To investigate the possible Sun-climate connection during the Holocene, the Finnish super-long tree-ring chronology covering the period from 5634 BC and 2004 AD is analyzed. As indicator of solar activity we use a reconstruction of total solar irradiance (TSI) covering 9300 years which is based on a composite using the cosmogenic radionuclide Be^10 measured in polar ice cores, and also on neutron monitor data (Steinhilber et al. 2009). The MTM, wavelet decomposition and wavelet coherence analysis were applied to the time series. MTM spectral analysis identifies the main solar cycles at ca. 200 yr (de Vries or Suess), ca. 350 yr (unnamed) and ca. 900 yr (Eddy). The strongest cross-wavelet correlation was discovered between the millennium-cycle components of TSI and tree-ring width variations. This Eddy cycle, which was recently discovered in solar activity, remains both strong and stable through almost the entire Holocene, and it reappears again at lower (ca. 1300 years) frequencies since around AD 200 till now. Our results raise questions on the subject regarding the end of the Holocene and transition to the next glacial period and confirm the complex and nonlinear nature of the Sun-climate relationship during the Holocene epoch.

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2022
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