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1. Recent human-induced atmospheric drying across Europe unprecedented in the last 400 years

Author

Treydte, K., Liu, L., Padrón, R.S., Martínez-Sancho, E., Babst, F., Frank, D.C., Gessler, A., Kahmen, A., Poulter, B., Seneviratne, S.I., Stegehuis, A.I., Wilson, R., Andreu-Hayles, L., Bale, R., Bednarz, Z., Boettger, Tatjana, Berninger, F., Büntgen, U., Daux, V., Dorado-Liñán, I., Esper, J., Friedrich, M., Gagen, M., Grabner, M., Grudd, H., Gunnarsson, B.E., Gutiérrez, E., Hafner, P., Haupt, Marika, Hilasvuori, E., Heinrich, I., Helle, G., Jalkanen, R., Jungner, H., Kalela-Brundin, M., Kessler, A., Kirchhefer, A., Klesse, S., Krapiec, M., Levanič, T., Leuenberger, M., Linderholm, H.W., McCarroll, D., Masson-Delmotte, V., Pawelczyk, S., Pazdur, A., Planells, O., Pukiene, R., Rinne-Garmston, K.T., Robertson, I., Saracino, A., Saurer, M., Schleser, G.H., Seftigen, K., Siegwolf, R.T.W., Sonninen, E., Stievenard, M., Szychowska-Krapiec, E., Szymaszek, M., Todaro, L., Waterhouse, J.S., Weigl-Kuska, M., Weigt, R.B., Wimmer, R., Woodley, E.J., Vitas, A., Young, G., Loader, N.J., Treydte, K., Liu, L., Padrón, R.S., Martínez-Sancho, E., Babst, F., Frank, D.C., Gessler, A., Kahmen, A., Poulter, B., Seneviratne, S.I., Stegehuis, A.I., Wilson, R., Andreu-Hayles, L., Bale, R., Bednarz, Z., Boettger, Tatjana, Berninger, F., Büntgen, U., Daux, V., Dorado-Liñán, I., Esper, J., Friedrich, M., Gagen, M., Grabner, M., Grudd, H., Gunnarsson, B.E., Gutiérrez, E., Hafner, P., Haupt, Marika, Hilasvuori, E., Heinrich, I., Helle, G., Jalkanen, R., Jungner, H., Kalela-Brundin, M., Kessler, A., Kirchhefer, A., Klesse, S., Krapiec, M., Levanič, T., Leuenberger, M., Linderholm, H.W., McCarroll, D., Masson-Delmotte, V., Pawelczyk, S., Pazdur, A., Planells, O., Pukiene, R., Rinne-Garmston, K.T., Robertson, I., Saracino, A., Saurer, M., Schleser, G.H., Seftigen, K., Siegwolf, R.T.W., Sonninen, E., Stievenard, M., Szychowska-Krapiec, E., Szymaszek, M., Todaro, L., Waterhouse, J.S., Weigl-Kuska, M., Weigt, R.B., Wimmer, R., Woodley, E.J., Vitas, A., Young, G., and Loader, N.J.

Abstract

The vapor pressure deficit reflects the difference between how much moisture the atmosphere could and actually does hold, a factor that fundamentally affects evapotranspiration, ecosystem functioning, and vegetation carbon uptake. Its spatial variability and long-term trends under natural versus human-influenced climate are poorly known despite being essential for predicting future effects on natural ecosystems and human societies such as crop yield, wildfires, and health. Here we combine regionally distinct reconstructions of pre-industrial summer vapor pressure deficit variability from Europe’s largest oxygen-isotope network of tree-ring cellulose with observational records and Earth system model simulations with and without human forcing included. We demonstrate that an intensification of atmospheric drying during the recent decades across different European target regions is unprecedented in a pre-industrial context and that it is attributed to human influence with more than 98% probability. The magnitude of this trend is largest in Western and Central Europe, the Alps and Pyrenees region, and the smallest in southern Fennoscandia. In view of the extreme drought and compound events of the recent years, further atmospheric drying poses an enhanced risk to vegetation, specifically in the densely populated areas of the European temperate lowlands.

Published
2023

2. Stable carbon isotope ratios of tree-ring cellulose from the site network of the EU-Project ‘ISONET’

Author

ISONET Project Members, Schleser, G., Andreu-Hayles, L., Bednarz, Z., Berninger, F., Boettger, T., Dorado-Liñán, I., Esper, J., Grabner, M., Gutiérrez, E., Helle, G., Hilasvuori, E., Jugner, H., Kalela-Brundin, M., Krąpiec, M., Leuenberger, M., Loader, N., Masson-Delmotte, V., Pawełczyk, S., Pazdur, A., Pukienė, R., Rinne-Garmston, K., Saracino, A., Sauerer, M., Sonninen, E., Stiévenard, M., Switsur, V., Szychowska-Krąpiec, E., Szczepanek, M., Todaro, L., Treydte, K., Vitad, A., Waterhouse, J., Weigl-Kuska, M., and Wimmer, R.

Abstract

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 δ13C records.

