10.5880/GFZ.4.3.2023.001 ISONET Project Members Schleser, Gerhard Hans Gerhard Hans Schleser 0000-0003-1794-5361 FZJ Research Center Jülich, Institute of Bio- and Geosciences, Agrosphere (IBG-3), Jülich, Germany Andreu-Hayles, Laia Laia Andreu-Hayles 0000-0003-4185-681X Tree Ring Lab, Lamont-Doherty Earth Observatory of Columbia University, Palisades NY, United States Bednarz, Zdzislaw Zdzislaw Bednarz Department of Forest Biodiversity, Agricultural University, Krakow, Poland Berninger, Frank Frank Berninger 0000-0001-7718-1661 Faculty of Science and Forestry, Department of Environmental and Biological Sciences, Joensuu, Finland Boettger, Tatjana Tatjana Boettger Department of Isotope Hydrology, Helmholtz Centre for Environmental Research - UFZ, Halle, Germany Dorado-Liñán, Isabel Isabel Dorado-Liñán 0000-0002-8913-0420 Universidad Politecnica de Madrid, Forest Genet & Ecophysiol Res Grp, Ciudad Univ S-N, Madrid, Spain Esper, Jan Jan Esper 0000-0003-3919-014X Johannes Gutenberg University of Mainz, Department of Geography, Mainz, Germany Grabner, Michael Michael Grabner 0000-0002-5220-721X Institute of Wood Technology and Renewable Materials, University of Natural Resources and Life Sciences - BOKU, Vienna, Austria Gutiérrez, Emilia Emilia Gutiérrez 0000-0002-6085-5700 Department of Biological Evolution, Ecology and Environmental Sciences, University of Barcelona, Barcelona, Spain Helle, Gerhard Gerhard Helle 0000-0001-9988-6638 GFZ German Research Centre for Geosciences, Potsdam, Germany Hilasvuori, Emmi Emmi Hilasvuori Laboratory of Chronology, University of Helsinki, Natural Resources Institute Finland (Luke), Helsinki, Finland Jugner, Högne Högne Jugner Laboratory of Chronology, University of Helsinki, Finnish Museum of Natural History, Helsinki, Finland Kalela-Brundin, Maarit Maarit Kalela-Brundin The Museum of Forestry, Lycksele, Sweden Krąpiec, Marek Marek Krąpiec Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, Krakow, Poland Leuenberger, Markus Markus Leuenberger 0000-0003-4299-6793 Physics Institute, Climate and Environmental (CEP), Bern, Switzerland Loader, Neil J. Neil J. Loader 0000-0002-6841-1813 Swansea University, Swansea, United Kingdom Masson-Delmotte, Valérie Valérie Masson-Delmotte 0000-0001-8296-381X Laboratory for Climate and Environmental Sciences, CEA/CNRS, UVSQ, Gif-sur-Yvette, France Pawełczyk, Sławomira Sławomira Pawełczyk Department of Radioisotopes, Silesian University of Technology, Gliwice, Poland Pazdur, Anna Anna Pazdur 0000-0002-6078-798X Department of Radioisotopes, Silesian University of Technology, Gliwice, Poland Pukienė, Rūtilė Rūtilė Pukienė 0000-0002-9785-0321 The State Scientific Research Institute Nature Research Centre, Vilnius, Lithuania Rinne-Garmston, Katja T. Katja T. Rinne-Garmston 0000-0001-9793-2549 Natural Resources Institute Finland (Luke), Helsinki, Finland Saracino, Antonio Antonio Saracino 0000-0002-1499-2317 Università degli Studi di Napoli Federico II, IT-Portici (Naples), Italy Saurer, Matthias Matthias Saurer 0000-0002-3954-3534 Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland Sonninen, Eloni Eloni Sonninen Laboratory of Chronology, University of Helsinki, Natural Resources Institute Finland (Luke), Helsinki,Finland Stiévenard, Michel Michel Stiévenard Laboratory for Climate and Environmental Sciences, CEA/CNRS, UVSQ, Gif-sur-Yvette, France Switsur, Vincent R. Vincent R. Switsur Department of Biomedical and Forensic Science, Anglia Ruskin University, Cambridge, UK Szychowska-Krąpiec, Elżbieta Elżbieta Szychowska-Krąpiec 0000-0003-0809-8084 Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, Krakow, Poland Szczepanek, M. M. Szczepanek Institute of Physics, Silesian University of Technology, Gliwice, Poland Todaro, Luigi Luigi Todaro 0000-0001-7230-2188 School of Agricultural, Forest, Food and Environmental Sciences, University of Basilicata, Potenza, Italy Treydte, Kerstin Kerstin Treydte 0000-0001-8399-6517 Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland Vitas, Adomas Adomas Vitas 0000-0003-2868-7337 Environmental Research Centre, Vytautas Magnus University, Kaunas, Lithuania