Common temperature signal in four well-replicated tree growth series from northern Fennoscandia
Article first published online: 19 SEP 2012
Copyright © 2012 John Wiley & Sons, Ltd.
Journal of Quaternary Science
Volume 27, Issue 8, pages 828–834, November 2012
How to Cite
Lindholm, M., Aalto, T., Grudd, H., Mccarroll, D., Ogurtsov, M. and Jalkanen, R. (2012), Common temperature signal in four well-replicated tree growth series from northern Fennoscandia. J. Quaternary Sci., 27: 828–834. doi: 10.1002/jqs.2575
- Issue published online: 14 NOV 2012
- Article first published online: 19 SEP 2012
- Manuscript Accepted: 12 JUL 2012
- Manuscript Revised: 11 JUL 2012
- Manuscript Received: 1 MAR 2012
- northern timberline;
- tree growth;
Four Nordic temperature proxies based on tree growth at the northern timberline – ring-width from Sweden and Finland, maximum latewood density from Sweden, and height increment from Finland – were compared. Three indexing methods were used to enhance the low (centennial and above), medium (decadal-to-multidecadal) and high (decadal-to-interannual) frequencies. The proxies are shown to have a strong temperature signal (common variance) at the interannual-to-multidecadal scale, while the multidecadal-to-centennial trends are less coherent, perhaps reflecting intra-regional differences in growing conditions but more likely due to the more noisy regional curve standardization method used to retain the longest trends. Various methods of combining the four proxy series were explored and tested by comparison with four long temperature records from northern Fennoscandia. Only relatively high-frequency, spline-indexed series produced consistently positive verification statistics as a reconstruction model for summer temperature using all four proxies. Copyright © 2012 John Wiley & Sons, Ltd.