caa a22 4500 605474540 CHVBK 20210128100348.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s00382-014-2191-8 doi (NATIONALLICENCE)springer-10.1007/s00382-014-2191-8 A tree-ring field reconstruction of Fennoscandian summer hydroclimate variability for the last millennium [Elektronische Daten] [Kristina Seftigen, Jesper Björklund, Edward Cook, Hans Linderholm] Hydroclimatological extremes, such as droughts and floods, are expected to increase in frequency and intensity with global climate change. An improved knowledge of its natural variability and the underlying physical mechanisms for changes in the hydrological cycle will help understand the response of extreme hydroclimatic events to climate warming. This study presents the first gridded hydroclimatic reconstruction (0.5°×0.5° grid resolution), as expressed by the warm season Standardized Precipitation Evapotranspiration Index (SPEI), for most of Fennoscandia. A point-by-point regression approach is used to develop the reconstruction from a network of moisture sensitive tree-ring chronologies spanning over the past millennium. The reconstruction gives a unique opportunity to examine the frequency, severity, persistence, and spatial characteristics of Fennoscandian hydroclimatic variability in the context of the last 1,000years. The full SPEI reconstruction highlights the seventeenth century as a period of frequent severe and widespread hydroclimatic anomalies. Although some severe extremes have occurred locally throughout the domain over the fifteenth and sixteenth centuries, the period is surprisingly free from any spatially extensive anomalies. The twentieth century is not anomalous in terms of the number of severe and spatially extensive hydro climatic extremes in the context of the last millennium. Principle component analysis reveals that there are two dominant modes of spatial moisture variability across Fennoscandia. The same patterns are evident in the observational record and in the reconstructed dataset over the instrumental era and two paleoperiods. The 500mb pressure patterns associated with the two modes suggests the importance of the summer North Atlantic Oscillation. Springer-Verlag Berlin Heidelberg, 2014 Hydroclimate nationallicence Tree-ring nationallicence Standardized precipitation evapotranspiration index nationallicence Field reconstruction nationallicence Fennoscandia nationallicence North Atlantic Oscillation nationallicence Seftigen Kristina Regional Climate Group, Department of Earth Sciences, University of Gothenburg, Box 460, 405 30, Gothenburg, Sweden aut Björklund Jesper Regional Climate Group, Department of Earth Sciences, University of Gothenburg, Box 460, 405 30, Gothenburg, Sweden aut Cook Edward Lamont-Doherty Earth Observatory, 10964, Palisades, NY, USA aut Linderholm Hans Regional Climate Group, Department of Earth Sciences, University of Gothenburg, Box 460, 405 30, Gothenburg, Sweden aut Climate Dynamics Springer Berlin Heidelberg 44/11-12(2015-06-01), 3141-3154 0930-7575 44:11-12<3141 2015 44 382 https://doi.org/10.1007/s00382-014-2191-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00382-014-2191-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Seftigen Kristina Regional Climate Group, Department of Earth Sciences, University of Gothenburg, Box 460, 405 30, Gothenburg, Sweden aut NATIONALLICENCE 700 1- Björklund Jesper Regional Climate Group, Department of Earth Sciences, University of Gothenburg, Box 460, 405 30, Gothenburg, Sweden aut NATIONALLICENCE 700 1- Cook Edward Lamont-Doherty Earth Observatory, 10964, Palisades, NY, USA aut NATIONALLICENCE 700 1- Linderholm Hans Regional Climate Group, Department of Earth Sciences, University of Gothenburg, Box 460, 405 30, Gothenburg, Sweden aut NATIONALLICENCE 773 0- Climate Dynamics Springer Berlin Heidelberg 44/11-12(2015-06-01), 3141-3154 0930-7575 44:11-12<3141 2015 44 382