Published
2023

3. Stable oxygen isotope ratios of tree-ring cellulose from the site network of the EU-Project ‘ISONET’

Author

ISONET Project Members, Schleser, G., Andreu-Hayles, L., Bednarz, Z., Berninger, F., Boettger, T., Dorado-Liñán, I., Esper, J., Grabner, M., Gutiérrez, E., Helle, G., Hilasvuori, E., Jugner, H., Kalela-Brundin, M., Krąpiec, M., Leuenberger, M., Loader, N., Masson-Delmotte, V., Pawełczyk, S., Pazdur, A., Pukienė, R., Rinne-Garmston, K., Saracino, A., Saurer, M., Sonninen, E., Stiévenard, M., Switsur, V., Szychowska-Krąpiec, E., Szczepanek, M., Todaro, L., Treydte, K., Vitas, A., Waterhouse, J., Weigl-Kuska, M., and Wimmer, R.

Abstract

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.

Published
2023

5. Water-use efficiency and transpiration across European forests during the Anthropocene

Author

Frank, D.C., Poulter, B., Saurer, M., Esper, J., Huntingford, C., Helle, G., Treydte, K., Zimmermann, N.E., Schleser, G.H., Ahlstrom, A., Ciais, P., Friedlingstein, P., Levis, S., Lomas, M., Sitch, S., Viovy, N., Andreu-Hayles, L., Bednarz, Z., Berninger, F., Boettger, T., D'Alessandro, C.M., Daux, V., Filot, M., Grabner, M., Gutierrez, E., Haupt, M., Hilasvuori, E., Jungner, H., Kalela-Brundin, M., Krapiec, M., Leuenberger, M., Loader, N.J., Marah, H., Masson-Delmotte, V., Pazdur, A., Pawelczyk, S., Pierre, M., Planells, O., Pukiene, R., Reynolds-Henne, C.E., Rinne, K.T., Saracino, A., Sonninen, E., Stievenard, M., Switsur, V.R., Szczepanek, M., Szychowska-Krapiec, E., Todaro, L., Waterhouse, J.S., Weigl, M., Frank, D.C., Poulter, B., Saurer, M., Esper, J., Huntingford, C., Helle, G., Treydte, K., Zimmermann, N.E., Schleser, G.H., Ahlstrom, A., Ciais, P., Friedlingstein, P., Levis, S., Lomas, M., Sitch, S., Viovy, N., Andreu-Hayles, L., Bednarz, Z., Berninger, F., Boettger, T., D'Alessandro, C.M., Daux, V., Filot, M., Grabner, M., Gutierrez, E., Haupt, M., Hilasvuori, E., Jungner, H., Kalela-Brundin, M., Krapiec, M., Leuenberger, M., Loader, N.J., Marah, H., Masson-Delmotte, V., Pazdur, A., Pawelczyk, S., Pierre, M., Planells, O., Pukiene, R., Reynolds-Henne, C.E., Rinne, K.T., Saracino, A., Sonninen, E., Stievenard, M., Switsur, V.R., Szczepanek, M., Szychowska-Krapiec, E., Todaro, L., Waterhouse, J.S., and Weigl, M.

Published
2015

6. Water-use efficiency and transpiration across European forests during the Anthropocene

Author

Frank, D. C., primary, Poulter, B., additional, Saurer, M., additional, Esper, J., additional, Huntingford, C., additional, Helle, G., additional, Treydte, K., additional, Zimmermann, N. E., additional, Schleser, G. H., additional, Ahlström, A., additional, Ciais, P., additional, Friedlingstein, P., additional, Levis, S., additional, Lomas, M., additional, Sitch, S., additional, Viovy, N., additional, Andreu-Hayles, L., additional, Bednarz, Z., additional, Berninger, F., additional, Boettger, T., additional, D‘Alessandro, C. M., additional, Daux, V., additional, Filot, M., additional, Grabner, M., additional, Gutierrez, E., additional, Haupt, M., additional, Hilasvuori, E., additional, Jungner, H., additional, Kalela-Brundin, M., additional, Krapiec, M., additional, Leuenberger, M., additional, Loader, N. J., additional, Marah, H., additional, Masson-Delmotte, V., additional, Pazdur, A., additional, Pawelczyk, S., additional, Pierre, M., additional, Planells, O., additional, Pukiene, R., additional, Reynolds-Henne, C. E., additional, Rinne, K. T., additional, Saracino, A., additional, Sonninen, E., additional, Stievenard, M., additional, Switsur, V. R., additional, Szczepanek, M., additional, Szychowska-Krapiec, E., additional, Todaro, L., additional, Waterhouse, J. S., additional, and Weigl, M., additional

Published
2015
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7. Spatial variability and temporal trends in water-use efficiency of European forests

Author

Saurer, M., Spahni, R., Frank, D.C., Joos, F., Leuenberger, M., Loader, N.J., McCarroll, D., Gagen, M., Poulter, B., Siegwolf, R.T.W., Andreu-Hayles, L., Boettger, Tatjana, Dorado Liñán, I., Fairchild, I.J., Friedrich, M., Gutierrez, E., Haupt, Marika, Hilasvuori, E., Heinrich, I., Helle, G., Grudd, H., Jalkanen, R., Levanič, T., Linderholm, H.W., Robertson, I., Sonninen, E., Treydte, K., Waterhouse, J.S., Woodley, E.J., Wynn, P.M., Young, G.H.F., Saurer, M., Spahni, R., Frank, D.C., Joos, F., Leuenberger, M., Loader, N.J., McCarroll, D., Gagen, M., Poulter, B., Siegwolf, R.T.W., Andreu-Hayles, L., Boettger, Tatjana, Dorado Liñán, I., Fairchild, I.J., Friedrich, M., Gutierrez, E., Haupt, Marika, Hilasvuori, E., Heinrich, I., Helle, G., Grudd, H., Jalkanen, R., Levanič, T., Linderholm, H.W., Robertson, I., Sonninen, E., Treydte, K., Waterhouse, J.S., Woodley, E.J., Wynn, P.M., and Young, G.H.F.

