Clim. Past Discuss., 8, 2369-2408, 2012
© Author(s) 2012. This work is distributed
under the Creative Commons Attribution 3.0 License.
Review Status
This discussion paper has been under review for the journal Climate of the Past (CP). Please refer to the corresponding final paper in CP.
COnstructing Proxy-Record Age models (COPRA)
S. F. M. Breitenbach1, K. Rehfeld2,3, B. Goswami2,4, J. U. L. Baldini5, H. E. Ridley5, D. Kennett6, K. Prufer7, V. V. Aquino7, Y. Asmerom8, V. J. Polyak8, H. Cheng9, J. Kurths2, and N. Marwan2
1Geological Institute, Department of Earth Sciences, ETH Zurich, 8092 Zurich, Switzerland
2Potsdam Institute for Climate Impact Research (PIK), 14412 Potsdam, Germany
3Department of Physics, Humboldt Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany
4Department of Physics, University of Potsdam, Karl-Liebknecht Str. 24–25, 14476 Potsdam, Germany
5Department of Earth Sciences, Durham University, Durham, DH1 3LE, UK
6Department of Anthropology, The Pennsylvania State University, University Park, PA 16827, USA
7Department of Anthropology, University of New Mexico, Albuquerque, USA
8Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico, USA
9Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, China and Department of Earth Sciences, University of Minnesota, Minneapolis, USA

Abstract. Reliable age models are fundamental for any palaeoclimate reconstruction. Interpolation procedures between age control points are often inadequately reported, and available modeling algorithms do not allow incorporation of layer counted intervals to improve the confidence limits of the age model in question. We present a modeling approach that allows automatic detection and interactive handling of outliers and hiatuses. We use Monte Carlo simulation to assign an absolute time scale to climate proxies by conferring the dating uncertainties to uncertainties in the proxy values. The algorithm allows us to integrate incremental relative dating information to improve the final age model. The software package COPRA1.0 facilitates easy interactive usage.

Citation: Breitenbach, S. F. M., Rehfeld, K., Goswami, B., Baldini, J. U. L., Ridley, H. E., Kennett, D., Prufer, K., Aquino, V. V., Asmerom, Y., Polyak, V. J., Cheng, H., Kurths, J., and Marwan, N.: COnstructing Proxy-Record Age models (COPRA), Clim. Past Discuss., 8, 2369-2408, doi:10.5194/cpd-8-2369-2012, 2012.
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