Quality Dating: A Well-Defined Protocol Implemented at ETH for High-Precision 14C-Dates Tested on Late Glacial Wood
Open accessAbstract
ABSTRACT Advances in accelerator mass spectrometry have resulted in an unprecedented amount of new high-precision radiocarbon ( 14 C) -dates, some of which will redefine the international 14 C calibration curves (IntCal and SHCal). Often these datasets are unaccompanied by detailed quality insurances in place at the laboratory, questioning whether the 14 C structure is real, a result of a laboratory variation or measurement-scatter. A handful of intercomparison studies attempt to elucidate laboratory offsets but may fail to identify measurement-scatter and are often financially constrained. Here we introduce a protocol, called Quality Dating, implemented at ETH-Zürich to ensure reproducible and accurate high-precision 14 C-dates. The protocol highlights the importance of the continuous measurements and evaluation of blanks, standards, references and replicates. This protocol is tested on an absolutely dated German Late Glacial tree-ring chronology, part of which is intercompared with the Curt Engelhorn-Center for Archaeometry, Mannheim, Germany (CEZA). The combined dataset contains 170 highly resolved, highly precise 14 C-dates that supplement three decadal dates spanning 280 cal. years in IntCal, and provides detailed 14 C structure for this interval.
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Self-citation
- Authors
- Sookdeo, A., Kromer, B., Büntgen, U., Friedrich, M., Friedrich, R., Helle, G., Pauly, M., Nievergelt, D., Reinig, F., Treydte, K., Synal, H.-A., & Wacker, L.
- Affiliations
- ETH Zurich (CH)
- Heidelberg University (DE)
- University of Cambridge (GB)
- University of Hohenheim (DE)
- Reiss Engelhorn Museum (DE)
- GFZ Helmholtz Centre for Geosciences (DE)
- Swiss Federal Institute for Forest, Snow and Landscape Research (CH)
- Corresponding author
- Sookdeo, Adam
- ORCID
- Venue
- Radiocarbon
- Publisher
- Cambridge University Press (CUP)
- Published
- 2019-11-18
- Volume
- 62
- Issue
- 4
- Pages
- 891-899
- ISSN
- 0033-8222 (ISSN-L)
- 1945-5755
- OpenAlex
- W2985768960
- Cited by
- 44
- References
- 31
- Citations by year
- 2026: 5 · 2025: 8 · 2024: 5 · 2023: 3 · 2022: 3 · 2021: 9 · 2020: 11
- FWCI
- 4.76
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Radiocarbon (publishedVersion, cc-by-nc-sa)
- Research Space (acceptedVersion)
- DORA WSL (Swiss Federal Institute for Forest, Snow and Landscape Research) (submittedVersion, cc-by-nc-sa)
- Publication Database GFZ (GFZ German Research Centre for Geosciences) (submittedVersion, other-oa)
- Publication Database GFZ (GFZ German Research Centre for Geosciences) (submittedVersion, cc-by-nc-sa)
- Repository for Publications and Research Data (ETH Zurich) (submittedVersion, cc-by-nc-sa)
- ETH Zürich Research Collection
- Funders
- National Science Foundation
- Deutsche Forschungsgemeinschaft
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (157187, 200021L)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Archaeology and ancient environmental studies
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Tree-ring climate responses
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
- Keywords
- Late Glacial, tree-ring chronology, radiocarbon calibration, measurement scatter, intercomparison, accelerator mass spectrometry
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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