Abstract

The increasing carbon dioxide (CO2) concentration in the atmosphere in combination with climatic changes throughout the last century are likely to have had a profound effect on the physiology of trees: altering the carbon and water fluxes passing through the stomatal pores. However, the magnitude and spatial patterns of such changes in natural forests remain highly uncertain. Here, stable carbon isotope ratios from a network of 35 tree-ring sites located across Europe are investigated to determine the intrinsic water-use efficiency (iWUE), the ratio of photosynthesis to stomatal conductance from 1901–2000. The results were compared with simulations of a dynamic vegetation model (LPX-Bern 1.0) that integrates numerous ecosystem and land–atmosphere exchange processes in a theoretical framework. The spatial pattern of tree-ring derived iWUE of the investigated coniferous and deciduous species and the model results agreed significantly with a clear south-to-north gradient, as well as a general increase in iWUE over the 20th century. The magnitude of the iWUE increase was not spatially uniform, with the strongest increase observed and modelled for temperate forests in Central Europe, a region where summer soil-water availability decreased over the last century. We were able to demonstrate that the combined effects of increasing CO2 and climate change leading to soil drying have resulted in an accelerated increase of iWUE. These findings will help to reduce uncertainties in the land surface schemes of global climate models, where vegetation–climate feedbacks are currently still poorly constrained by observational data.

Published
2014

10. Climate signals in the European isotope network ISONET

Author

Haneca, K., Verheyden, A., Beeckman, H., Gärtner, H., Treydte, K., Schleser, G.H., Esper, J., Andreu, L., Bednarz, Z., Berninger, F., Böttger, Tatjana, D'Allessandro, C.D., Etien, N., Filot, M., Frank, D., Grabner, M., Gutierrez, E., Haupt, Marika, Hell, G., Hilasvuori, E., Jungner, H., Kalela-Brundin, M., Leuenberger, M., Loader, N., Masson-Delmotte, V., Pazdur, A., Planells, O., Pukiene, R., Reynolds, C., Rinne, K., Saurer, M., Sonninen, E., Stievenard, M., Switsur, R., Szczepanek, M., Todaro, L., Waterhouse, J., Weigl, M., Wimmer, R., Haneca, K., Verheyden, A., Beeckman, H., Gärtner, H., Treydte, K., Schleser, G.H., Esper, J., Andreu, L., Bednarz, Z., Berninger, F., Böttger, Tatjana, D'Allessandro, C.D., Etien, N., Filot, M., Frank, D., Grabner, M., Gutierrez, E., Haupt, Marika, Hell, G., Hilasvuori, E., Jungner, H., Kalela-Brundin, M., Leuenberger, M., Loader, N., Masson-Delmotte, V., Pazdur, A., Planells, O., Pukiene, R., Reynolds, C., Rinne, K., Saurer, M., Sonninen, E., Stievenard, M., Switsur, R., Szczepanek, M., Todaro, L., Waterhouse, J., Weigl, M., and Wimmer, R.

Published
2007

11. Signal strength and climate calibration of a European tree-ring isotope network

Author

Treydte, K., Frank, D., Esper, J., Andreu, L., Bednarz, Z., Berninger, F., Böttger, Tatjana, D'Alessandro, C.M., Etien, N., Filot, M., Grabner, M., Guillemin, M.T., Gutierrez, E., Haupt, Marika, Helle, G., Hilasvuori, E., Jungner, H., Kalela-Brundin, M., Krapiec, M., Leuenberger, M., Loader, N.J., Masson-Delmotte, V., Pazdur, A., Pawelczyk, S., Pierre, M., Planells, O., Pukiene, R., Reynolds-Henne, C.E., Rinne, K.T., Saracino, A., Saurer, M., Sonninen, E., Stievenard, M., Switsur, V.R., Szczepanek, M., Szychowska-Krapiec, E., Todaro, L., Waterhouse, J.S., Weigl, M., Schleser, G.H., Treydte, K., Frank, D., Esper, J., Andreu, L., Bednarz, Z., Berninger, F., Böttger, Tatjana, D'Alessandro, C.M., Etien, N., Filot, M., Grabner, M., Guillemin, M.T., Gutierrez, E., Haupt, Marika, Helle, G., Hilasvuori, E., Jungner, H., Kalela-Brundin, M., Krapiec, M., Leuenberger, M., Loader, N.J., Masson-Delmotte, V., Pazdur, A., Pawelczyk, S., Pierre, M., Planells, O., Pukiene, R., Reynolds-Henne, C.E., Rinne, K.T., Saracino, A., Saurer, M., Sonninen, E., Stievenard, M., Switsur, V.R., Szczepanek, M., Szychowska-Krapiec, E., Todaro, L., Waterhouse, J.S., Weigl, M., and Schleser, G.H.

