Multi-proxy crossdating extends the longest high-elevation tree-ring chronology from the Mediterranean |
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| Institution: | 1. Department of Geography, Johannes Gutenberg University, 55099 Mainz, Germany;2. Curt-Engelhorn-Centre of Archaeometry, D6, 3, 68159 Mannheim, Germany;3. Global Change Research Institute, Czech Academy of Sciences, 60300 Brno, Czech Republic;4. Department of Agrosystems and Bioclimatology, Mendel University, 61300 Brno, Czech Republic;5. Department of Geography, University of Cambridge, Cambridge CB2 3EN, UK;6. Department of Geography, Faculty of Science, Masaryk University, 61137 Brno, Czech Republic;7. Swiss Federal Research Institute (WSL), 8903 Birmensdorf, Switzerland;1. Tree-Ring Services, Oakraven Field Centre, Mitcheldean, Gloucestershire GL17 0EE, UK;2. Ancient Yew Group, UK;1. Department of Biology & Environment, Faculty of Natural Sciences, University of Haifa – Oranim, Tivon 36006, Israel;2. Department of Wood Science, Technical University in Zvolen, 96001 Zvolen, Slovakia;3. Department of Phytology, Technical University in Zvolen, 96001 Zvolen, Slovakia;1. Siberian Federal University, 660041 Krasnoyarsk, Russia;2. Swiss Federal Institute for Forest, Snow and Landscape Research WSL, CH-8903 Birmensdorf, Switzerland;3. V.N. Sukachev Institute of Forest SB RAS, Federal Research Centre, 660036 Krasnoyarsk, Russia;4. West-Siberian Department of the V.N. Sukachev Institute of Forest SB RAS, 630082 Novosibirsk, Russia;5. College of Life Sciences, Zhejiang University, Hangzhou 310058, China;6. School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China;1. Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, University of Campania \"L. Vanvitelli\", Via Vivaldi 43, 81100 Caserta, Italy;2. The Earth Institute, Tree-ring Laboratory, Lamont-Doherty Earth Observatory of Columbia University, 61 Route 9W, Palisades, NY 10964, USA;3. BIOGECO, INRA, University of Bordeaux, 33615 Pessac, France;4. Department for Innovation in Biological, Agro-Food and Forest Systems, University of Tuscia, Via de Lellis, 01100 Viterbo, Italy;1. Plant Anatomy and Dendrochronology Laboratory, Department of Biology, Federal University of Sergipe, Av. Marechal Rondon s/n, Rosa Elze, São Cristóvão, Sergipe 49100-000, Brazil;2. Department of Plant Biology, Institute of Biology, University of Campinas – UNICAMP, P.O. Box 6109, 13083-970 Campinas, SP, Brazil;1. Department of Earth and Environmental Systems, Indiana State University, Terre Haute, IN 47809, USA;2. Department of Forestry, Michigan State University, East Lansing, MI 48824, USA |
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| Abstract: | Annually precise dating is the cornerstone of dendrochronology. The accurate crossdating of relict wood is, however, frequently challenged during early chronology periods when sample replication is typically low. Here we present a multi-proxy approach in which stable carbon (δ13C) and radiocarbon (14C) isotope data are used to evaluate and correct dating errors in the early period of the longest high-elevation tree-ring chronology from the Mediterranean Basin. The record was initially developed using 878 tree-ring width (TRW) and 192 maximum latewood density (MXD) series from living and relict Bosnian pines (Pinus heldreichii) from Mt. Smolikas in Greece to reconstruct hydroclimate and temperature variability back to the 8th century. New annually resolved and non-pooled δ13C series now suggest a re-dating of first millennium relict pine samples during a period when sample replication was too low for proper TRW and/or MXD crossdating. The associated correction shifts the start of the Mt. Smolikas chronology from 575 back to 468 CE, a change independently confirmed by wiggle-matching annual 14C data along the 774/775 CE cosmic event. Our study demonstrates the importance of independent age validation for robust chronology development and shows how multi-proxy crossdating can improve dating success during periods of low sample replication. |
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| Keywords: | Bosnian pine Mt Smolikas Paleoclimate Radiocarbon isotopes Relict wood Tree-ring stable isotopes |
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