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Northern European summer temperature variations over the Common Era from integrated tree-ring density records
- Esper, Jan (author)
- Duethorn, Elisabeth (author)
-
- Krusic, Paul J. (author)
- Stockholms universitet,Institutionen för naturgeografi och kvartärgeologi (INK)
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- Timonen, Mauri (author)
- Buentgen, Ulf (author)
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- (creator_code:org_t)
- 2014-07-15
- 2014
- English.
- In: Journal of Quaternary Science. - : Wiley. - 0267-8179 .- 1099-1417. ; 29:5, s. 487-494
- Journal article (peer-reviewed)
Abstract
Subject headings
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- Tree-ring chronologies of maximum latewood density are most suitable to reconstruct annually resolved summer temperature variations of the late Holocene. The two longest such chronologies have been developed in northern Europe stretching back to the 2nd century BC, and the 5th century AD. We show where similarities between the two chronologies exist, and combine portions of both into a new summer temperature reconstruction for the Common Era. To minimize the transfer of potential biases, we assess the contribution of the candidate reconstructions' measurements, and exclude data (i) from exceptionally young and old trees, and (ii) produced by different laboratory technologies. Our new composite reconstruction reveals warmer conditions during Roman, Medieval and recent times, separated by prolonged cooling during the Migration period and Little Ice Age. Twentieth century warmth, as indicated in one of the existing density records, is reduced in the new reconstruction, also affecting the overall, millennial-scale, cooling trend over the late Holocene (-0.30 degrees C per 1000 years). Due to the reduced biological memory, typical for tree-ring density measurements, the new reconstruction is most suitable for evaluating the rate and speed of abrupt summer cooling following large volcanic eruptions.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Keyword
- dendrochronology
- Finland
- late Holocene
- Sweden
- temperature reconstruction
Publication and Content Type
- ref (subject category)
- art (subject category)
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