Abstract

We present the first European network of tree ring d 13C and d 18O, containing 23 sites from Finland to Morocco. Common climate signals are found over broad climatic-ecological ranges. In temperate regions we find positive correlations with summer maximum temperatures and negative correlations with summer precipitation and Palmer Drought Severity Indices (PDSI) with no obvious species-specific differences. Regional d 13C and d 18O chronologies share high common variance in year-to-year variations. Long-term variations, however, exhibit differences that may reflect spatial variability in environmental forcings, age trends and/or plant physiological responses to increasing atmospheric CO2 concentration. Rotated principal component analysis (RPCA) and climate field correlations enable the identification of four sub-regions in the d 18O network - northern and eastern Central Europe, Scandinavia and the western Mediterranean. Regional patterns in the d 13C network are less clear and are timescale dependent. Our results indicate that future reconstruction efforts should concentrate on d 18O data in the identified European regions.

Published
2007

13. Signal strength and climate calibration of a European tree‐ring isotope network

Author

Treydte, K., primary, Frank, D., additional, Esper, J., additional, Andreu, L., additional, Bednarz, Z., additional, Berninger, F., additional, Boettger, T., additional, D'Alessandro, C. M., additional, Etien, N., additional, Filot, M., additional, Grabner, M., additional, Guillemin, M. T., additional, Gutierrez, E., additional, Haupt, M., additional, Helle, G., additional, Hilasvuori, E., additional, Jungner, H., additional, Kalela‐Brundin, M., additional, Krapiec, M., additional, Leuenberger, M., additional, Loader, N. J., additional, Masson‐Delmotte, V., additional, Pazdur, A., additional, Pawelczyk, S., additional, Pierre, M., additional, Planells, O., additional, Pukiene, R., additional, Reynolds‐Henne, C. E., additional, Rinne, K. T., additional, Saracino, A., additional, Saurer, M., additional, Sonninen, E., additional, Stievenard, M., additional, Switsur, V. R., additional, Szczepanek, M., additional, Szychowska‐Krapiec, E., additional, Todaro, L., additional, Waterhouse, J. S., additional, Weigl, M., additional, and Schleser, G. H., additional

Published
2007
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14. ON THE EVE OF URBANIZATION: BAYESIAN MODEL DATING FOR MEDIEVAL TURKU.

Author

Oinone, M., Hilasvuori, E., Mehtonen, H., Uotila, K., and Zetterberg, P.

Subjects
RADIOCARBON dating, URBANIZATION, DENDROCHRONOLOGY, CARBON isotopes, ATMOSPHERIC carbon dioxide, BAYESIAN analysis
Abstract

The era of early urbanization in Finland coincides with large variations in the atmospheric radiocarbon concentration around the 13th-14th centuries AD. Therefore, the uncertainties of an individual 14C date are too large to support studies of this time period effectively. In this work, we have employ tree-ring wiggle-matching methodology and used Bayesian modeling of dates to account for stratigraphical a priori information within Aboa Vetus Museum, Turku, Finland. The wiggle-match method helps significantly to overcome the calibration-curve-induced challenges within 14C dating. The results of the dating model agree with the typological dates of the archaeological finds and illustrate a gradual evolution of urbanization in one of the oldest cities in Finland. [ABSTRACT FROM AUTHOR]

Published
2013

15. Spatio‐temporal patterns of tree growth as related to carbon isotope fractionation in European forests under changing climate

