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dc.contributor.authorPausata, Francesco S. R.eng
dc.contributor.authorLi, Camilleeng
dc.contributor.authorWettstein, Justineng
dc.contributor.authorNisancioglu, Kerim Hestneseng
dc.contributor.authorBattisti, David Stepheneng
dc.description.abstractUsing four different climate models, we investigate sea level pressure variability in the extratropical North Atlantic in the preindustrial climate (1750 AD) and at the Last Glacial Maximum (LGM, 21 kyrs before present) in order to understand how changes in atmospheric circulation can affect signals recorded in climate proxies. In general, the models exhibit a significant reduction in interannual variance of sea level pressure at the LGM compared to pre-industrial simulations and this reduction is concentrated in winter. For the preindustrial climate, all models feature a similar leading mode of sea level pressure variability that resembles the leading mode of variability in the instrumental record: the North Atlantic Oscillation (NAO). In contrast, the leading mode of sea level pressure variability at the LGM is model dependent, but in each model different from that in the preindustrial climate. In each model, the leading (NAO-like) mode of variability explains a smaller fraction of the variance and also less absolute variance at the LGM than in the preindustrial climate. The models show that the relationship between atmospheric variability and surface climate (temperature and precipitation) variability change in different climates. Results are model-specific, but indicate that proxy signals at the LGM may be misinterpreted if changes in the spatial pattern and seasonality of surface climate variability are not taken into account.en_US
dc.publisherCopernicus Publicationsen_US
dc.publisherEuropean Geosciences Unionen_US
dc.relation.ispartof<a href="" target="blank">Past climate variability: model analysis and proxy intercomparison</a>en_US
dc.rightsAttribution CC BYeng
dc.titleChanges in atmospheric variability in a glacial climate and the impacts on proxy data: a model intercomparisonen_US
dc.typePeer reviewed
dc.typeJournal article
dc.rights.holderCopyright Author(s) 2009en_US
dc.source.journalClimate of the Past

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