TY - JOUR
T1 - Chronomics of climatic variations of tree ring width
AU - Otsuka, K.
AU - Cornelissen-Guillaume, Germaine G
AU - Halberg, F.
PY - 2010
Y1 - 2010
N2 - Variations in the average annual tree rings of 11 sequoia trees for 2189 years are studied. The power spectrum of tree ring variations, calculated by the Maximum Entropy Method (MEM), is power-law in character with the coefficient β close to -1.00, suggesting the fractal character of the considered time series. The calculations of the coefficient β in a 200-year sliding window showed that this coefficient rapidly drops to zero or very small positive values, indicating a break in the fractal structure in some intervals. We identified seven such episodes, two (the latest) of which correspond to Spörer and Maunder solar minima. The other five episodes, which occurred around 100 BC and 500, 700, 820, and 880 AD, i.e., before regular sunspot observations, may also correspond to climate changes. By combining methods aimed at identifying the specific spectral components, such as the Schwabe cycle and behavior of the 1/f dependence as a chaos characteristic, the chronobiologic (chronomics) approach can be used to study the global climatic processes-such as cycles of about 500 years-bearing on global warming.
AB - Variations in the average annual tree rings of 11 sequoia trees for 2189 years are studied. The power spectrum of tree ring variations, calculated by the Maximum Entropy Method (MEM), is power-law in character with the coefficient β close to -1.00, suggesting the fractal character of the considered time series. The calculations of the coefficient β in a 200-year sliding window showed that this coefficient rapidly drops to zero or very small positive values, indicating a break in the fractal structure in some intervals. We identified seven such episodes, two (the latest) of which correspond to Spörer and Maunder solar minima. The other five episodes, which occurred around 100 BC and 500, 700, 820, and 880 AD, i.e., before regular sunspot observations, may also correspond to climate changes. By combining methods aimed at identifying the specific spectral components, such as the Schwabe cycle and behavior of the 1/f dependence as a chaos characteristic, the chronobiologic (chronomics) approach can be used to study the global climatic processes-such as cycles of about 500 years-bearing on global warming.
KW - Chronoastrobiology
KW - Fractal scaling (1/f dependence)
KW - Spörer and Maunder minima of solar activity
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U2 - 10.1134/S0001433810070042
DO - 10.1134/S0001433810070042
M3 - Article
AN - SCOPUS:78650621452
SN - 0001-4338
VL - 46
SP - 838
EP - 843
JO - Izvestiya - Atmospheric and Ocean Physics
JF - Izvestiya - Atmospheric and Ocean Physics
IS - 7
ER -