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Brehm, Nicolas; Christl, Marcus; Knowles, Timothy; Casanova, Emanuelle; Everhed, Richard; Adolphi, Florian; Muscheler, Raimund; Synal, Hans-Arno; Mekhaldi, Florian; Paleari, Chiara Ileana; Leuschner, Hanns Hubert; Bayliss, Alex; Nicolussi, Kurt; Pilcher, Thomas; Pearson, Charlotte; Salzer, Matthew W; Fonti, Patrick; Nievergelt, Daniel; Hantmirov, Rashit; Brown, David J; Usoskin, Ilya; Wacker, Lukas (2022): Radiocarbon measurements on tree rings (7220-7122 BCE and 5300-5190 BCE) [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.941472

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Published: 2022-02-24 • DOI registered: 2022-03-29

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Abstract:
Accelerator mass spectrometer measurement results of C14 age in tree rings from 13 different dendrochronoligically dated trees from Ireland and the Alps, United states and Siberia, spanning from 7220-7122 BCE and 5300-5190 BCE.
The Sun sporadically produces eruptive events leading to intense fluxes of solar energetic particles (SEPs) that dramatically disrupt the near-Earth radiation environment. Such events have been directly studied for the last decades but little is known about the occurrence and magnitude of rare, extreme SEP events. Presently, a few events that produced measurable signals in cosmogenic radionuclides such as 14C, 10Be and 36Cl have been found. Analyzing annual 14C concentrations in tree-rings from Switzerland, Germany, Ireland, Russia, and the USA we discovered two spikes in atmospheric 14C corresponding to 7176 and 5259 BCE. The ~2% increases of atmospheric 14C recorded for both events exceed all previously known 14C peaks but after correction for the geomagnetic field, they are comparable to the largest event of this type discovered so far at 775 CE. These strong events serve as accurate time markers for the synchronization with floating tree-ring and ice core records and provide critical information on the previous occurrence of extreme solar events which threaten modern infrastructure.
Keyword(s):
C14; Radiocarbon; Tree ring
Supplement to:
Brehm, Nicolas; Christl, Marcus; Knowles, Timothy; Casanova, Emanuelle; Everhed, Richard; Adolphi, Florian; Muscheler, Raimund; Synal, Hans-Arno; Mekhaldi, Florian; Paleari, Chiara Ileana; Leuschner, Hanns Hubert; Bayliss, Alex; Nicolussi, Kurt; Pilcher, Thomas; Pearson, Charlotte; Salzer, Matthew W; Fonti, Patrick; Nievergelt, Daniel; Hantmirov, Rashit; Brown, David J; Usoskin, Ilya; Wacker, Lukas (in review): Tree-rings reveal two strong solar proton events in 7176 and 5259 BCE. Nature Communications
Coverage:
Median Latitude: 49.167000 * Median Longitude: -24.145455 * South-bound Latitude: 38.380000 * West-bound Longitude: -118.170000 * North-bound Latitude: 67.750000 * East-bound Longitude: 70.060000
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
11 datasets

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Datasets listed in this publication series

  1. Brehm, N; Christl, M; Knowles, T et al. (2022): Radiocarbon measurements on tree rings of tree L4756. https://doi.org/10.1594/PANGAEA.941471
  2. Brehm, N; Christl, M; Knowles, T et al. (2022): Radiocarbon measurements on tree rings of tree M49. https://doi.org/10.1594/PANGAEA.941442
  3. Brehm, N; Christl, M; Knowles, T et al. (2022): Radiocarbon measurements on tree rings of tree M234. https://doi.org/10.1594/PANGAEA.941443
  4. Brehm, N; Christl, M; Knowles, T et al. (2022): Radiocarbon measurements on tree rings of tree MWK-80-101B. https://doi.org/10.1594/PANGAEA.941462
  5. Brehm, N; Christl, M; Knowles, T et al. (2022): Radiocarbon measurements on tree rings of tree MWK85-05B. https://doi.org/10.1594/PANGAEA.941444
  6. Brehm, N; Christl, M; Knowles, T et al. (2022): Radiocarbon measurements on tree rings of tree Q2729, ETH. https://doi.org/10.1594/PANGAEA.941463
  7. Brehm, N; Christl, M; Knowles, T et al. (2022): Radiocarbon measurements on tree rings of tree Q2729, BRAMS. https://doi.org/10.1594/PANGAEA.941467
  8. Brehm, N; Christl, M; Knowles, T et al. (2022): Radiocarbon measurements on tree rings of tree Q2750, ETH. https://doi.org/10.1594/PANGAEA.941464
  9. Brehm, N; Christl, M; Knowles, T et al. (2022): Radiocarbon measurements on tree rings of tree Q2750, BRAMS. https://doi.org/10.1594/PANGAEA.941468
  10. Brehm, N; Christl, M; Knowles, T et al. (2022): Radiocarbon measurements on tree rings of tree Tsc-182. https://doi.org/10.1594/PANGAEA.941466
  11. Brehm, N; Christl, M; Knowles, T et al. (2022): Radiocarbon measurements on tree rings of tree ua1601. https://doi.org/10.1594/PANGAEA.941411