Persistent positive north atlantic oscillation mode dominated the medieval climate anomaly

Valérie Trouet, Jan Esper, Nicholas E. Graham, Andy Baker, James D. Scourse, David C. Frank

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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 Niña-like conditions amplified by an intensified Atlantic meridional overturning circulation during the MCA.

Original languageEnglish (US)
Pages (from-to)78-80
Number of pages3
JournalScience
Volume324
Issue number5923
DOIs
StatePublished - Apr 3 2009
Externally publishedYes

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ASJC Scopus subject areas

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Cite this

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, 324(5923), 78-80. https://doi.org/10.1126/science.1166349