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| Titel |
Last nine-thousand years of temperature variability in Northern Europe |
| VerfasserIn |
H. Seppä, A. E. Bjune, R. J. Telford, H. J. B. Birks, S. Veski |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 5, no. 3 ; Nr. 5, no. 3 (2009-09-18), S.523-535 |
| Datensatznummer |
250002550
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| Publikation (Nr.) |
 copernicus.org/cp-5-523-2009.pdf |
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| Zusammenfassung |
| The threat of future global warming has generated a major interest in
quantifying past climate variability on centennial and millennial
time-scales. However, palaeoclimatological records are often noisy and
arguments about past variability are only possible if they are based on
reproducible features in several reliably dated datasets. Here we focus on
the last 9000 years, explore the results of 36 Holocene pollen-based July
mean and annual mean temperature reconstructions from Northern Europe by
stacking them to create summary curves, and compare them with a
high-resolution, summary chironomid-based temperature record and other
independent palaeoclimate records. The stacked records show that the
"Holocene Thermal Maximum" in the region dates to 8000 to 4800 cal yr BP
and that the "8.2 event" and the "Little Ice Age" at
500–100 cal yr BP are the clearest cold episodes during the Holocene. In
addition, a more detailed analysis of the last 5000 years pinpoints
centennial-scale climate variability with cold anomalies at 3800–3000 and
500–100 cal yr BP, a long, warmer period around 2000 cal yr BP, and a
marked warming since the mid 19th century. The colder (warmer) anomalies are
associated with increased (decreased) humidity over the northern European
mainland, consistent with the modern high correlation between cold (warm) and
humid (dry) modes of summer weather in the region. A comparison with the key
proxy records reflecting the main forcing factors does not support the
hypothesis that solar variability is the cause of the late-Holocene
centennial-scale temperature changes. We suggest that the reconstructed
anomalies are typical of Northern Europe and their occurrence may be related
to the oceanic and atmospheric circulation variability in the North Atlantic
– North-European region. |
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