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Article Dans Une Revue Geophysical Research Letters Année : 2005

Mid-Holocene NAO: A PMIP2 model intercomparison

Résumé

The mid‐Holocene (6000 years before present) North Atlantic 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.

Domaines

Climatologie
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Dates et versions

hal-02931809 , version 1 (17-09-2020)

Identifiants

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R. Gladstone, I. Ross, P.J. Valdes, A. Abe-Ouchi, P. Braconnot, et al.. Mid-Holocene NAO: A PMIP2 model intercomparison. Geophysical Research Letters, 2005, 32 (16), ⟨10.1029/2005GL023596⟩. ⟨hal-02931809⟩
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