Excursions in the 14C record at A.D. 774–775 in tree rings from Russia and America
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Abstract The calibration of radiocarbon dates by means of a master calibration curve has been invaluable to Earth, environmental and archeological sciences, but the fundamental reason for calibration is that atmospheric radiocarbon content varies because of changes in upper atmosphere production and global carbon cycling. Improved instrumentation has contributed to high‐resolution (interannual) radiocarbon activity measurements, which have revealed sudden and anomalous activity shifts previously not observed at the common resolution of 5–10 years of most of the calibration scale. One such spike has been recently reported from tree rings from Japan and then again in Europe at A.D. 774–775, for which we report here our efforts to both replicate its existence and determine its spatial extent using tree rings from larch at high latitude (northern Siberia) and bristlecone pine from lower latitude (the White Mountains of California). Our results confirm an abrupt ~ 15‰ 14C activity increase from A.D. 774 to 776, the size and now the hemispheric extent of which suggest that an extraterrestrial influence on radiocarbon production is most likely responsible.
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Many AMS 14C measurement series do not exhibit an unexpected older offset versus comparable samples measured by LLGPC.
“many AMS 14C measurement series do not exhibit such an unexpected older offset versus comparable samples measured by LLGPC (4, 40–42)”
From Mediterranean radiocarbon offsets and calendar dates for prehistory (2020) · cites this paper as [41]
We would have anticipated that the AA data on BCP and IrO should be similar to the IntCal datasets and the Hd GeO data, given the good agreement in other recent work between GeO and BCP and between GeO and IrO.
“We would therefore have anticipated that the AA data on BCP and IrO (13) should be similar to the IntCal datasets (1–4) and the Hd GeO data (38), given the good agreement in other recent work between GeO and BCP (40–42) and between GeO and IrO (1–4).”
From Mediterranean radiocarbon offsets and calendar dates for prehistory (2020) · cites this paper as [41]
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References 50 · Cited by 109
- Authors
- Jull, A. J. T., Panyushkina, I. P., Lange, T. E., Kukarskih, V. V., Myglan, V. S., Clark, K. J., Salzer, M. W., Burr, G. S., & Leavitt, S. W.
- Affiliations
- University of Arizona (US)
- Laboratory of Tree‐Ring Research University of Arizona Tucson Arizona USA
- Ural Branch of the Russian Academy of Sciences (RU)
- Department of Humanities Siberian Federal University Krasnoyarsk Russia
- Corresponding author
- Jull, A. J. Timothy
- ORCID
- Venue
- Geophysical Research Letters
- Publisher
- American Geophysical Union (AGU)
- Published
- 2014-04-25
- Volume
- 41
- Issue
- 8
- Pages
- 3004-3010
- ISSN
- 0094-8276 (ISSN-L)
- 1944-8007
- OpenAlex
- W1487506261
- Cited by
- 109
- References
- 50
- Citations by year
- 2026: 6 · 2025: 2 · 2024: 6 · 2023: 7 · 2022: 9 · 2021: 5 · 2020: 11 · 2019: 14 · 2018: 12 · 2017: 12 · 2016: 8 · 2015: 11 · 2014: 6
- FWCI
- 8.19
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Geophysical Research Letters (publishedVersion)
- UA Campus Repository (The University of Arizona) (acceptedVersion)
- Funders
- University of Arizona
- Magyar Tudományos Akadémia
- Topics
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Tree-ring climate responses
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Archaeology and ancient environmental studies
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
- Keywords
- tree rings, radiocarbon calibration, atmospheric radiocarbon, larch, bristlecone pine, Siberia, White Mountains, cosmic ray production, carbon-14
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