Kaiser K. Felix
No Thumbnail Available
Now showing 1 - 2 of 2
ArticleLate glacial 14C ages from a floating, 1382-ring pine chronology(Dept. of Geosciences, University of Arizona, 2004) Kromer, Bernd ; Friedrich, Michael ; Hughen, Konrad A. ; Kaiser, K. Felix ; Remmele, Sabine ; Schaub, Matthias ; Talamo, SahraWe built a floating, 1382-ring pine chronology covering the radiocarbon age interval of 12,000 to 10,650 BP. Based on the strong rise of Δ14C at the onset of the Younger Dryas (YD) and wiggle-matching of the decadal-scale Δ14C fluctuations, we can anchor the floating chronology to the Cariaco varve chronology. We observe a marine reservoir correction higher than hitherto assumed for the Cariaco site, of up to 650 yr instead of 400 yr, for the full length of the comparison interval. The tree-ring Δ14C shows several strong fluctuations of short duration (a few decades) at 13,800; 13,600; and 13,350 cal BP. The amplitude of the strong Δ14C rise at the onset of the YD is about 40‰, whereas in the marine data set the signal appears stronger due to a re-adjustment of the marine mixed-layer Δ14C towards the atmospheric level.
ArticleIntCal09 and Marine09 radiocarbon age calibration curves, 0–50,000 years cal BP(Dept. of Geosciences, University of Arizona, 2009-12) Reimer, Paula J. ; Bard, Edouard ; Bayliss, Alex ; Beck, J. Warren ; Blackwell, Paul G. ; Bronk Ramsey, Christopher ; Buck, Caitlin E. ; Cheng, Hai ; Edwards, R. Lawrence ; Friedrich, Michael ; Grootes, Pieter M. ; Guilderson, Thomas P. ; Haflidason, Haflidi ; Hajdas, Irka ; Hatte, Christine ; Heaton, Timothy J. ; Hoffmann, Dirk L. ; Hogg, Alan G. ; Hughen, Konrad A. ; Kaiser, K. Felix ; Kromer, Bernd ; Manning, Sturt W. ; Niu, Mu ; Reimer, Ron W. ; Richards, David A. ; Scott, E. Marian ; Southon, John R. ; Staff, Richard A. ; Turney, Christian S. M. ; van der Plicht, JohannesThe IntCal04 and Marine04 radiocarbon calibration curves have been updated from 12 cal kBP (cal kBP is here defined as thousands of calibrated years before AD 1950), and extended to 50 cal kBP, utilizing newly available data sets that meet the IntCal Working Group criteria for pristine corals and other carbonates and for quantification of uncertainty in both the 14C and calendar timescales as established in 2002. No change was made to the curves from 0–12 cal kBP. The curves were constructed using a Markov chain Monte Carlo (MCMC) implementation of the random walk model used for IntCal04 and Marine04. The new curves were ratified at the 20th International Radiocarbon Conference in June 2009 and are available in the Supplemental Material at www.radiocarbon.org.