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

Journal article
Authors Kevin Anchukaitis
Rob Wilson
Keith Briffa
Ulf Büntgen
Edward Cook
Rosanne D'Arrigo
Nicole Davi
Jan Esper
David Frank
Björn Gunnarson
Gabi Hegerl
Samuli Helama
Stefan Klesse
Paul Krisic
Hans W. Linderholm
Vladimir Myglan
Timothy Osborn
Peng Zhang
Milos Rydval
Lea Schneider
Andrew Schurer
Greg Wiles
Eduardo Zorita
Published in Quaternary Science Reviews
Volume 163
Pages 1-22
ISSN 0277-3791
Publication year 2017
Published at Department of Earth Sciences
Pages 1-22
Language en
Keywords Tree-rings, Northern Hemisphere, Last millennium, Common Era, Summer temperatures, Reconstruction, Spatial
Subject categories Climate Research


Climate field reconstructions from networks of tree-ring proxy data can be used to characterize regionalscale 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 (MayeAugust) mean temperatures across the extratropical Northern Hemisphere (40-90#1;N) using Point-by-Point Regression (PPR). The resulting annual maps of temperature anomalies (750e1988 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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