All age–depth models are wrong: but how badly?

The uncertainty and error associated with fitted age-depth models were investigated by fitting a range of models to sets of simulated radiocarbon dates based on varved sediments and comparing the modelled relationship with the varve timescale. With large numbers of dates, cubic smooth splines out-perform other models; with few dates, no model reliably provides a good fit to reality, and calculated confidence intervals are over-optimistic. (C) 2003 Elsevier Ltd. All rights reserved.

[1]  C. Litton,et al.  A Bayesian Approach to the Use of 14C Dates in the Estimation of the Age of Peat , 1995, Radiocarbon.

[2]  K. Bennett,et al.  Determining the age of the mid-Holocene Tsuga cana densis (hemlock) decline, eastern North America , 2002 .

[3]  A. Brauer,et al.  Lateglacial varve chronology and biostratigraphy of lakes Holzmaar and Meerfelder Maar, Germany , 2001 .

[4]  C. D. Litton,et al.  Bayesian Approach to Interpreting Archaeological Data , 1996 .

[5]  A. Lang,et al.  Annually dated late Weichselian continental paleoclimate record from the Eifel, Germany , 2000 .

[6]  J. W. Beck,et al.  INTCAL98 Radiocarbon Age Calibration, 24,000–0 cal BP , 1998, Radiocarbon.

[7]  C. Bryant,et al.  Summary findings of the fourth international radiocarbon intercomparison (FIRI)(1998–2001) , 2002 .

[8]  W. Dean,et al.  Elk Lake, Minnesota : evidence for rapid climate change in the north-central United States , 1993 .

[9]  Ross Ihaka,et al.  Gentleman R: R: A language for data analysis and graphics , 1996 .

[10]  P. Bartlein,et al.  Calibration of Radiocarbon Ages and the Interpretation of Paleoenvironmental Records , 1995, Quaternary Research.

[11]  K. Bennett,et al.  Confidence intervals for age estimates and deposition times in late-Quaternary sediment sequences , 1994 .

[12]  B. van Geel,et al.  A numerical approach to 14C wiggle-match dating of organic deposits: best fits and confidence intervals , 2003 .

[13]  R. Telford,et al.  The intercept is a poor estimate of a calibrated radiocarbon age , 2004 .

[14]  David J. Spiegelhalter,et al.  WinBUGS user manual version 1.4 , 2003 .

[15]  Geza Pesti,et al.  AGe model estimation in paleoclimatic research: fuzzy regression and radiocarbon uncertainties , 1997 .