On The Possible Regional Distribution Of Ca 2.4 Kyr Climatic Cycle

A tree-ring proxy of summer temperature anomalies for northern Finland for the last 7500 years was analysed using both the Fourier and wavelet approaches. A distinct ca 2.0 Kyr periodicity was found in this temperature proxy. This variation is likely a manifestation of 2.0-2.5 Kyr Hallstattzeit cycle, present in many climatic records. Analysis showed that the Hallstattzeit climatic variation (period 2.0-2.5 Kyr) probably is not a global, common rhythm but has a spatial distribution. The origin and cause of this quasi 2.4 Kyr cycle is still unknown, however, some evidence of its possible connection with atmospheric dynamics were obtained