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Trends in twentieth-century tree growth at high elevations in the Sierra Nevada and White Mountains, USABig Sky Institute, Montana State University, Bozeman MT, USA; abunn{at}whrc.org
Big Sky Institute, Montana State University, Bozeman MT, USA
Nicholas School of the Environment and Earth Sciences, Duke University, Durham NC, USA
We analysed a multispecies tree-ring data base to assess the degree to which twentieth-century growth trends reflect tree growth of the last millennium. We examined
Key Words: Global warming • dendrochronology • paleoclimatology • Sierra Nevada • ordination • cluster analysis • late Holocene
The Holocene, Vol. 15, No. 4,
481-488 (2005) This article has been cited by other articles:
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1000-yr chronologies for five species of high-elevation conifers at 13 sites in western North America. Using non-parametric ordination and cluster analysis, we decomposed the variability at annual to decadal timescales into two dimensions, both of which are significantly correlated to temperature and precipitation variation. Tree-ring sites map onto the ordination axes according to species and relative position on the landscape. A spectral analysis of the ordination axes indicates a secular trend and significant quasi-periodic variation on scales of years to decades. Further, we find that the pattern of high-elevation conifer growth rates during the last half of the twentieth century are different than any time in the past 1000 years, indicating a distinct biological signature of global climate change. 
