Abstract
Non-climatic trends in tree ring δ 13C series are investigated using highly replicated Pinus sylvestris δ 13C series from Finnish Lapland. The declining trend in stable carbon isotopes over the industrial period, reflecting changes in the isotopic ratio of atmospheric CO 2 is removed mathematically, without recourse to statistical de-trending. Regional Curve Standardisation (RCS) is then used to identify and remove the juvenile phase during which δ 13C values increase. The chronologies all show approximately 1‰ depletion in the juvenile phase, with an average rise of 0.029‰ year − 1 lasting for about 50 years, after which trees of very different cambial age capture common variance over the same chronological period. There is no evidence of long-term age-related trends and RCS provides an alternative to simply omitting the juvenile portion of the stable carbon isotope series, thus allowing greater sample depth to be retained.
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