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Regional 14CO2 Offsets in the Troposphere: Magnitude, Mechanisms, and Consequences

Science
6 Dec 2001
Vol 294, Issue 5551
pp. 2529-2532

Abstract

Radiocarbon dating methods typically assume that there are no significant tropospheric 14CO2 gradients within the low- to mid-latitude zone of the Northern Hemisphere. Comparison of tree ring 14C data from southern Germany and Anatolia supports this assumption in general but also documents episodes of significant short-term regional14CO2 offsets. We suggest that the offset is caused by an enhanced seasonal 14CO2 cycle, with seasonally peaked flux of stratospheric 14C into the troposphere during periods of low solar magnetic activity, coinciding with substantial atmospheric cooling. Short-term episodes of regional14CO2 offsets are important to palaeoclimate studies and to high-resolution archaeological dating.

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REFERENCES AND NOTES

1
M. Stuiver et al., Radiocarbon40, 1041 (1998).
2
Stuiver M., Braziunas T. F., Geophys. Res. Lett. 25, 329 (1998).
3
Braziunas T. F., Fung I. Y., Stuiver M., Global Biogeochem. Cycles 9, 565 (1995).
4
Levin I., Hesshaimer V., Radiocarbon 42, 69 (2000).
5
Stuiver M., Pearson G. W., Radiocarbon 35, 1 (1993).
6
McCormac F. G., Baillie M. G. L., Pilcher J. R., Radiocarbon 37, 395 (1995).
7
Pearson G. W., Stuiver M., Radiocarbon 35, 25 (1993).
8
Vogel J. C., Fuls A., Visser E., Becker B., Radiocarbon 35, 73 (1993).
9
S. W. Manning, A Test of Time: The Volcano of Thera and the Chronology and History of the Aegean and East Mediterranean in the Mid Second Millennium BC (Oxbow Books, Oxford, 1999).
10
M. Spurk et al., Radiocarbon 40, 1 (1998).
11
Stuiver M., Becker B., Radiocarbon 35, 35 (1993).
12
Samples (19 to 25 g) were pretreated with the AAA sequence (32, 33). All samples were combusted to CO2, and their 14C activity was determined by CO2 gas counting for a total counting time of 7 to 10 days. The error as reported consists of Poisson counting statistics (∼1.1 ‰) and regression analyses of background versus barometric pressure and standard versus gas purity (34). We consider our approach to the error calculation to be conservative, as the regression analysis includes empirical evidence of otherwise unspecified fluctuations in counter-performance in addition to the purely Poisson error components. The total error (1σ) of the 14C age determination of a decadal wood sample was between 10 and 19 years for full-sized samples. For some replicates, we had less wood available (8 g), increasing the error to up to 29 years for these samples.
13
Stuiver M., Reimer P. J., Braziunas T. F., Radiocarbon 40, 1127 (1998).
14
Stuiver M., Quay P., Science 207, 11 (1980).
15
H. H. Lamb, Climate, History and the Modern World (Routledge, London, 1995).
16
K. R. Briffa et al., J. Geophys. Res.106, 2929 (2001). These authors use a novel approach to temperature reconstruction, which offers warmer summer temperatures for Siberia for the 15th century A.D. in their final temperature reconstruction, at odds, as the authors note (on p. 2938), with other methods of temperature estimation (see their figure 4) and with most other Northern Hemisphere reconstructions (see their plate 3), which find a clear cool period from around 1450 A.D.
17
P. I. Kuniholm et al., Nature381, 780 (1996).
18
Ramsey C. B., Radiocarbon 37, 425 (1995).
19
B. van Geel et al., Radiocarbon40, 531 (1998).
20
G. Bond et al., Science 15 November 2001 (10.1126/science. 1065680).
21
V. Hesshaimer, thesis, Univ. of Heidelberg, Heidelberg, Germany (1997).
22
Nesme-Ribes E., Sokoloff D., Ribes J. C., Kremliovsky M., NATO ASI Ser. I, 71 (1994).
23
Bard E., Raisbeck G., Yiou F., Jouzel J., Tellus 52B, 985 (2000).
24
Masarik J., Beer J., J. Geophys. Res. 104, 12099 (1999).
25
Hurrell J., Science 269, 676 (1995).
26
Chmielewski F. M., Rotzer T., Agric. Forest Meteorol. 108, 101 (2001).
27
Lean J., Rind D., J. Clim. 11, 3069 (1998).
28
Balachandran N. K., Rind D., J. Clim. 8, 2059 (1995).
29
Shindell D. T., Schmidt G. A., Miller R. L., Rind D., J. Geophys. Res. 106, 7193 (2001).
30
van Loon H., Labitzke K., J. Clim. 11, 1529 (1998).
31
Manning S. W., Kromer B., Kuniholm P. I., Newton M. W., Science 294, 2532 (2001).
32
Kromer B., Becker B., Radiocarbon 35, 125 (1993).
33
The TuP samples were, in addition, pretreated in a Soxhlet extraction to remove resins. We did not further convert the samples to cellulose, because in numerous studies we determined that the results from our version of the AAA sequence do not differ from those of the full cellulose pretreatment [see, for example, table 2 of (1)].
34
B. Kromer, K.-O. Münnich, in Radiocarbon After Four Decades, R. E. Taylor, A. Long, R. S. Kra, Eds. (Springer, New York, 1992), pp. 184–197.
35
We thank P. Reimer, M. Stuiver, C. Bronk Ramsey, M. Bell, D. Wagenbach, P. Valdes, and J. Chiment for discussions; M. J. Bruce and K. B. Harris for manuscript preparation; and two anonymous Science reviewers. We thank the Institute for Aegean Prehistory for funding the majority of this work; we also acknowledge the support of NSF, the Malcolm H. Wiener Foundation, and the Federal Ministry of Education and Research (Bundesministerium für Bildung und Forschung).

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Published In

Science
Volume 294 | Issue 5551
21 December 2001

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Submission history

Received: 10 September 2001
Accepted: 27 November 2001
Published in print: 21 December 2001

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Authors

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Bernd Kromer*
Heidelberger Akademie der Wissenschaften,
Sturt W. Manning
Department of Archaeology, University of Reading, Post Office Box 218 Whiteknights, Reading RG6 6AA, UK.
Peter Ian Kuniholm
The Malcolm and Carolyn Wiener Laboratory for Aegean and Near Eastern Dendrochronology, B-48 Goldwin Smith Hall, Cornell University, Ithaca, NY 14853–3201, USA.
Maryanne W. Newton
The Malcolm and Carolyn Wiener Laboratory for Aegean and Near Eastern Dendrochronology, B-48 Goldwin Smith Hall, Cornell University, Ithaca, NY 14853–3201, USA.
Marco Spurk
Institut für Botanik-210, Universität Hohenheim, D-70593 Stuttgart, Germany.
Ingeborg Levin
Institut für Umweltphysik der Universität Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany.

Notes

*
To whom correspondence should be addressed. E-mail: [email protected]

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