E. & Broecker, W. S.) 163–184 (Am. Geophys. Un., 1985).
Ennever, F. & McElroy, M. in The Carbon Cycle and Atmospheric CO2: Natural Variations Archean to Present (eds Sundquist, E. & Broecker, W. S.) 154–162 (Am. Geophys. Un., 1985).
Wenk, T. & Siegenthaler, U. in Natural Variations in Carbon Dioxide and the Carbon Cycle: Archean to Present (eds Sundquist, E. & Broecker, W. S.) 185–194 (Am. Geophys. Un., 1985).
Broecker, W. S. & Peng, T.-H. Glob. biogeochem. Cycles 3, 215–240 (1989).
Kallel, N., Labeyrie, L. D., Juillet-Laclerc, A. & Duplessy, J. C. Nature 333, 651–655 (1988).
Mortlock, R. A. et al. Nature 351, 220–222 (1991).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Boyle, E. Measures of productivity. Nature 362, 21–22 (1993). https://doi.org/10.1038/362021a0
Published:
Issue Date:
DOI: https://doi.org/10.1038/362021a0