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Climate of the Past An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/cp-2017-119
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
29 Sep 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Climate of the Past (CP).
Moving beyond the age-depth model paradigm in deep sea palaeoclimate archives: dual radiocarbon and stable isotope analysis on single foraminifera
Bryan C. Lougheed1,*, Brett Metcalfe2,3,*, Ulysses S. Ninnemann4, and Lukas Wacker5 1Department of Earth Sciences, Uppsala University, Villavägen 16, 75236 Uppsala, Sweden
2Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, France
3Department of Earth Sciences, Faculty of Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081HV Amsterdam, the Netherlands
4Department of Earth Science, University of Bergen, Allégaten 41, 5007 Bergen, Norway
5Laboratory for Ion Beam Physics, ETH Zürich, Otto-Stern-Weg 5, 8093 Zürich, Switzerland
*These authors contributed equally to this work.
Abstract. Late-glacial palaeoclimate reconstructions from deep-sea sediment archives provide valuable insight into past rapid changes in ocean chemistry, but only a small proportion of the ocean floor is suitable for such reconstructions using the existing state-of-the-art using the age-depth approach. We employ ultra-small radiocarbon (14C) dating on single microscopic foraminifera to demonstrate that the longstanding age-depth method conceals large age uncertainty caused by post-depositional sediment mixing, meaning that existing studies may underestimate total geochronological error. To overcome these problems, we use dual 14C and stable isotope (δ18O and δ13C) analysis on single microscopic foraminifera to produce a palaeoclimate time series independent of the age-depth paradigm. This new and novel method will address large geographical gaps in late-glacial benthic palaeoceanographic reconstructions by opening up vast areas of previously disregarded deep-sea archives, leading to improved understanding of the global interaction between oceans and climate.

Citation: Lougheed, B. C., Metcalfe, B., Ninnemann, U. S., and Wacker, L.: Moving beyond the age-depth model paradigm in deep sea palaeoclimate archives: dual radiocarbon and stable isotope analysis on single foraminifera, Clim. Past Discuss., https://doi.org/10.5194/cp-2017-119, in review, 2017.
Bryan C. Lougheed et al.
Bryan C. Lougheed et al.
Bryan C. Lougheed et al.

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Short summary
Palaeoclimate reconstructions from deep-sea sediment archives provide valuable insight into past rapid climate change, but only a small proportion of the ocean is suitable for such reconstructions using the existing state-of-the-art, i.e. the age-depth approach. We use ultra-small radiocarbon (14C) dating on single foraminifera to quantify and overcome issues associated with the age-depth approach, thus facilitating past ocean chemistry reconstructions from vast, previously untapped ocean areas.
Palaeoclimate reconstructions from deep-sea sediment archives provide valuable insight into past...
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