Waterhouse, John S. John S. Waterhouse Department of Biomedical and Forensic Science, Anglia Ruskin University, Cambridge, United Kingdom Weigl-Kuska, Martin Martin Weigl-Kuska 0000-0003-4285-4090 Holzforschung Austria, Wien, Austria Wimmer, Rupert Rupert Wimmer 0000-0002-7023-6209 Institute of Wood Technology and Renewable Materials, University of Natural Resources and Life Sciences - BOKU, Vienna, Austria GFZ Data Services 2023 Schleser, Gerhard Hans Gerhard Hans Schleser 0000-0003-1794-5361 FZJ Research Center Jülich, Institute of Bio- and Geosciences, Agrosphere (IBG-3), Jülich, Germany Helle, Gerhard GFZ German Research Centre for Geosciences, Potsdam, Germany Dataset 10.1111/j.1365-2486.2010.02373.x 10.1007/s00382-016-3332-z 10.5194/cp-17-1005-2021 10.1007/s10584-008-9516-8 10.1038/nclimate2614 10.1016/j.agrformet.2017.05.005 10.1016/j.scitotenv.2017.12.229 10.5194/cp-12-1101-2016 10.1016/S0031-0182(03)00466-8 10.1007/s00382-004-0458-1 10.1007/s10584-009-9602-6 10.3402/tellusb.v56i2.16405 10.1016/j.gca.2010.01.021 10.1016/j.quascirev.2012.10.048 10.1111/gcb.12717 10.1111/geb.12933 10.1016/j.biocon.2007.03.010 10.1029/2007gl031106 10.1021/ac0700023 10.1029/98JD01169 10.1007/978-94-015-7879-0 10.1021/ed040pA394 10.1002/rcm.4105 10.1016/S0009-2541(96)00133-7 10.1016/j.chemgeo.2005.06.010 10.1016/j.gca.2010.01.021 10.1034/j.1600-0889.2001.530505.x 10.1021/i560137a021 10.5880/GFZ.4.3.2023.002 10.1038/s43247-022-00648-7 CC BY 4.0 24 European annually resolved stable isotope chronologies have been constructed from tree ring cellulose for the last 400 years (1600CE – 2003CE) for carbon and oxygen and for the last 100 years for hydrogen. Data was produced within the ISONET project (400 Years of Annual Reconstructions of European Climate Variability Using a Highly Resolved Isotopic Network,) to initiate an extensive spatiotemporal tree-ring stable isotope network across Europe funded as part of the fifth EC Framework Programme “Energy, Environment and Sustainable Development”. This data set comprises the ISONET δ18O records.
Wood increment cores of 15 or more Pinus sylvestris, Quercus robur/petraea or Cedrus atlantica tree individuals were taken. Dendro-dated tree-ring material of 4-5 individuals per site was dissected and pooled year by year. After cellulose extraction and homogenization, 18O/16O-ratios of annually resolved samples were determined by Isotope Ratio Mass Spectrometry (IRMS). Time series of 18O/16O are given as d-values versus SMOW. Details can be found in the downloadable “data description” file.

The ISONET project has been striving to improve greatly our understanding of European climate systems providing independent quantitative data for model verification and policy making. A network of 24 sites provides dendrochronological coverage from Iberia to Fennoscandia, Caledonia and the Tyrol. The stable isotope (C, H, O) ratios of these annually resolved time series shall be analysed within this project, to reconstruct past climate regimes (temperature, relative humidity and precipitation characteristics) for the last 400 years. Climate variability shall be addressed on three timescales; decade-century (source water/air mass dominance); inter-annual (quantifying baseline variability, extreme events and recent trends); and intra-annual (high resolution exploration of seasonality signals within tree-rings). ISONET goes far beyond existing tree-ring analyses in its spatial based investigation and interpretation (see also https://cordis.europa.eu/project/id/EVK2-CT-2002-00147).
Bromarv (BRO) Cavergno (CAV) Sierra de Cazorla (CAZ) Col de Zad (COL) Dransfeld (DRA) Fontainebleau (FON) Gutuli national Park (GUT) Sivakkovaara, Ilomantsi (ILO) Kessi, Insri (INS) Lainzer Tiergarten (LAI) Pinar de Lillo (PIL) Lochwood (LOC) Niepołomice Forest, Gibiel reserve (NIE1) Niepołomice Forest, Gibiel reserve (NIE2) Panemune (Panemunes silas) (PAN) Massis del Pedraforca (PED) Poellau (POE) Rennes (REN) Monte Pollino (SER) Suwałki (SUW) Vigera (VIG) Vinuesa (VIN) Windsor (WIN) Woburn (WOB) European Commission http://doi.org/10.13039/501100000780 EVK2-CT-2002-00147 ISONET