Persistent positive North Atlantic Oscillation mode dominated the medieval climate anomaly
Trouet, V.; Esper, J.; Graham, N.E.; Baker, A.; Scourse, J.D.; Frank, D.C. (2009). Persistent positive North Atlantic Oscillation mode dominated the medieval climate anomaly. Science (Wash.) 324(5923): 78-80. https://dx.doi.org/10.1126/science.1166349
In: Science (Washington). American Association for the Advancement of Science: New York, N.Y. ISSN 0036-8075; e-ISSN 1095-9203, meer
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| Auteurs | | Top |
- Trouet, V.
- Esper, J.
- Graham, N.E.
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- Baker, A.
- Scourse, J.D.
- Frank, D.C.
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| Abstract |
The Medieval Climate Anomaly (MCA) was the most recent pre-industrial era warm interval of European climate, yet its driving mechanisms remain uncertain. We present here a 947-year-long multidecadal North Atlantic Oscillation (NAO) reconstruction and find a persistent positive NAO during the MCA. Supplementary reconstructions based on climate model results and proxy data indicate a clear shift to weaker NAO conditions into the Little Ice Age (LIA). Globally distributed proxy data suggest that this NAO shift is one aspect of a global MCA-LIA climate transition that probably was coupled to prevailing La Nina-like conditions amplified by an intensified Atlantic meridional overturning circulation during the MCA. |
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