Halistatt Cycle Subarctic Fennoscandian Temperature and Its Possible Link with Solar Activity

Abstract

Reconstruction of summer temperature at subarctic Fennoscandia (68°–70° N, 20°–30° E), based on tree-ring data, was compared with three solar activity reconstructions, obtained by means of ¹⁴C and ¹⁰Be. It was shown that temperature proxy reconstructs well both long-term and short-term temperature variability. Weak, but significant positive correlation between reconstructed temperature (Helama et al., 2010) averaged over 40 years, and solar proxies was found during BC 5495–AD 1895. It was shown that Hallstatt cyclicity (1800–2300 years) is the main common feature in temperature and solar proxies. Possible mechanisms of the solar–temperature link over subarctic Fennoscandia are discussed.