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Revising midlatitude summer temperatures back to A.D. 600 based on a wood density network
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2015 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 42, no 11, p. 4556-4562Article in journal (Refereed) Published
Abstract [en]

Annually resolved and millennium-long reconstructions of large-scale temperature variability are primarily composed of tree ring width (TRW) chronologies. Changes in ring width, however, have recently been shown to bias the ratio between low- and high-frequency signals. To overcome limitations in capturing the full spectrum of past temperature variability, we present a network of 15 maximum latewood density (MXD) chronologies distributed across the Northern Hemisphere extratropics. Independent subsets of continental-scale records consistently reveal high MXD before 1580 and after 1910, with below average values between these periods. Reconstructed extratropical summer temperatures reflect not only these long-term trends but also distinct cooling pulses after large volcanic eruptions. In contrast to TRW-dominated reconstructions, this MXD-based record indicates a delayed onset of the Little Ice Age by almost two centuries. The reduced memory inherent in MXD is likely responsible for the rapid recovery from volcanic-induced cooling in the fourteenth century and the continuation of warmer temperatures until 1600.

Place, publisher, year, edition, pages
2015. Vol. 42, no 11, p. 4556-4562
Keywords [en]
Paleoclimatology, Climate change and variability, Dendrochronology, Continental climate records, Volcano/climate interactions, maximum latewood density, tree rings, millennial reconstruction, volcanic cooling, Little Ice Age, beta value
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Natural Sciences
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URN: urn:nbn:se:polar:diva-4024DOI: 10.1002/2015GL063956OAI: oai:DiVA.org:polar-4024DiVA, id: diva2:1169161
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2015GL063956

Available from: 2017-12-22 Created: 2017-12-22 Last updated: 2017-12-22

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