14C Activity and Global Carbon Cycle Changes over the Past 50,000 Years

Science

Volumn 303, Issue 5655, 2004, Pages 202-207

  Hughen, K ^a   Lehman, S ^b   Southon, J ^c   Overpeck, J ^d,e   Marchal, O ^a   Herring, C ^a   Turnbull, J ^b  

^a WOODS HOLE OCEANOGRAPHIC INSTITUTION   (United States)

^b UNIVERSITY OF COLORADO   (United States)

^c UNIVERSITY OF CALIFORNIA   (United States)

^d University of Arizona   (United States)

^e UNIVERSITY OF ARIZONA   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

CALIBRATION; CARBON; GEOMAGNETISM; GLACIERS; ICE; RADIOMETRY; SEDIMENTS;

GEOMAGNETIC FIELDS; GLACIATION;

OFFSHORE DRILLING;

CARBON 14; ICE;

CARBON CYCLE; CHRONOLOGY; ICE CORE; OCEAN DRILLING PROGRAM; RADIOCARBON DATING;

ARTICLE; CALIBRATION; CARBON CYCLE; GEOCHEMISTRY; GREENLAND; MAGNETIC FIELD; OCEAN ENVIRONMENT; PRIORITY JOURNAL; RADIATION MEASUREMENT; RADIOACTIVITY; RADIOMETRY; SEDIMENT; SIMULATION;

EID: 0346340053     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.1090300     Document Type: Article

References (43)

1. 4 years.
2. M. Stuiver et al., Radiocarbon 40, 1041 (1998).
3. B. Kromer, M. Spurk, Radiocarbon 40, 1117 (1998).
4. K. A. Hughen et al., Nature 391, 65 (1998).
5. E. Bard et al., Radiocarbon 40, 1085 (1998).
6. H. Kitigawa, J. Van der Plicht, Science 279, 1187 (1998).
7. J. W. Beck et al., Science 292, 2453 (2001).
8. A. Schramm, M. Stein, S. L. Goldstein, Earth Planet. Sci. Lett. 175, 27 (2000).
9. A. H. L. Voelker, P. M. Grootes, M.-J. Nadeau, M. Sarnthein, Radiocarbon 42, 437 (2000).
10. S. van Kreveld et al., Paleoceanography 15, 425 (2000).
11. 14C decay constant, and t is the calendar age (37).
12. D. A. Meese et al., J. Geophys. Res. 102, 26411 (1997).
13. K. A. Hughen, J. R. Southon, S. J. Lehman, J. T. Overpeck, Science 290, 1951 (2000).
14. Materials and methods are available as supporting material on Science Online.
15. D. E. Black et al., Science 286, 1709 (1999).
16. K. A. Hughen, J. T. Overpeck, L. C. Peterson, S. Trumbore, Nature 380, 51 (1996).
17. L. C. Peterson, G. H. Haug, K. A. Hughen, U. Rohl, Science 290, 1947 (2000).
18. D. Rind, D. Peteet, W. S. Broecker, A. McIntyre, W. Ruddiman, Clim. Dyn. 1, 3 (1986).
19. S. Johnsen et al., J. Quat. Sci. 16, 299 (2001).
20. Y. J. Wang et al., Science 294, 2345 (2001).
21. D. Genty et al., Nature 421, 833 (2003).
22. J. Beer et al., Quat. Sci. Rev. 21, 1129 (2002).
23. C. Laj et al., Earth Planet. Sci. Lett. 200, 177 (2002).
24. T. Ton-That, B. Singer, M. Paterne, Earth Planet. Sci. Lett. 184, 645 (2001).
25. P. B. Gans et al., Geol. Soc. Am. Abstr. Programs 31, 56 (1999).
26. D. Lal, in Solar-Terrestrial Relationships and the Earth Environment in the Last Millenia, vol. 95 of Proceedings of the International School of Physics, Enrico Fermi (North Holland, Bologna, Italy, 1988), p. 216.
27. J. Masarik, J. Beer, J. Geophys. Res. 104, 12,099 (1999).
28. P. E. Damon, R. E. Sternberg Radiocarbon 31, 697 (1989).
29. 14C for the past 50 ka B.P. within ±10%. of the simple box model. Subsequent gracial perturbation experiments were carried out in the box model as a computational expedient.
30. 2 by an average of -0.3‰ (41).
31. Reduced deep-ocean ventilation is consistent with potentially restricted NADW formation and penetration in the glacial ocean. Global transects of radio-carbon distribution in the oceans suggest that NADW formation is responsible for sequestering up to 75% of the radiocarbon in the deep ocean (42).
32. This change represents a 120-m lowering of sea level and the resultant shift of carbonate sedimentation off the continental shelves into deep water, where dissolution is much more extensive. Discussion and details of the glacial carbon cycle boundary conditions are summarized in SOM Text, fig. S3, and table S2.
33. L. D. Keigwin, S. J. Lehman, Paleoceanography 9, 185 (1994).
34. J. F. McManus, R. Francois, J.-M. Gherardi, L. D. Keigwin, S. Brown-Leger, in preparation.
35. W. B. Curry, T. M. Marchitto, J. F. McManus, D. W. Oppo, K. L. Laarkamp, in Mechanisms of Global Climate Change at Millennial Time Scales, P. U. Clark, R. S. Webb, L. D. Keigwin, Eds. (American Geophysical Union, Washington, DC, 1999), vol. 112, p. 59.
36. T. F. Stocker, D. G. Wright, Radiocarbon 40, 359 (1998).
37. M. Stuiver, H. A. Polach, Radiocarbon 19, 355 (1977).
38. O. Marchal, T. F. Stocker, R. Muscheler, Earth Planet. Sci. Lett. 185, 383 (2001).
39. A. Indermuhle, E. Monnin, B. Stauffer, T. F. Stocker, M. Wahlen, Geophys. Res. Lett. 27, 735 (2000).
40. K. D. Alverson, R. S. Bradley, T. F. Pederson, Eds., Paleoclimate, Global Change and the Future (Springer Verlag, New York, 2003).
41. W. B. Curry, J.-C. Duplessy, L. D. Labeyrie, N. J. Shackleton, Paleoceanography 3, 317 (1988).
42. W. S. Broecker, Science 300, 1519 (2003).
43. This work was supported by NSF (OCE-0117356), Lawrence Livermore National Laboratory (LDRD-97-ERI-009), and the U.S. Department of Energy (W-7405-Eng-48). We thank the ODP Core Repository in Bremen for core sampling; B. Frantz and P. Zermeno for sample preparation assistance; C. Laj, M. Frank, J.-P. Valet, and J. Stoner for providing their data of past geomagentic field intensities; and S. Johnsen for making available the revised GRIPss09sea chronology. This is WHOI contribution no, 11061.