Author

Michael Grabner, Tatjana Boettger, Sławomira Pawełczyk, Marika Haupt, V. R. Switsur, Adomas Vitas, Christina E. Reynolds-Henne, Michel Stievenard, Marek Krąpiec, Luigi Todaro, Neil J. Loader, Eloni Sonninen, Gerhard H. Schleser, Martin Weigl, Monique Pierre, Katja Rinne-Garmston, David Frank, Matthias Saurer, Isabel Dorado-Liñán, Malgorzata Szymaszek, Laia Andreu-Hayles, Tatiana A. Shestakova, Gerhard Helle, Markus Leuenberger, M. Filot, Hamid Marah, Emmi Hilasvuori, John S. Waterhouse, Kerstin Treydte, Anna Pazdur, Antonio Saracino, Jordi Voltas, Valérie Masson-Delmotte, Jan Esper, Rupert Wimmer, Valérie Daux, Zdzisław Bednarz, Högne Jungner, Octavi Planells, Maarit Kalela‐Brundin, Rūtilė Pukienė, Angelo Rita, Frank Berninger, Emilia Gutiérrez, Elżbieta Szychowska‐Kra̧piec, Shestakova, Ta, Voltas, J, Saurer, M, Berninger, F, Esper, J, Andreu-Hayles, L, Daux, V, Helle, G, Leuenberger, M, Loader, Nj, Masson-Delmotte, V, Saracino, Antonio, Waterhouse, J, Schleser, Gh, Bednarz, Z, Boettger, T, Dorado-Liñán, I, Filot, M, Frank, D, Grabner, M, Haupt, M, Hilasvuori, E, Jungner, H, Kalela-Brundin, M, Krąpiec, M, Marah, H, Pawełczyk, S, Pazdur, A, Pierre, M, Planells, O, Pukienė, R, Reynolds-Henne, Ce, Rinne, Kt, Rita, Angelo, Sonninen, E, Stiévenard, M, Switsur, Vr, Szychowska-Krąpiec, E, Szczepanek, M, Todaro, L, Treydte, K, Vitas, A, Weigl, M, Wimmer, R, Gutiérrez, E, Hickler, T., Rinne‐Garmston , Katja T., The Woods Hole Research Center, Woods Hole Oceanographic Institution (WHOI), Department of Crop and Forest Sciences, School of Agrifood and Forestry Science and Engineering (ETSEA), University of Lleida-Agrotecnio Center (UdL-Agrotecnio), Laboratory of Atmospheric Chemistry [Paul Scherrer Institute] (LAC), Paul Scherrer Institute (PSI), Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Department of Forest Sciences [Helsinki], Faculty of Agriculture and Forestry [Helsinki], University of Helsinki-University of Helsinki, Department of Geography [Mainz], Johannes Gutenberg - Universität Mainz (JGU), Tree‐Ring Laboratory, Lamont–Doherty Earth Observatory of Columbia University, Palisades, New York, Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Géochrononologie Traceurs Archéométrie (GEOTRAC), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Glaces et Continents, Climats et Isotopes Stables (GLACCIOS), German Research Centre for Geosciences - Helmholtz-Centre Potsdam (GFZ), Climate and Environmental Physics [Bern] (CEP), Physikalisches Institut [Bern], Universität Bern [Bern]-Universität Bern [Bern], Department of Geography [Swansea], Swansea University, University of Naples Federico II, Anglia Ruskin University (ARU), Institut für Bio- und Geowissenschaften [Jülich], Forschungszentrum Jülich GmbH | Centre de recherche de Juliers, Helmholtz-Gemeinschaft = Helmholtz Association-Helmholtz-Gemeinschaft = Helmholtz Association, Department of Forest Biodiversity, University of Agriculture in Krakow, Department of Isotope Hydrology, Helmholtz Centre for Environmental Research ‒ UFZ, Halle, Germany, Centro de Investigacion Forestal (INIA-CIFOR), Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria = National Institute for Agricultural and Food Research and Technology (INIA), School of Geography and Development and Laboratory of Tree-Ring Research, University of Arizona, University of Natural Resources and Life Sciences (BOKU), Laboratory of Chronology, University of Helsinki, Helsinki, Finland, Forestry Museum, Lycksele, Sweden, AGH University of Science and Technology [Krakow, PL] (AGH UST), Laboratoire d'hydrologie isotopique, CNESTEN, Maroc., Chercheur indépendant, Silesian University of Technology, Department of Biological Evolution, Ecology and Environmental Sciences, University of Barcelona, Barcelona, Spain, The State Scientific Research Institute Nature Research Centre, Vilnius, Lithuania, Oeschger Centre for Climate Change Research (OCCR), University of Bern, Soil Ecosystems, Natural Resources Institute Finland (Luke), University of Basilicata, Department of Radioisotopes, Silesian University of Technology, Gliwice, Poland, Environmental Research Centre, Vytautas Magnus University, Kaunas, Lithuania, Holzforschung Austria, University of Natural Resources and Applied Life Sciences, IFA-Tulln, University of Barcelona, Helsingin yliopisto = Helsingfors universitet = University of Helsinki-Helsingin yliopisto = Helsingfors universitet = University of Helsinki, Johannes Gutenberg - Universität Mainz = Johannes Gutenberg University (JGU), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Universität Bern [Bern] (UNIBE)-Universität Bern [Bern] (UNIBE), University of Naples Federico II = Università degli studi di Napoli Federico II, Laboratory of Tree-Ring Research [University of Arizona] (LTRR), Universität für Bodenkultur Wien = University of Natural Resources and Life [Vienne, Autriche] (BOKU), Natural Resources Institute Finland (LUKE), and Università degli studi della Basilicata [Potenza] (UNIBAS)

Subjects
0106 biological sciences, Drought stress, 010504 meteorology & atmospheric sciences, [SDE.MCG]Environmental Sciences/Global Changes, Climate change, Fractionation, 010603 evolutionary biology, 01 natural sciences, Panoply, Dendroecology, [SDV.EE.ECO]Life Sciences [q-bio]/Ecology, environment/Ecosystems, Isotope fractionation, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, Evapotranspiration, ddc:550, Ecosystem, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, ComputingMilieux_MISCELLANEOUS, Ecology, Evolution, Behavior and Systematics, 0105 earth and related environmental sciences, Global and Planetary Change, Ecology, [CHIM.ORGA]Chemical Sciences/Organic chemistry, Tree rings, Carbon isotopes, 15. Life on land, [SDE.ES]Environmental Sciences/Environmental and Society, Tree (data structure), [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology, 13. Climate action, Isotopes of carbon, [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy, [SHS.ENVIR]Humanities and Social Sciences/Environmental studies, Environmental science, carbon isotopes, climate change, dendroecology, drought stress, European forests, latitudinal gradients, Pinus, Quercus, stomatal control, tree rings, European forests
Abstract

