Journal
THEORETICAL AND APPLIED CLIMATOLOGY
Volume 107, Issue 1-2, Pages 131-141Publisher
SPRINGER WIEN
DOI: 10.1007/s00704-011-0468-y
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Funding
- CAS [2009S1-38, XDA05080801, 29082762]
- National Basic Research Program of China (973 Program) [2010CB950104]
- NNSF [07-05-92121-a]
- RFBR [09-05-00202-a]
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The technique of expanding meteorological fields on eigenvectors of the field covariation matrix is popular. In this paper, we propose for the first time to use a mathematically similar technique to solve the main problem of dendrochronology: classifying variations in tree-ring records as either age- and microenvironment-dependent or climate-induced. Applying this technique to a sample of very long-lived Qilian junipers (Sabina przewalskii Kom.) from the Dulan region in western China, we demonstrate that the ring-width variations projected on the first eigenvector are age-dependent, but those projected on several of the first subsequent vectors are mainly climate-induced. In particular, the second and third projections capture multi-centennial climatic variations, and the variations projected on the fourth through seventh eigenvectors show periodic variations that are probably induced by the 178-year solar cycle. The projections on the smallest eigenvectors seem to be negligible.
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