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Last millennium Northern Hemisphere summer temperatures from tree rings: part II, spatially resolved reconstructions

Research output: Contribution to journalArticle

Author(s)

Kevin J. Anchukaitis, Rob Wilson, Keith R. Briffa, Ulf Büntgen, Edward R. Cook, Rosanne D'Arrigo, Nicole Davi, Jan Esper, David Frank, Björn E. Gunnarson, Gabi Hegerl, Samuli Helama, Stefan Klesse, Paul J. Krusic, Hans W. Linderholm, Vladimir Myglan, Timothy J. Osborn, Peng Zhang, Miloš Rydval, Lea Schneider & 3 others Andrew Schurer, Greg Wiles, Eduardo Zorita

School/Research organisations

Abstract

Climate field reconstructions from networks of tree-ring proxy data can be used to characterize regional-scale climate changes, reveal spatial anomaly patterns associated with atmospheric circulation changes, radiative forcing, and large-scale modes of ocean-atmosphere variability, and provide spatiotemporal targets for climate model comparison and evaluation. Here we use a multiproxy network of tree-ring chronologies to reconstruct spatially resolved warm season (May–August) mean temperatures across the extratropical Northern Hemisphere (40-90°N) using Point-by-Point Regression (PPR). The resulting annual maps of temperature anomalies (750–1988 CE) reveal a consistent imprint of volcanism, with 96% of reconstructed grid points experiencing colder conditions following eruptions. Solar influences are detected at the bicentennial (de Vries) frequency, although at other time scales the influence of insolation variability is weak. Approximately 90% of reconstructed grid points show warmer temperatures during the Medieval Climate Anomaly when compared to the Little Ice Age, although the magnitude varies spatially across the hemisphere. Estimates of field reconstruction skill through time and over space can guide future temporal extension and spatial expansion of the proxy network.
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Details

Original languageEnglish
Pages (from-to)1-22
Number of pages22
JournalQuaternary Science Reviews
Volume163
Early online date8 Mar 2017
DOIs
Publication statusPublished - 1 May 2017

    Research areas

  • Tree-rings, Northern Hemisphere, Last millennium, Common Era, Summer temperatures, Reconstruction, Spatial

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