Aim The aim was to decipher Europe‐wide spatio‐temporal patterns of forest growth dynamics and their associations with carbon isotope fractionation processes inferred from tree rings as modulated by climate warming. Location Europe and North Africa (30‒70° N, 10° W‒35° E). Time period 1901‒2003. Major taxa studied Temperate and Euro‐Siberian trees. Methods We characterize changes in the relationship between tree growth and carbon isotope fractionation over the 20th century using a European network consisting of 20 site chronologies. Using indexed tree‐ring widths (TRWi), we assess shifts in the temporal coherence of radial growth across sites (synchrony) for five forest ecosystems (Atlantic, boreal, cold continental, Mediterranean and temperate). We also examine whether TRWi shows variable coupling with leaf‐level gas exchange, inferred from indexed carbon isotope discrimination of tree‐ring cellulose (Δ13Ci). Results We find spatial autocorrelation for TRWi and Δ13Ci extending over a maximum of 1,000 km among forest stands. However, growth synchrony is not uniform across Europe, but increases along a latitudinal gradient concurrent with decreasing temperature and evapotranspiration. Latitudinal relationships between TRWi and Δ13Ci (changing from negative to positive southwards) point to drought impairing carbon uptake via stomatal regulation for water saving occurring at forests below 60° N in continental Europe. An increase in forest growth synchrony over the 20th century together with increasingly positive relationships between TRWi and Δ13Ci indicate intensifying impacts of drought on tree performance. These effects are noticeable in drought‐prone biomes (Mediterranean, temperate and cold continental). Main conclusions At the turn of this century, convergence in growth synchrony across European forest ecosystems is coupled with coordinated warming‐induced effects of drought on leaf physiology and tree growth spreading northwards. Such a tendency towards exacerbated moisture‐sensitive growth and physiology could override positive effects of enhanced leaf intercellular CO2 concentrations, possibly resulting in Europe‐wide declines of forest carbon gain in the coming decades. Spanish Government, Grant/Award Number: AGL2015‐68274 ‐C3 ‐3‐R; Sixth Framework Programme, Grant/AwardNumber: EVK2‐2001 ‐00237; Seventh Framework Programme, Grant/AwardNumber: COST ‐STSM ‐ECOST ‐STSM ‐FP1304‐140915‐066395 and ERANET‐Mundus program (Grant agreement 20112573)

Published
2019

16. Water-use efficiency and transpiration across European forests during the Anthropocene

Author

M. Kalela-Brundin, Nicolas Viovy, Benjamin Poulter, Emilia Gutiérrez, Katja T. Rinne, H. Marah, Markus Leuenberger, Kerstin Treydte, Z. Bednarz, Mark R. Lomas, Emmi Hilasvuori, Niklaus E. Zimmermann, Philippe Ciais, John S. Waterhouse, Gerhard H. Schleser, David Frank, Stephen Sitch, Elżbieta Szychowska‐Kra̧piec, Laia Andreu-Hayles, Samuel Levis, Anna Pazdur, Michael Grabner, Tatjana Boettger, Gerhard Helle, Carmela Miriam D’Alessandro, Monique Pierre, Högne Jungner, V. R. Switsur, M. Filot, Matthias Saurer, Eloni Sonninen, Pierre Friedlingstein, Marek Krapiec, M. Szczepanek, C. E. Reynolds-Henne, Octavi Planells, Valérie Daux, Frank Berninger, Chris Huntingford, Luigi Todaro, Anders Ahlström, Valérie Masson-Delmotte, Jan Esper, Sławomira Pawełczyk, Marika Haupt, Neil J. Loader, Martin Weigl, Michel Stievenard, Antonio Saracino, R. Pukiene, Montana State University (MSU), Paul Scherrer Institute (PSI), Swiss Federal Research Institute WSL, SWISS FEDERAL RESEARCH INSTITUTE WSL, Centre for Ecology and Hydrology (CEH), Natural Environment Research Council (NERC), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), ICOS-ATC (ICOS-ATC), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), National Center for Atmospheric Research [Boulder] (NCAR), Centre for Terrestrial Carbon Dynamics: National Centre for Earth Observation (CTCD), University of Sheffield [Sheffield], College of Life and Environmental Sciences [Exeter], University of Exeter, Modélisation des Surfaces et Interfaces Continentales (MOSAIC), University of Helsinki, Géochrononologie Traceurs Archéométrie (GEOTRAC), Glaces et Continents, Climats et Isotopes Stables (GLACCIOS), Polish Geological Institute, Climate and Environmental Physics [Bern] (CEP), Physikalisches Institut [Bern], Universität Bern [Bern]-Universität Bern [Bern], CNESTEN, cnesten, inconnu, Inconnu, Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Helsingin yliopisto = Helsingfors universitet = University of Helsinki, Universität Bern [Bern] (UNIBE)-Universität Bern [Bern] (UNIBE), Frank, D. C., Poulter, B., Saurer, M., Esper, J., C., Huntingford, Helle, G., Treydte, K. S., Zimmermann, N. E., G. H., Schleser, A., Ahlström, P., Ciai, P., Friedlingstein, S., Levi, M., Loma, S., Sitch, N., Viovy, Andreu Hayles, L., Bednarz, Z., Berninger, F., Boettger, T., D’Alessandro, C. M., Daux, V., Filot, M., Grabner, M., Gutierrez, E., Haupt, M., Hilasvuori, E., Jungner, H., Kalela Brundin, M., Krapiec, M., Leuenberger, M., Loader, N. J., Marah, H., Masson Delmotte, V., Pazdur, A., Pawelczyk, S., Pierre, M., Planells, O., Pukiene, R., Reynolds Henne, C. E., Rinne, K. T., Saracino, Antonio, Sonninen, E., Stievenard, M., Switsur, V. R., Szczepanek, M., Szychowska Krapiec, E., Todaro, L., Waterhouse, J. S., and Weigl, M.

