Variations in Solar Activity Across the Spörer Minimum Based on Radiocarbon in Danish Oak

Alexandra Fogtmann-Schulz, Sabrina Gjødvad Kaiser Kudsk, Pernille Lærke Krantz Trant, Claudia Baittinger, Christoffer Karoff, Jesper Olsen, Mads Faurschou Knudsen

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Abstrakt

Several aspects concerning the origin and nature of grand solar minima remain unclear, andmore high-resolution10Be and14C records are needed to improve our understanding of these phenomena.Here, we report 137 new high-precision, annually resolved radiocarbon concentrations based on oak fromthe Danish dendrochronology. The new record covers a period (CE 1432–1578) that encompasses most ofthe penultimate grand solar minima known as the Spörer Minimum. A detailed comparison between theSpörer and Maunder (CE 1640–1720) minima shows that the Spörer Minimum is associated withenhancedΔ14C variability in a band centered around the 11-year Schwabe cycle from CE 1450 to 1479 andbetween CE 1545 and 1578, whereas little 11-year variability is observed from CE 1479 to 1539. In contrast,we only observe enhanced 11-year variability after the end of the Maunder Minimum at CE 1722–1744,which could indicate that the nature and origin of the two minima were different.
OriginalsprogEngelsk
TidsskriftGeophysical Research Letters
Vol/bind46
Udgave nummer15
Sider (fra-til)8617-8623
Antal sider7
ISSN0094-8276
DOI
StatusUdgivet - aug. 2019

Emneord

  • Spörer Minimum
  • Maunder Minimum
  • radiocarbon
  • grand solar minimum
  • tree rings
  • solar variability

Citationsformater

Fogtmann-Schulz, A., Gjødvad Kaiser Kudsk, S., Trant, P. L. K., Baittinger, C., Karoff, C., Olsen, J., & Knudsen, M. F. (2019). Variations in Solar Activity Across the Spörer Minimum Based on Radiocarbon in Danish Oak. Geophysical Research Letters, 46(15), 8617-8623. https://doi.org/10.1029/2019GL083537