Persistent Positive North Atlantic Oscillation Mode Dominated the Medieval Climate Anomaly

V Trouet; J Esper; NE Graham; Andrew Baker; JD Scourse; DC Frank

doi:10.1126/science.1166349

Persistent Positive North Atlantic Oscillation Mode Dominated the Medieval Climate Anomaly

V Trouet, J Esper, NE Graham, Andrew Baker, JD Scourse, DC 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 Nina-like conditions amplified by an intensified Atlantic meridional overturning circulation during the MCA.

Original language	English
Pages (from-to)	78-80
Number of pages	3
Journal	Science
Volume	324
Issue number	5923
DOIs	https://doi.org/10.1126/science.1166349
Publication status	Published - 1 Apr 2009

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title = "Persistent Positive North Atlantic Oscillation Mode Dominated the Medieval Climate Anomaly",

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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AU - Trouet, V

AU - Esper, J

AU - Graham, NE

AU - Baker, Andrew

AU - Scourse, JD

AU - Frank, DC

PY - 2009/4/1

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N2 - 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.

AB - 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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DO - 10.1126/science.1166349

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SP - 78

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JO - Science

JF - Science

IS - 5923

ER -

Persistent Positive North Atlantic Oscillation Mode Dominated the Medieval Climate Anomaly

Abstract

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