Extremely large variations of atmospheric 14C concentration during the last glacial period

J. W. Beck, D. A. Richards, R. L. Edwards, B. W. Silverman, P. L. Smart, D. J. Donahue, S. Hererra-Osterheld, G. S. Burr, L. Calsoyas, A.J. Timothy Jull, D. Biddulph

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Abstract

A long record of atmospheric 14C concentration, from 45 to 11 thousand years ago (ka), was obtained from a stalagmite with thermal-ionization mass-spectrometric 230Th and accelerator mass-spectrometric 14C measurements. This record reveals highly elevated δ 14C between 45 and 33 ka, portions of which may correlate with peaks in cosmogenic 36Cl and 10Be isotopes observed in polar ice cores. Superimposed on this broad peak of δ 14C are several rapid excursions, the largest of which occurs between 44.3 and 43.3 ka. Between 26 and 11 ka, atmospheric δ 14C decreased from ∼700 to ∼100 per mil, modulated by numerous minor excursions. Carbon cycle models suggest that the major features of this record cannot be produced with solar or terrestrial magnetic field modulation alone but also require substantial fluctuations in the carbon cycle.

Original languageEnglish (US)
Pages (from-to)2453-2458
Number of pages6
JournalScience
Volume292
Issue number5526
DOIs
StatePublished - Jun 29 2001

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Carbon Cycle
Ice
Magnetic Fields
Isotopes
Hot Temperature

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Beck, J. W., Richards, D. A., Edwards, R. L., Silverman, B. W., Smart, P. L., Donahue, D. J., ... Biddulph, D. (2001). Extremely large variations of atmospheric 14C concentration during the last glacial period. Science, 292(5526), 2453-2458. https://doi.org/10.1126/science.1056649

Extremely large variations of atmospheric 14C concentration during the last glacial period. / Beck, J. W.; Richards, D. A.; Edwards, R. L.; Silverman, B. W.; Smart, P. L.; Donahue, D. J.; Hererra-Osterheld, S.; Burr, G. S.; Calsoyas, L.; Jull, A.J. Timothy; Biddulph, D.

In: Science, Vol. 292, No. 5526, 29.06.2001, p. 2453-2458.

Research output: Contribution to journalArticle

Beck, JW, Richards, DA, Edwards, RL, Silverman, BW, Smart, PL, Donahue, DJ, Hererra-Osterheld, S, Burr, GS, Calsoyas, L, Jull, AJT & Biddulph, D 2001, 'Extremely large variations of atmospheric 14C concentration during the last glacial period', Science, vol. 292, no. 5526, pp. 2453-2458. https://doi.org/10.1126/science.1056649
Beck JW, Richards DA, Edwards RL, Silverman BW, Smart PL, Donahue DJ et al. Extremely large variations of atmospheric 14C concentration during the last glacial period. Science. 2001 Jun 29;292(5526):2453-2458. https://doi.org/10.1126/science.1056649
Beck, J. W. ; Richards, D. A. ; Edwards, R. L. ; Silverman, B. W. ; Smart, P. L. ; Donahue, D. J. ; Hererra-Osterheld, S. ; Burr, G. S. ; Calsoyas, L. ; Jull, A.J. Timothy ; Biddulph, D. / Extremely large variations of atmospheric 14C concentration during the last glacial period. In: Science. 2001 ; Vol. 292, No. 5526. pp. 2453-2458.
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