Correlation of bristlecone pine ring widths with atmospheric C-14 variations - A climate-sun relation

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...

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Bibliographic Details
Published in:Nature (London) 1984-01, Vol.307, p.141-143
Main Authors: Sonett, C P, Suess, H E
Format: Article
Language:English
Online Access:Get full text
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Summary: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.
ISSN:0028-0836
DOI:10.1038/307141a0