Mid-Holocene NAO:A PMIP2 model intercomparison

The mid-Holocene (6000 years before present) North Atantic Oscillation (NAO) from nine models in the Paleoclimate Modeling Intercomparison Project Phase 2 is studied, primarily through principal component analysis of winter time North Atlantic sea level pressure (SLP). Modeled mid-Holocene NAO and m...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Gladstone, R. M., Ross, I., Valdes, P. J., Abe-Ouchi, A., Braconnot, P., Brewer, S., Kageyama, M., Kitoh, A., Legrande, A., Marti, O., Ohgaito, R., Otto-Bliesner, B., Peltier, W. R., Vettoretti, G.
Format: Article in Journal/Newspaper
Language:English
Published: 2005
Subjects:
North Atlantic
Online Access:https://research.ulapland.fi/fi/publications/3947b3dc-3fc2-47bd-8373-994b06845e60
https://doi.org/10.1029/2005GL023596
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Summary:The mid-Holocene (6000 years before present) North Atantic Oscillation (NAO) from nine models in the Paleoclimate Modeling Intercomparison Project Phase 2 is studied, primarily through principal component analysis of winter time North Atlantic sea level pressure (SLP). Modeled mid-Holocene NAO and mean SLP show small changes compared to pre-industrial control runs, with a shift in mean state towards a more positive NAO regime for three of the models. Modeled NAO variability shows little change, with a small increase for some models in the fraction of time spent in the NAO-negative phase during the mid-Holocene. Proxy based reconstructions of the NAO indicate a more positive NAO regime compared to present day during the mid- Holocene. We hypothesise that there was a small NAO+ like shift in mean state during the mid-Holocene.

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