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Variations in tree ring stable isotope records from northern Finland and their possible connection to solar activity
Authors:Maxim Ogurtsov  Eloni Sonninen  Emmi Hilasvuori  Igor Koudriavtsev  Valentin Dergachev  Högne Jungner
Institution:1. Helmholtz-Centre Potsdam, GFZ German Research Centre for Geoscience, Section 5.2 Climate Dynamics and Landscape Evolution, 14473 Potsdam, Germany;2. FZJ Research Center Jülich, Institute of Bio- and Geosciences, Agrosphere (IBG-3), 52425 Jülich, Germany;3. Department of Physical Geography, University of Passau, Innstraße 40, 94032 Passau, Germany;4. FZJ Research Center Jülich, Institute for Energy and Climate Research, Stratosphere (IEK-7), 52425 Jülich, Germany;1. CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Yunnan 666303, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, China;4. State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;1. University of Louisiana at Lafayette, School of Geosciences, Lafayette, LA 70504, USA;2. University of Hawaii at Mānoa, International Pacific Research Center and Department of Oceanography, Honolulu, HI 96822, USA
Abstract:Within a project on climate in Europe during the past few hundred years we have collected a record on stable isotope ratios 13C/12C and 18O/16O in tree ring cellulose from pine trees in northern Finland. The records cover the time interval 1600–2002 AD and have an annual time resolution. The carbon stable isotope record from northernmost Finland correlates quite strongly with local growth period temperature. Statistical analysis of the carbon and oxygen stable isotope records reveals variations in the periods around 100, 11 and 3 years. A century scale connection between the 13C/12C record and solar activity is most evident. These results based on stable isotope records support previous evidences of a centennial solar-climatic link obtained for northern Finland using tree ring data.
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