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Proxy Data from Tree-ring Time Series for the Eleven-year Solar Cycle

Published online by Cambridge University Press:  25 April 2016

J.O. Murphy  and
T.T. Veblen
J.O. Murphy
Affiliation:
Victorian Institute of Earth and Planetary Sciences, Monash University, Clayton, VIC 3168
T.T. Veblen
Affiliation:
Department of Geography, University of Colorado, Boulder, Colorado, 80309-0260 , USA
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Abstract

Over past decades many attempts have been undertaken to detect a statistically significant 11-year variation in tree-ring widths and thereby provide direct evidence for the influence of solar cycle activity on growth. The data were generally associated with arid sites and were found to contain no signal of any consequence at the equivalent frequency. However, our recent analysis of a tree-ring chronology established from spruce trees growing at a very high sub-alpine site in Colorado, has revealed the presence of a dominant 11-year spectral periodicity over the last 200 years. These growth cycles could arise from temperature changes due to variations in insolation and climate or from variations in direct radiation within a specific band.

Type
Solar and Solar System
Information
Publications of the Astronomical Society of Australia , Volume 10 , Issue 1 , 1992 , pp. 64 - 67
Copyright
Copyright © Astronomical Society of Australia 1992

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