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Moving beyond the a...
Moving beyond the age-depth model paradigm in deep-sea palaeoclimate archives : dual radiocarbon and stable isotope analysis on single foraminifera
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- Lougheed, Bryan C. (författare)
- Uppsala universitet,Naturresurser och hållbar utveckling,Uppsala UniUniv Paris Saclay, IPSL, LSCE, CEA,CNRS,UVSQ, F-91190 Gif Sur Yvette, France
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- Metcalfe, Brett (författare)
- Univ Paris Saclay, IPSL, LSCE, CEA,CNRS,UVSQ, F-91190 Gif Sur Yvette, France;Vrije Univ Amsterdam, Dept Earth Sci, Fac Sci, De Boelelaan 1085, NL-1081 HV Amsterdam, Netherlands
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- Ninnemann, Ulysses S. (författare)
- Univ Bergen, Dept Earth Sci, Allegaten 41, N-5007 Bergen, Norway
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- Wacker, Lukas (författare)
- Swiss Fed Inst Technol, Lab Ion Beam Phys, Otto Stern Weg 5, CH-8093 Zurich, Switzerland
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(creator_code:org_t)
- 2018-04-20
- 2018
- Engelska.
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Ingår i: Climate of the Past. - : Copernicus GmbH. - 1814-9324 .- 1814-9332. ; 14:4, s. 515-526
- Relaterad länk:
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https://uu.diva-port... (primary) (Raw object)
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https://cp.copernicu...
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https://urn.kb.se/re...
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https://doi.org/10.5...
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Abstract
Ämnesord
Stäng
- Late-glacial palaeoclimate reconstructions from deep-sea sediment archives provide valuable insight into past rapid changes in ocean chemistry. Unfortunately, only a small proportion of the ocean floor with sufficiently high sediment accumulation rate (SAR) is suitable for such reconstructions using the long-standing age-depth model approach. We employ ultra-small radiocarbon (C-14) dating on single microscopic foraminifera to demonstrate that the long-standing age-depth model method conceals large age uncertainties caused by post-depositional sediment mixing, meaning that existing studies may underestimate total geochronological error. We find that the age-depth distribution of our C-14-dated single foraminifera is in good agreement with existing bioturbation models only after one takes the possibility of Zoophycos burrowing into account. To overcome the problems associated with the age-depth paradigm, we use the first ever dual C-14 and stable isotope (delta O-18 and delta C-13) analysis on single microscopic foraminifera to produce a palaeoclimate time series independent of the age-depth paradigm. This new state of the art essentially decouples single foraminifera from the age-depth paradigm to provide multiple floating, temporal snapshots of ocean chemistry, thus allowing for the successful extraction of temporally accurate palaeoclimate data from low-SAR deep-sea archives. This new method can address large geographical gaps in late-glacial benthic palaeoceanographic reconstructions by opening up vast areas of previously disregarded, low-SAR deep-sea archives to research, which will lead to an improved understanding of the global interaction between oceans and climate.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
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