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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Volume 8, issue 5
Clim. Past, 8, 1765–1779, 2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Advances in understanding and applying speleothem climate...

Clim. Past, 8, 1765–1779, 2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 31 Oct 2012

Research article | 31 Oct 2012

COnstructing Proxy Records from Age models (COPRA)

S. F. M. Breitenbach1, K. Rehfeld2,3, B. Goswami2,4, J. U. L. Baldini5, H. E. Ridley5, D. J. Kennett6, K. M. Prufer7, V. V. Aquino7, Y. Asmerom8, V. J. Polyak8, H. Cheng9,10, J. Kurths2, and N. Marwan2 S. F. M. Breitenbach et al.
  • 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 16803, USA
  • 7Department of Anthropology, University of New Mexico, Albuquerque, NM 87131, USA
  • 8Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131, USA
  • 9Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, China
  • 10Department of Earth Sciences, University of Minnesota, Minneapolis, MN 55455, USA

Abstract. Reliable age models are fundamental for any palaeoclimate reconstruction. Available interpolation procedures between age control points are often inadequately reported, and very few translate age uncertainties to proxy uncertainties. Most 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 framework that allows detection and interactive handling of age reversals and hiatuses, depth-age modeling, and proxy-record reconstruction. Monte Carlo simulation and a translation procedure are used to assign a precise time scale to climate proxies and to translate dating uncertainties to uncertainties in the proxy values. The presented framework allows integration of incremental relative dating information to improve the final age model. The free software package COPRA1.0 facilitates easy interactive usage.

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