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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://hdl.handle.net/10.1126/science.1166349
In: Science (Washington). American Association for the Advancement of Science: New York, N.Y. ISSN 0036-8075, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • Trouet, V.
  • Esper, J.
  • Graham, N.E.
  • Baker, A.
  • Scourse, J.D.
  • Frank, D.C.

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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