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Signal strength and climate relationships in 13 C/ 12 C ratios of tree ring cellulose from oak in southwest Finland
Author(s) -
Robertson I.,
Rolfe J.,
Switsur V. R.,
Carter A. H. C.,
Hall M. A.,
Barker A. C.,
Waterhouse J. S.
Publication year - 1997
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/97gl01293
Subject(s) - quercus robur , dendrochronology , dendroclimatology , forcing (mathematics) , environmental science , atmospheric sciences , radiative forcing , climate change , climatology , forestry , geology , biology , ecology , geography , paleontology
Annual oak ( Quercus robur L.) latewood δ 13 C values are presented for the period 1895–1994 for two sites with different hydrological characteristics in southwest Finland. No appreciable anthropogenic 13 C depletion was observed in the time‐series. δ 13 C indices record high‐frequency common forcing better than lower‐frequency forcing. High‐frequency fluctuations in the δ 13 C indices are highly correlated with climatic variables. Cross correlation analysis of tree ring δ 13 C indices and climate variables show that there is no significant difference (p < 0.01) in the climate response of tree ring δ 13 C indices between the two sites. This work demonstrates that significant climate signals are contained in isotopic measurements of trees whose ring‐widths contain little or no such information.