Changes in atmospheric variability in a glacial climate and the impacts on proxy data: a model intercomparison
Using 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...
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Online Access: | https://hdl.handle.net/1956/9430 https://doi.org/10.5194/cp-5-489-2009 |
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ftunivbergen:oai:bora.uib.no:1956/9430 2023-05-15T17:30:55+02:00 Changes in atmospheric variability in a glacial climate and the impacts on proxy data: a model intercomparison Pausata, Francesco S. R. Li, Camille Wettstein, Justin Nisancioglu, Kerim Hestnes Battisti, David Stephen 2009-09-11 application/pdf https://hdl.handle.net/1956/9430 https://doi.org/10.5194/cp-5-489-2009 eng eng Copernicus Publications European Geosciences Union Past climate variability: model analysis and proxy intercomparison urn:issn:1814-9324 https://hdl.handle.net/1956/9430 https://doi.org/10.5194/cp-5-489-2009 cristin:345947 Attribution CC BY http://creativecommons.org/licenses/by/3.0/ Copyright Author(s) 2009 Climate of the Past 5 489-502 Peer reviewed Journal article 2009 ftunivbergen https://doi.org/10.5194/cp-5-489-2009 2023-03-14T17:39:04Z Using 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. publishedVersion Article in Journal/Newspaper North Atlantic North Atlantic oscillation University of Bergen: Bergen Open Research Archive (BORA-UiB) Climate of the Past 5 3 489 502 |
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Open Polar |
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University of Bergen: Bergen Open Research Archive (BORA-UiB) |
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ftunivbergen |
language |
English |
description |
Using 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. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Pausata, Francesco S. R. Li, Camille Wettstein, Justin Nisancioglu, Kerim Hestnes Battisti, David Stephen |
spellingShingle |
Pausata, Francesco S. R. Li, Camille Wettstein, Justin Nisancioglu, Kerim Hestnes Battisti, David Stephen Changes in atmospheric variability in a glacial climate and the impacts on proxy data: a model intercomparison |
author_facet |
Pausata, Francesco S. R. Li, Camille Wettstein, Justin Nisancioglu, Kerim Hestnes Battisti, David Stephen |
author_sort |
Pausata, Francesco S. R. |
title |
Changes in atmospheric variability in a glacial climate and the impacts on proxy data: a model intercomparison |
title_short |
Changes in atmospheric variability in a glacial climate and the impacts on proxy data: a model intercomparison |
title_full |
Changes in atmospheric variability in a glacial climate and the impacts on proxy data: a model intercomparison |
title_fullStr |
Changes in atmospheric variability in a glacial climate and the impacts on proxy data: a model intercomparison |
title_full_unstemmed |
Changes in atmospheric variability in a glacial climate and the impacts on proxy data: a model intercomparison |
title_sort |
changes in atmospheric variability in a glacial climate and the impacts on proxy data: a model intercomparison |
publisher |
Copernicus Publications |
publishDate |
2009 |
url |
https://hdl.handle.net/1956/9430 https://doi.org/10.5194/cp-5-489-2009 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Climate of the Past 5 489-502 |
op_relation |
Past climate variability: model analysis and proxy intercomparison urn:issn:1814-9324 https://hdl.handle.net/1956/9430 https://doi.org/10.5194/cp-5-489-2009 cristin:345947 |
op_rights |
Attribution CC BY http://creativecommons.org/licenses/by/3.0/ Copyright Author(s) 2009 |
op_doi |
https://doi.org/10.5194/cp-5-489-2009 |
container_title |
Climate of the Past |
container_volume |
5 |
container_issue |
3 |
container_start_page |
489 |
op_container_end_page |
502 |
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1766128064418283520 |