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| Titel |
Northern Hemisphere temperature patterns in the last 12 centuries |
| VerfasserIn |
F. C. Ljungqvist, P. J. Krusic, G. Brattström, H. S. Sundqvist |
| 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 ; 8, no. 1 ; Nr. 8, no. 1 (2012-02-03), S.227-249 |
| Datensatznummer |
250005371
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| Publikation (Nr.) |
 copernicus.org/cp-8-227-2012.pdf |
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| Zusammenfassung |
| We analyse the spatio-temporal patterns of temperature variability over
Northern Hemisphere land areas, on centennial time-scales, for the last 12
centuries using an unprecedentedly large network of temperature-sensitive
proxy records. Geographically widespread positive temperature anomalies are
observed from the 9th to 11th centuries, similar in extent and magnitude to
the 20th century mean. A dominance of widespread negative anomalies is
observed from the 16th to 18th centuries. Though we find the amplitude and
spatial extent of the 20th century warming is within the range of
natural variability over the last 12 centuries, we also find that the rate
of warming from the 19th to the 20th century is unprecedented in
the context of the last 1200 yr. The positive Northern Hemisphere
temperature change from the 19th to the 20th century is clearly the largest
between any two consecutive centuries in the past 12 centuries. These
results remain robust even after removing a significant number of proxies in
various tests of robustness showing that the choice of proxies has no
particular influence on the overall conclusions of this study. |
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