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Advances towards improved low-frequency tree-ring reconstructions, using an updated Pinus sylvestris L. MXD network from the Scandinavian Mountains |
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| Authors: | Jesper A Björklund Björn E Gunnarson Paul J Krusic Håkan Grudd Torbjörn Josefsson Lars Östlund Hans W Linderholm |
| Institution: | 1. Regional Climate Group, Department of Earth Sciences, University of Gothenburg, Guldhedsgatan 5a, 41320, Gothenburg, Sweden 2. Bert Bolin Centre for Climate Research, Department of Physical Geography and Quaternary Geology, Stockholm University, 10691, Stockholm, Sweden 3. Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, 90183, Ume?, Sweden 4. Navarino Environmental Observatory, Messinia, Greece 5. Landscape Ecology Group, Department of Ecology and Environmental Science, Ume? University, Ume?, Sweden 6. Regional Climate Group, Department of Earth Sciences, University of Gothenburg, Guldhedsgatan 5a, 41320, Gothenburg, Sweden |
| Abstract: | The dendrochronological use of the parameter maximum density (MXD) in Pinus Sylvestris L., at high latitudes, has provided valuable insights into past summer temperature variations. Few long MXD chronologies, from climatically coherent regions, exist today, with the exception being in northern Europe. Five, 500-year-long, Fennoscandian, MXD chronologies were compared with regard to their common variability and climate sensitivity. They were used to test Signal-free standardization techniques, to improve inferences of low-frequency temperature variations. Climate analysis showed that, in accordance with previous studies on MXD in Fennoscandia, the summer temperature signal is robust (R 2?>?50 %) and reliable over this climatically coherent region. A combination of Individual standardization and regional curve standardization is recommended to refine long-term variability from these MXD chronologies and relieve problems arising from low replication and standardization end-effects. |
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