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| Titel |
Tree-ring growth concordance across northwest Eurasia for the last 2000 years |
| VerfasserIn |
V. V. Shishov, T. M. Melvin, K. R. Briffa |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250020875
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| Zusammenfassung |
| This work describes variability in tree-ring growth concordance at several locations in the high latitudes of Eurasia, providing a wide regional comparison over a 2000-year period (Briffa et al., 2008). The study focuses on the nature of local and widespread tree-growth responses to recent warming seen in instrumental observations, available in northern regions for periods ranging from decades to a century.
Ring-width measurements from the AD portions of selected long chronologies comprising data from a mixture of living and sub-fossil trees were reprocessed and used to create 3 long-term tree-ring chronologies: 1) Fennoscandia regional chronology (Grudd et al., 2002; Eronen et al., 2002; Helama et al. 2002), 2)Yamal regional chronology (Hantemirov & Shiyatov, 2002) and 3) Avam–Taimyr regional chronology (Naurzbaev et al., 2002; Sidorova et al., 2007).
Moving Kendall's concordance coefficient was used to estimate a time-dependent spatial similarity in tree-ring growth (Briffa et al., 2008).
Analysis of concordance coefficient provides strong evidence that the extent of recent widespread warming across northwest Eurasia, with respect to 100- to 200-year trends, is unprecedented in the last 2000 years. An equivalent analysis of simulated temperatures using the HadCM3 model fails to show a similar increase in concordance expected as a consequence of anthropogenic forcing. |
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