Causes and consequences of past and projected Scandinavian summer temperatures, 500-2100 AD

Ulf Büntgen, Christoph C. Raible, David Frank, Samuli Helama, Laura Cunningham, Dominik Hofer, Daniel Nievergelt, Anne Verstege, Mauri Timonen, Nils Chr Stenseth, Jan Esper

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

Tree rings dominate millennium-long temperature reconstructions and many records originate from Scandinavia, an area for which the relative roles of external forcing and internal variation on climatic changes are, however, not yet fully understood. Here we compile 1,179 series of maximum latewood density measurements from 25 conifer sites in northern Scandinavia, establish a suite of 36 subset chronologies, and analyse their climate signal. A new reconstruction for the 1483-2006 period correlates at 0.80 with June-August temperatures back to 1860. Summer cooling during the early 17th century and peak warming in the 1930s translate into a decadal amplitude of 2.9°C, which agrees with existing Scandinavian tree-ring proxies. Climate model simulations reveal similar amounts of mid to low frequency variability, suggesting that internal ocean-atmosphere feedbacks likely influenced Scandinavian temperatures more than external forcing. Projected 21st century warming under the SRES A2 scenario would, however, exceed the reconstructed temperature envelope of the past 1,500 years.

Original languageEnglish (US)
Article numbere25133
JournalPloS one
Volume6
Issue number9
DOIs
StatePublished - Sep 22 2011
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)
  • General

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