Mid-Holocene NAO: A PMIP2 model intercomparison

RM Gladstone; I Ross; PJ Valdes; A Abe-Ouchi; P Braconnot; S Brewer; M Kageyama; M Kitoh; A Legrande; O Marti; R Ohgaito; B Otto-Bliesner; W Peltier; G Vettoretti

doi:10.1029/2005GL023596

Mid-Holocene NAO: A PMIP2 model intercomparison

RM Gladstone, I Ross, PJ Valdes, A Abe-Ouchi, P Braconnot, S Brewer, M Kageyama, M Kitoh, A Legrande, O Marti, R Ohgaito, B Otto-Bliesner, W Peltier, G Vettoretti

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Abstract

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.

Translated title of the contribution	Mid-Holocene NAO: A PMIP2 model intercomparison
Original language	English
Journal	Geophysical Research Letters
Volume	32
DOIs	https://doi.org/10.1029/2005GL023596
Publication status	Published - Aug 2005

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title = "Mid-Holocene NAO: A PMIP2 model intercomparison",

abstract = "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.",

author = "RM Gladstone and I Ross and PJ Valdes and A Abe-Ouchi and P Braconnot and S Brewer and M Kageyama and M Kitoh and A Legrande and O Marti and R Ohgaito and B Otto-Bliesner and W Peltier and G Vettoretti",

year = "2005",

month = aug,

doi = "10.1029/2005GL023596",

language = "English",

volume = "32",

journal = "Geophysical Research Letters",

issn = "1944-8007",

publisher = "American Geophysical Union",

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TY - JOUR

T1 - Mid-Holocene NAO: A PMIP2 model intercomparison

AU - Gladstone, RM

AU - Ross, I

AU - Valdes, PJ

AU - Abe-Ouchi, A

AU - Braconnot, P

AU - Brewer, S

AU - Kageyama, M

AU - Kitoh, M

AU - Legrande, A

AU - Marti, O

AU - Ohgaito, R

AU - Otto-Bliesner, B

AU - Peltier, W

AU - Vettoretti, G

PY - 2005/8

Y1 - 2005/8

N2 - 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.

AB - 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.

U2 - 10.1029/2005GL023596

DO - 10.1029/2005GL023596

M3 - Article (Academic Journal)

SN - 1944-8007

VL - 32

JO - Geophysical Research Letters

JF - Geophysical Research Letters

ER -

Mid-Holocene NAO: A PMIP2 model intercomparison

Abstract

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