Subjects
hiilidioksidi, Stomatal conductance, hiili, [SDE.MCG]Environmental Sciences/Global Changes, ta1171, vesi, Growing season, Climate change, Environmental Science (miscellaneous), Atmospheric sciences, tree-ring, chemistry.chemical_compound, hydrologinen kierto, dioxide, [SDV.EE.ECO]Life Sciences [q-bio]/Ecology, environment/Ecosystems, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, kasvit, ilmasto, Water cycle, Water-use efficiency, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, climate, CO2 fertilization, ComputingMilieux_MISCELLANEOUS, Transpiration, Hydrology, ilmakehä, atmospheric CO2, elevated CO2, [CHIM.ORGA]Chemical Sciences/Organic chemistry, Global warming, varastointi, 15. Life on land, [SDE.ES]Environmental Sciences/Environmental and Society, gas-exchange, rising CO2, chemistry, 13. Climate action, stomatal conductance, [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology, [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy, [SHS.ENVIR]Humanities and Social Sciences/Environmental studies, Carbon dioxide, Environmental science, aineiden kierto, Social Sciences (miscellaneous), carbon-isotope discrimination
Abstract

Considering the combined effects of CO2 fertilization and climate change drivers on plant physiology leads to a modest increase in simulated European forest transpiration in spite of the effects of CO2-induced stomatal closure. The Earth’s carbon and hydrologic cycles are intimately coupled by gas exchange through plant stomata1,2,3. However, uncertainties in the magnitude4,5,6 and consequences7,8 of the physiological responses9,10 of plants to elevated CO2 in natural environments hinders modelling of terrestrial water cycling and carbon storage11. Here we use annually resolved long-term δ13C tree-ring measurements across a European forest network to reconstruct the physiologically driven response of intercellular CO2 (Ci) caused by atmospheric CO2 (Ca) trends. When removing meteorological signals from the δ13C measurements, we find that trees across Europe regulated gas exchange so that for one ppmv atmospheric CO2 increase, Ci increased by ∼0.76 ppmv, most consistent with moderate control towards a constant Ci/Ca ratio. This response corresponds to twentieth-century intrinsic water-use efficiency (iWUE) increases of 14 ± 10 and 22 ± 6% at broadleaf and coniferous sites, respectively. An ensemble of process-based global vegetation models shows similar CO2 effects on iWUE trends. Yet, when operating these models with climate drivers reintroduced, despite decreased stomatal opening, 5% increases in European forest transpiration are calculated over the twentieth century. This counterintuitive result arises from lengthened growing seasons, enhanced evaporative demand in a warming climate, and increased leaf area, which together oppose effects of CO2-induced stomatal closure. Our study questions changes to the hydrological cycle, such as reductions in transpiration and air humidity, hypothesized to result from plant responses to anthropogenic emissions.

Published
2015

17. Signal strength and climate calibration of a European tree-ring isotope network

Author

Emilia Gutiérrez, Anna Pazdur, Neil J. Loader, Michel Stievenard, Elżbieta Szychowska‐Kra̧piec, K. T. Rinne, Valérie Masson-Delmotte, Martin Weigl, Gerhard H. Schleser, Antonio Saracino, Jan Esper, Matthias Saurer, M. Kalela-Brundin, Kerstin Treydte, Markus Leuenberger, Octavi Planells, Luigi Todaro, Carmela Miriam D’Alessandro, Emmi Hilasvuori, V. R. Switsur, Laia Andreu, Eloni Sonninen, Högne Jungner, C. E. Reynolds-Henne, R. Pukiene, Michael Grabner, Tatjana Boettger, M. Filot, David Frank, Sławomira Pawełczyk, Marika Haupt, N. Etien, Frank Berninger, M. Szczepanek, M. T. Guillemin, Z. Bednarz, Monique Pierre, John S. Waterhouse, Marek Krapiec, Gerhard Helle, Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Glaces et Continents, Climats et Isotopes Stables (GLACCIOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Géochrononologie Traceurs Archéométrie (GEOTRAC), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Treydte, K, Frank, D, Andreu, L, Bednarz, Z, Berninger, F, Boettger, T, Dalessandro, Cm, Esper, J, Etien, N, Filot, M, Grabner, M, Guillemin, Mt, Gutirrez, E, Haupt, M, Helle, G, Hilasvuori, E, Jungner, H, KALELA BRUNDIN, M, Krapiec, M, Leuenberger, M, Loader, Nj, MASSON DELMOTTE, V, Pazdur, A, Pawelczyk, S, Pierre, M, Planells, O, Pukiene, R, REYNOLDS HENNE, Ce, Rinne, Kt, Saracino, Antonio, Saurer, M, Sonninen, E, Stievenard, M, Switsur, Vr, Szczepanek, M, SZYCHOWSKA KRAPIEC, E, Todaro, L, Waterhouse, J, Weigl, M, Schleser, Gh, and 0 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum

