Projects per year
Abstract
Recently, a rapid increase in radiocarbon (14C) was observed in Japanese tree rings at AD 774/775. Various explanations for the anomaly have been offered, such as a supernova, a γ-ray burst, a cometary impact, or an exceptionally large Solar Particle Event (SPE). However, evidence of the origin and exact timing of the event remains incomplete. In particular, a key issue of latitudinal dependence of the 14C intensity has not been addressed yet. Here, we show that the event was most likely caused by the Sun and occurred during the spring of AD 774. Particularly, the event intensities from various locations show a strong correlation with the latitude, demonstrating a particle-induced 14C poleward increase, in accord with the solar origin of the event. Furthermore, both annual 14C data and carbon cycle modelling, and separate earlywood and latewood 14C measurements, confine the photosynthetic carbon fixation to around the midsummer.
Original language | English |
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Article number | 3495 |
Journal | Nature Communications |
Volume | 9 |
Issue number | 1 |
Number of pages | 8 |
ISSN | 2041-1723 |
DOIs | |
Publication status | Published - 28 Aug 2018 |
MoE publication type | A1 Journal article-refereed |
Bibliographical note
Correction:Nature communications 10, article number: 1292 (2019)
DOI: 10.1038/s41467-019-09214-w
Fields of Science
- 115 Astronomy, Space science
- FINNISH LAPLAND
- C-14
- ATMOSPHERE
- INCREASE
- BE-10
- RADIOCARBON
- TROPOPAUSE
- SIGNALS
- CARBON
- MODEL
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Plant physiology as palaeoenvironmental proxy: Amalgamation of mid and late Holocene tree-ring evidence from carbon isotopes and growth rates (CARATE)
Oinonen, M., Hilasvuori, E., Helama, S. & Mielikäinen, K.
31/10/2010 → …
Project: Research project
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QUANOMAL: Menneisyys numeroina - Ympäristöanomalioiden tutkimukset puun vuosilustojen kautta (QUANOMAL)
Oinonen, M., Uusitalo, J., Arppe, L., Nöjd, P., Mäkinen, H., Helama, S. & Timonen, M.
01/09/2015 → 31/08/2019
Project: Research project
Equipment
Activities
- 1 Oral presentation
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Talk at the international workshop
Markku Oinonen (Speaker)
28 Mar 2022Activity: Talk or presentation types › Oral presentation