Climate response to de Vries solar cycles: evidence of Juniperus turkestanica tree rings in Central Asia
A manifestation of the two-hundred-year solar cycle (de Vries cyclicity) in climatic changes is considered. The consideration is based on analysis of radial growth of long-lived (800-1200 years) trees Juniperus turkestanica from Tien Shan mountains (Central Asia). Quasi-two-hundred-year oscillations in radial tree growth which correlate well (correlation coefficient is 0.82) with similar solar activity variations (Delta 14C) and the 200-year component of temperature variations in the Northern Hemisphere in the last millenium and also with quasi-two-hundred-year variations in climatic processes in Europe, North and South America, and Asia have been revealed. The results obtained point to the influence of the deVries solar activity periodicity on global climatic processes.
Memorie della Societa Astronomica Italiana
- Pub Date:
- Climate change;
- long-term solar activity;
- de Vries cyclicity