Subjects
Mediterranean climate, 010506 paleontology, 010504 meteorology & atmospheric sciences, δ18O, d13C, 550 - Earth sciences, 01 natural sciences, Mediterranean sea, Trend surface analysis, Temperate climate, Dendrochronology, ddc:550, Precipitation, 20th century chronologies, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, 0105 earth and related environmental sciences, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, tree ring, 15. Life on land, d18O, European network, Geophysics, 13. Climate action, General Earth and Planetary Sciences, Environmental science, Spatial variability, Physical geography
Abstract

We present the first European network of tree ring delta(13)C and delta(18)O, containing 23 sites from Finland to Morocco. Common climate signals are found over broad climatic-ecological ranges. In temperate regions we find positive correlations with summer maximum temperatures and negative correlations with summer precipitation and Palmer Drought Severity Indices (PDSI) with no obvious speciesspecific differences. Regional delta(13)C and delta(18)O chronologies share high common variance in year-to-year variations. Long-term variations, however, exhibit differences that may reflect spatial variability in environmental forcings, age trends and/or plant physiological responses to increasing atmospheric CO(2) concentration. Rotated principal component analysis (RPCA) and climate field correlations enable the identification of four sub-regions in the delta(18)O network - northern and eastern Central Europe, Scandinavia and the western Mediterranean. Regional patterns in the delta(13)C network are less clear and are timescale dependent. Our results indicate that future reconstruction efforts should concentrate on delta(18)O data in the identified European regions.

Published
2007

18. Reliability of temperature signal in various climate indicators from northern Europe.

Author

Hari P, Aakala T, Hilasvuori E, Häkkinen R, Korhola A, Korpela M, Linkosalo T, Mäkinen H, Nikinmaa E, Nöjd P, Seppä H, Sulkava M, Terhivuo J, Tuomenvirta H, Weckström J, and Hollmén J

Subjects
Europe, Reproducibility of Results, Seasons, Trees classification, Climate, Temperature
Abstract

We collected relevant observational and measured annual-resolution time series dealing with climate in northern Europe, focusing in Finland. We analysed these series for the reliability of their temperature signal at annual and seasonal resolutions. Importantly, we analysed all of the indicators within the same statistical framework, which allows for their meaningful comparison. In this framework, we employed a cross-validation procedure designed to reduce the adverse effects of estimation bias that may inflate the reliability of various temperature indicators, especially when several indicators are used in a multiple regression model. In our data sets, timing of phenological observations and ice break-up were connected with spring, tree ring characteristics (width, density, carbon isotopic composition) with summer and ice formation with autumn temperatures. Baltic Sea ice extent and the duration of ice cover in different watercourses were good indicators of winter temperatures. Using combinations of various temperature indicator series resulted in reliable temperature signals for each of the four seasons, as well as a reliable annual temperature signal. The results hence demonstrated that we can obtain reliable temperature information over different seasons, using a careful selection of indicators, combining the results with regression analysis, and by determining the reliability of the obtained indicator.

Published
2017
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19. Spatial variability and temporal trends in water-use efficiency of European forests.

Author

Saurer M, Spahni R, Frank DC, Joos F, Leuenberger M, Loader NJ, McCarroll D, Gagen M, Poulter B, Siegwolf RT, Andreu-Hayles L, Boettger T, Dorado Liñán I, Fairchild IJ, Friedrich M, Gutierrez E, Haupt M, Hilasvuori E, Heinrich I, Helle G, Grudd H, Jalkanen R, Levanič T, Linderholm HW, Robertson I, Sonninen E, Treydte K, Waterhouse JS, Woodley EJ, Wynn PM, and Young GH

Subjects
Carbon Isotopes analysis, Europe, Geography, Time Factors, Carbon Cycle physiology, Carbon Dioxide metabolism, Climate Change, Forests, Models, Theoretical, Trees growth & development, Water Cycle physiology
Abstract

The increasing carbon dioxide (CO2 ) concentration in the atmosphere in combination with climatic changes throughout the last century are likely to have had a profound effect on the physiology of trees: altering the carbon and water fluxes passing through the stomatal pores. However, the magnitude and spatial patterns of such changes in natural forests remain highly uncertain. Here, stable carbon isotope ratios from a network of 35 tree-ring sites located across Europe are investigated to determine the intrinsic water-use efficiency (iWUE), the ratio of photosynthesis to stomatal conductance from 1901 to 2000. The results were compared with simulations of a dynamic vegetation model (LPX-Bern 1.0) that integrates numerous ecosystem and land-atmosphere exchange processes in a theoretical framework. The spatial pattern of tree-ring derived iWUE of the investigated coniferous and deciduous species and the model results agreed significantly with a clear south-to-north gradient, as well as a general increase in iWUE over the 20th century. The magnitude of the iWUE increase was not spatially uniform, with the strongest increase observed and modelled for temperate forests in Central Europe, a region where summer soil-water availability decreased over the last century. We were able to demonstrate that the combined effects of increasing CO2 and climate change leading to soil drying have resulted in an accelerated increase in iWUE. These findings will help to reduce uncertainties in the land surface schemes of global climate models, where vegetation-climate feedbacks are currently still poorly constrained by observational data., (© 2014 John Wiley & Sons Ltd.)

Published
2014
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