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  Eleven-year solar cycles over the last millennium revealed by radiocarbon in tree rings

Brehm, N., Bayliss, A., Christl, M., Synal, H.-A., Adolphi, F., Beer, J., et al. (2021). Eleven-year solar cycles over the last millennium revealed by radiocarbon in tree rings. Nature Geoscience, 14(1), 10-15. doi:10.1038/s41561-020-00674-0.

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 Creators:
Brehm, Nicolas, Author
Bayliss, Alex, Author
Christl, Marcus, Author
Synal, Hans-Arno, Author
Adolphi, Florian, Author
Beer, Juerg, Author
Kromer, Bernd, Author
Muscheler, Raimund, Author
Solanki, Sami K.1, Author              
Usoskin, Ilya, Author
Bleicher, Niels, Author
Bollhalder, Silvia, Author
Tyers, Cathy, Author
Wacker, Lukas, Author
Affiliations:
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              

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Free keywords: Geochemistry Palaeoclimate Solar physics
 Abstract: The Sun provides the principal energy input into the Earth system and solar variability represents a significant external climate forcing. Although observations of solar activity (sunspots) cover only the last about 400 years, radionuclides produced by cosmic rays and stored in tree rings or ice cores serve as proxies for solar activity extending back thousands of years. However, the presence of weather-induced noise or low temporal resolution of long, precisely dated records hampers cosmogenic nuclide-based studies of short-term solar variability such as the 11-yr Schwabe cycle. Here we present a continuous, annually resolved atmospheric C-14 concentration (fractionation-corrected ratio of (CO2)-C-14 to CO2) record reconstructed from absolutely dated tree rings covering nearly all of the last millennium (ad 969-1933). The high-resolution and precision C-14 record reveals the presence of the Schwabe cycle over the entire time range. The record confirms the ad 993 solar energetic particle event and reveals two new candidates (ad 1052 and ad 1279), indicating that strong solar events that might be harmful to modern electronic systems probably occur more frequently than previously thought. In addition to showing decadal-scale solar variability over the last millennium, the high-temporal-resolution record of atmospheric radiocarbon also provides a useful benchmark for making radiocarbon dating more accurate over this interval. 11-year solar cycles consistently occurred throughout the last thousand years, according to a synthesis of annually resolved tree ring radiocarbon records from central Europe.

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Language(s): eng - English
 Dates: 2021
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41561-020-00674-0
 Degree: -

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Title: Nature Geoscience
  Abbreviation : Nat. Geosci.
Source Genre: Journal
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Affiliations:
Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 14 (1) Sequence Number: - Start / End Page: 10 - 15 Identifier: ISSN: 1752-0894
CoNE: https://pure.mpg.de/cone/journals/resource/1752-0894