Wood14C Dating with AixMICADAS: Methods and Application to Tree-Ring Sequences from the Younger Dryas Event in the Southern French Alps
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The AixMICADAS facility is in part dedicated to research on radiocarbon (14 C) calibration by means of various archives. For this purpose, we are improving upon the capacity to accurately date subfossil wood. In the current study, nine chemical pretreatment protocols are tested on six wood samples of known ages. The optimization based on 14 C ages,13 C/12 C ratios, carbon % and overall mass yield % leads us to favor the acid-base-acid-bleaching pretreatment (ABA-B). This efficient method is shown to provide a residue of holocellulose with optimal blanks equivalent to an age of 51,300 14 C BP with a standard deviation of 1500 yr based on 25 analyses. The seven wood samples from the Sixth International Radiocarbon Intercomparison (SIRI) are then analyzed as a further verification of the accuracy of our method. As a first scientific contribution, we studied two tree-ring sequences from subfossil pines (Barb12 and Barb17) collected in the southern French Alps. New 14 C analyses were performed at high resolution (every third year) and are shown to agree well with results obtained previously by high precision β-counting on CO 2 from large samples at lower resolution for Barb17 and accelerator mass spectrometry (AMS) data for Barb12. The new 14 C series are then matched to the Kauri and YDB chronologies: the new sequence of Barb12-17 tentatively corresponds to the interval between 12,836 and 12,594 cal BP within the Younger Dryas cold period. The 14 C comparison between the Barb12-17 sequence from France and the Kauri sequence from New Zealand allows calculating the 14 C Inter-Hemispheric Gradient (IHG), with an average value of ca. 57 yr. The IHG stayed relatively high throughout the studied period. Interestingly, the IHG exhibits a transient maximum value (ca. 100 yr) during the period of rapid Δ 14 C rise (12,750–12,720 cal BP), a behavior that could be due to a delayed response of the Southern Hemisphere.
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The new positioning was reinforced by inclusion of single-year measurements of subfossil pine trees from the French Alps, which strengthen the curve for this period.
“This new positioning was reinforced by the inclusion of single-year measurements of subfossil pine trees from the French Alps (Capano et al. 2018, 2019 in this issue) which strengthen the curve for this period.”
From The IntCal20 Northern Hemisphere Radiocarbon Age Calibration Curve (0–55 cal kBP) (2020) · cites this paper as Capano et al. 2018
Materials and Methods says the southern French Alps pine rings were sampled at annual resolution, with every third ring analyzed. High-Resolution ¹⁴C Results says the new data supported more precise synchronization, and Conclusions and Perspectives describes Barb17 as important for connecting the YDB and CELM chronologies. The paper does not say these measurements were included in, or strengthened, a revised calibration curve; it describes the Barb12-17 dating as tentative. (LLM, conf=0.83)
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The IntCal20 Northern Hemisphere Radiocarbon Age Calibration Curve (0–55 cal kBP)
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“This new positioning was reinforced by the inclusion of single-year measurements of subfossil pine trees from the French Alps (Capano et al. 2018, 2019 in this issue) which strengthen the curve for this period.”
MethodSelf-citationIlluminating IntCal during the Younger Dryas
Reinig, F., Sookdeo, A., Esper, J., Friedrich, M., Guidobaldi, G., Helle, G., Kromer, B., Nievergelt, D., Pauly, M., Tegel, W., et al. (2020) · Radiocarbon · doi:10.1017/rdc.2020.15 · Cited by 18 · see citing works
Self-citation
- Authors
- Capano, M., Miramont, C., Guibal, F., Kromer, B., Tuna, T., Fagault, Y., & Bard, E.
- Affiliations
- Centre National de la Recherche Scientifique (FR)
- Heidelberg University (DE)
- Corresponding author
- Capano, Manuela
- Venue
- Radiocarbon
- Publisher
- Cambridge University Press (CUP)
- Published
- 2017-09-18
- Volume
- 60
- Issue
- 1
- Pages
- 51-74
- ISSN
- 0033-8222 (ISSN-L)
- 1945-5755
- OpenAlex
- W2755004264
- Cited by
- 37
- References
- 69
- Citations by year
- 2026: 2 · 2025: 1 · 2024: 5 · 2023: 1 · 2022: 2 · 2021: 13 · 2020: 7 · 2019: 4 · 2018: 2
- FWCI
- 2.53
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Radiocarbon (publishedVersion)
- HAL (submittedVersion, other-oa)
- Funders
- Equipex
- Agence Nationale de la Recherche (ANR-17-CE01-0001, ANR-10-EQPX-0024)
- 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
- subfossil wood, radiocarbon calibration, chemical pretreatment, tree-ring chronology, Younger Dryas, Southern French Alps, 13C/12C ratio
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