Last millennium Northern Hemisphere summer temperatures from tree rings : part II, spatially resolved reconstructions
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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.
Anchukaitis , K J , Wilson , R , Briffa , K R , Büntgen , U , Cook , E R , D'Arrigo , R , Davi , N , Esper , J , Frank , D , Gunnarson , B E , Hegerl , G , Helama , S , Klesse , S , Krusic , P J , Linderholm , H W , Myglan , V , Osborn , T J , Zhang , P , Rydval , M , Schneider , L , Schurer , A , Wiles , G & Zorita , E 2017 , ' Last millennium Northern Hemisphere summer temperatures from tree rings : part II, spatially resolved reconstructions ' Quaternary Science Reviews , vol 163 , pp. 1-22 . DOI: 10.1016/j.quascirev.2017.02.020
Quaternary Science Reviews
© 2017 Elsevier Ltd. All rights reserved. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at: https://doi.org/10.1016/j.quascirev.2017.02.020
RW: UK Natural Environment Research Council (NERC - NE/K003097/1) and Leverhulme Trust project (F/00 268/BG)
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