Computer Science
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.307..141s&link_type=abstract
Nature (ISSN 0028-0836), vol. 307, Jan. 12, 1984, p. 141-143.
Computer Science
34
Atmospheric Effects, Carbon 14, Dendrochronology, Secular Variations, Solar Activity Effects, Timber Vigor, Carbon Dioxide, Climatology, Data Correlation, Fast Fourier Transformations, Maximum Entropy Method, Power Spectra, Spectral Correlation, Trees (Plants)
Scientific paper
An unusually convincing correlation is shown between variations of cosmic ray-produced C-14 activity of the CO2 in the terrestrial atmosphere during the past five millenia and annual growth ring widths for bristlecone pine wood from Campito Mountain in eastern California. The correlation is based on power spectral densities (PSDs) and cross-covariance. The PSDs are computed using the maximum entropy method, and major spectral features are also confirmed using the Yule-Walker algorithm and the fast Fourier transform. The results suggest that a forcing function is present which mediates both the atmospheric C-14 level and tree growth.
Sonett Charles P.
Suess Hans E.
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