A critical evaluation of multi-proxy dendroclimatology in northern Finland
Article first published online: 16 NOV 2010
Copyright © 2010 John Wiley & Sons, Ltd.
Journal of Quaternary Science
Volume 26, Issue 1, pages 7–14, January 2011
How to Cite
McCarroll, D., Tuovinen, M., Campbell, R., Gagen, M., Grudd, H., Jalkanen, R., Loader, N. J. and Robertson, I. (2011), A critical evaluation of multi-proxy dendroclimatology in northern Finland. J. Quaternary Sci., 26: 7–14. doi: 10.1002/jqs.1408
- Issue published online: 19 JAN 2011
- Article first published online: 16 NOV 2010
- Manuscript Accepted: 20 MAR 2010
- Manuscript Revised: 3 MAR 2010
- Manuscript Received: 22 JUL 2008
- climate reconstruction;
- stable carbon isotopes;
- tree rings;
Twentieth-century summer (July–August) temperatures in northern Finland are reconstructed using ring widths, maximum density and stable carbon isotope ratios (δ13C) of Scots pine tree rings, and using combinations of these proxies. Verification is based on the coefficient of determination (r2), reduction of error (RE) and coefficient of efficiency (CE) statistics. Of the individual proxies, δ13C performs best, followed by maximum density. Combining δ13C and maximum density strengthens the climate signal but adding ring widths leads to little improvement. Blue intensity, an inexpensive alternative to X-ray densitometry, is shown to perform similarly. Multi-proxy reconstruction of summer temperatures from a single site produces strong correlations with gridded climate data over most of northern Fennoscandia. Since relatively few trees are required (<15) the approach could be applied to long sub-fossil chronologies where replication may be episodically low. Copyright © 2010 John Wiley & Sons, Ltd.