Building and testing age models for radiocarbon dates in Lateglacial and Early Holocene sediments |
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| Institution: | 1. Research Laboratory for Archaeology, University of Oxford, Oxford OX1 3QY, UK;2. Center for Mathematical Research CIMAT, Guanajuato, Mexico;3. Centre for Isotope Research, Groningen University, Groningen, The Netherlands;4. Faculty of Archaeology, Leiden University, Leiden, The Netherlands;1. Utrecht University, Department of Physical Geography, Faculty of Geosciences, P.O. Box 80115, NL-3508 TC Utrecht, The Netherlands. E-mail: w.hoek@geo.uu.nl. Tel.: +31(0)30 2532416; Fax.: +31 (0)30 2531145.;2. Vrije Universiteit Amsterdam, Faculty of Earth and Life Sciences, De Boelelaan 1085, HV Amsterdam. The Netherlands. E-mail: hanneke.bos@falw.vu.nl; Tel.:+31 20 525 7666; Fax.: +31 20 525 7832.;1. Department of Geography, College of Science, Swansea University, Singleton Park, Abertawe, Cymru SA2 8PP, UK;2. British Geological Survey, Cardiff University, Main Building, Park Place, Caerdydd, Cymru CF10 3AT, UK;3. Natural Resources Wales, Maes Newydd, Britannic Way West, Llandarcy, Neath Port Talbot, Cymru SA10 6JQ, UK;1. School of Natural and Built Environment, Queen''s University Belfast, Belfast BT7 1NN, Northern Ireland, United Kingdom;2. Centro de Investigación en Matemáticas CIMAT, Guanajuato 36023, Guanajuato, Mexico;3. School of Geography & Sustainable Development, University of St Andrews, St Andrews KY16 9AL, Scotland, United Kingdom;4. Queen''s Marine Laboratory, Queen''s University Belfast, Portaferry BT22 1PF, Northern Ireland, United Kingdom;1. Institute of Earth Sciences, Heidelberg University, Im Neuenheimer Feld 234–236, D-69120, Heidelberg, Germany;2. School of the Environment, Geography and Geosciences, University of Portsmouth, Buckingham Building, Lion Terrace, Portsmouth, PO1 3HE, United Kingdom;3. GEOMAR Helmholtz Center for Ocean Research Kiel, Wischhofstraße 1–3, D-24148, Kiel, Germany;4. Vernadsky Institute of Geochemistry and Analytical Chemistry, Kosigin Street 19, Moscow, 119991, Russia;5. GFZ German Research Centre for Geosciences, Section 3.6 Chemistry and Physics of Earth Materials, Telegrafenberg, D-14473, Potsdam, Germany;1. Faculty of Earth Sciences, University of Iceland, Reykjavík, Iceland;2. INSTAAR and Department of Geological Sciences, University of Colorado Boulder, CO, USA;1. Department of Geography, College of Science, Swansea University, Singleton Park, Swansea SA2 8PP, UK;2. Centre for Arctic Gas Hydrate, Environment and Climate (CAGE), Department of Geology, University of Trømso, NO9037 Trømso, Norway;3. Department of Geography, Royal Holloway, Egham Hill, Egham TW20 0EX, UK;1. Centre for Quaternary Research, Royal Holloway, University of London, Egham Hill, Surrey, TW20 0EX, UK;2. Department of Geography, College of Science, Swansea University, Singleton Park, Swansea, SA2 8PP, Wales, UK;3. GFZ German Research Centre for Geosciences, Telegrafenberg, Building C, 14473, Potsdam, Germany;4. Department of Geography, University of Portsmouth, Buckingham Building, Lion Terrace, Portsmouth, PO1 3HE, UK;5. Geography, University of Manchester, Arthur Lewis Building, Oxford Road, Manchester, M13 9PL, UK;6. School of Geography, Archaeology and Palaeoecology, Queen''s University, Belfast, BT7 1 NN, Northern Ireland, UK;7. Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100, Copenhagen, Denmark;8. Dipartimento di Scienze della Terra, University of Pisa, Pisa, Italy |
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| Abstract: | The growing importance of understanding past abrupt climate variability at a regional and global scale has led to the realisation that independent chronologies of past environmental change need to be compared between various archives. This has in turn led to attempts at significant improvements in the required precision at which records can be dated. Radiocarbon dating is still the most prominent method for dating organic material from terrestrial and marine archives, and as such many of the recent developments in improving precision have been aimed at this technique. These include: (1) selection of the most suitable datable fractions within a record, (2) the development of better calibration curves, and (3) more precise age modelling techniques. While much attention has been focussed on the first two items, testing the possibilities of the relatively new age modelling approaches has not received much attention. Here, we test the potential for methods designed to significantly improve precision in radiocarbon-based age models, wiggle match dating and various forms of Bayesian analyses. We demonstrate that while all of the methods can perform very well, in some scenarios, caution must be taken when applying them. It appears that an integrated approach is required in real life dating situations where more than one model is applied, with strict error calculation, and with the integration of radiocarbon data with sedimentological analyses of site formation processes. |
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