Mid-Holocene NAO: A PMIP2 model intercomparison
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...
Published in: | Geophysical Research Letters |
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Main Authors: | , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2005
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Subjects: | |
Online Access: | https://hdl.handle.net/1983/f7387565-badc-4a7e-be0a-3f1d31b8eff4 https://research-information.bris.ac.uk/en/publications/f7387565-badc-4a7e-be0a-3f1d31b8eff4 https://doi.org/10.1029/2005GL023596 |
Summary: | 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. 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. |
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