Solar activity imprints in tree ring width from Chile (1610–1991) |
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| Institution: | 1. Department of Environmental Genomics, Jiangsu Key Laboratory of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China;2. Department of Genetic Toxicology, The Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing, China;3. Core Laboratory, Nantong Tumor Hospital, Nantong, China;1. Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. College of Life Science, Northwest Agriculture and Forestry University, Yangling, Shaanxi 712100, China;4. Institute of Soil and Water Conservation, Northwest Agriculture and Forestry University, Yangling, Shaanxi 712100, China;7. School of Agriculture and Food Sciences, The University of Queensland, St Lucia 4072, Queensland, Australia;1. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA;2. Independent research scientists, Dublin, Ireland |
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| Abstract: | We have investigated the solar activity signal in tree ring data from two locations in Chile. The tree ring time series extended over a period of ～400 yr. Spectral and wavelet analysis techniques were employed. We have found evidence for the presence of the solar activity Schwabe (～11 yr), Hale (～22 yr), fourth-harmonic of the 208-yr Suess cycle (～52 yr) and Gleissberg (～80 yr) cycles. The Gleissberg cycle of tree ring data is in anti-phase with solar activity. Wavelet and cross-wavelet techniques revealed that the periods found are intermittent, possibly because solar activity signals observed in tree rings are mostly due to solar influence on local climate (rainfall, temperature, and cloud cover) where trees grow up. Further, cross-wavelet analysis between sunspot and tree ring time series showed that the cross power around the 11 yr solar cycle is more significant during periods of high solar activity (grand maximum) than during periods of low solar activity (grand minimum). As Glaciar Pio XI is practically at the Pacific Ocean level, the tree-ring response may be stronger due to the heating of the Pacific Ocean water following an increase of the solar radiation incidence rather than at the higher altitudes of Osorno region. |
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