Changing correlation structures of the Northern Hemisphere atmospheric circulation from 1000 to 2100 AD

Atmospheric circulation modes are important concepts in understanding the variability of atmospheric dynamics. Assuming their spatial patterns to be fixed, such modes are often described by simple indices from rather short observational data sets. The increasing length of reanalysis products allows...

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Detalles Bibliográficos
Autores: Raible, C. C., Lehner, F., González Rouco, Jesús Fidel, Fernández Donado, Laura
Tipo de recurso: artículo
Fecha de publicación:2014
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/35090
Acceso en línea:https://hdl.handle.net/20.500.14352/35090
Access Level:acceso abierto
Palabra clave:52
Atlantic oscillation
Climate variability
20th-century reanalysis
Last millennium
Reconstructions
Simulations
Temperature
Winter
Model
Nao
Astrofísica
Astronomía (Física)
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spelling Changing correlation structures of the Northern Hemisphere atmospheric circulation from 1000 to 2100 ADRaible, C. C.Lehner, F.González Rouco, Jesús FidelFernández Donado, Laura52Atlantic oscillationClimate variability20th-century reanalysisLast millenniumReconstructionsSimulationsTemperatureWinterModelNaoAstrofísicaAstronomía (Física)Atmospheric circulation modes are important concepts in understanding the variability of atmospheric dynamics. Assuming their spatial patterns to be fixed, such modes are often described by simple indices from rather short observational data sets. The increasing length of reanalysis products allows these concepts and assumptions to be scrutinised. Here we investigate the stability of spatial patterns of Northern Hemisphere teleconnections by using the Twentieth Century Reanalysis as well as several control and transient millennium-scale simulations with coupled models. The observed and simulated centre of action of the two major teleconnection patterns, the North Atlantic Oscillation (NAO) and to some extent the Pacific North American (PNA), are not stable in time. The currently observed dipole pattern of the NAO, its centre of action over Iceland and the Azores, split into a north-south dipole pattern in the western Atlantic with a wave train pattern in the eastern part, connecting the British Isles with West Greenland and the eastern Mediterranean during the period 1940-1969 AD. The PNA centres of action over Canada are shifted southwards and over Florida into the Gulf of Mexico during the period 1915-1944 AD. The analysis further shows that shifts in the centres of action of either teleconnection pattern are not related to changes in the external forcing applied in transient simulations of the last millennium. Such shifts in their centres of action are accompanied by changes in the relation of local precipitation and temperature with the overlying atmospheric mode. These findings further undermine the assumption of stationarity between local climate/proxy variability and large-scale dynamics inherent when using proxy-based reconstructions of atmospheric modes, and call for a more robust understanding of atmospheric variability on decadal timescales.Copernicus Gesellschaft MBHUniversidad Complutense de Madrid20142014-01-0120142014-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/35090reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Atribución 3.0 Españahttps://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/350902026-06-02T12:44:21Z
dc.title.none.fl_str_mv Changing correlation structures of the Northern Hemisphere atmospheric circulation from 1000 to 2100 AD
title Changing correlation structures of the Northern Hemisphere atmospheric circulation from 1000 to 2100 AD
spellingShingle Changing correlation structures of the Northern Hemisphere atmospheric circulation from 1000 to 2100 AD
Raible, C. C.
52
Atlantic oscillation
Climate variability
20th-century reanalysis
Last millennium
Reconstructions
Simulations
Temperature
Winter
Model
Nao
Astrofísica
Astronomía (Física)
title_short Changing correlation structures of the Northern Hemisphere atmospheric circulation from 1000 to 2100 AD
title_full Changing correlation structures of the Northern Hemisphere atmospheric circulation from 1000 to 2100 AD
title_fullStr Changing correlation structures of the Northern Hemisphere atmospheric circulation from 1000 to 2100 AD
title_full_unstemmed Changing correlation structures of the Northern Hemisphere atmospheric circulation from 1000 to 2100 AD
title_sort Changing correlation structures of the Northern Hemisphere atmospheric circulation from 1000 to 2100 AD
dc.creator.none.fl_str_mv Raible, C. C.
Lehner, F.
González Rouco, Jesús Fidel
Fernández Donado, Laura
author Raible, C. C.
author_facet Raible, C. C.
Lehner, F.
González Rouco, Jesús Fidel
Fernández Donado, Laura
author_role author
author2 Lehner, F.
González Rouco, Jesús Fidel
Fernández Donado, Laura
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 52
Atlantic oscillation
Climate variability
20th-century reanalysis
Last millennium
Reconstructions
Simulations
Temperature
Winter
Model
Nao
Astrofísica
Astronomía (Física)
topic 52
Atlantic oscillation
Climate variability
20th-century reanalysis
Last millennium
Reconstructions
Simulations
Temperature
Winter
Model
Nao
Astrofísica
Astronomía (Física)
description Atmospheric circulation modes are important concepts in understanding the variability of atmospheric dynamics. Assuming their spatial patterns to be fixed, such modes are often described by simple indices from rather short observational data sets. The increasing length of reanalysis products allows these concepts and assumptions to be scrutinised. Here we investigate the stability of spatial patterns of Northern Hemisphere teleconnections by using the Twentieth Century Reanalysis as well as several control and transient millennium-scale simulations with coupled models. The observed and simulated centre of action of the two major teleconnection patterns, the North Atlantic Oscillation (NAO) and to some extent the Pacific North American (PNA), are not stable in time. The currently observed dipole pattern of the NAO, its centre of action over Iceland and the Azores, split into a north-south dipole pattern in the western Atlantic with a wave train pattern in the eastern part, connecting the British Isles with West Greenland and the eastern Mediterranean during the period 1940-1969 AD. The PNA centres of action over Canada are shifted southwards and over Florida into the Gulf of Mexico during the period 1915-1944 AD. The analysis further shows that shifts in the centres of action of either teleconnection pattern are not related to changes in the external forcing applied in transient simulations of the last millennium. Such shifts in their centres of action are accompanied by changes in the relation of local precipitation and temperature with the overlying atmospheric mode. These findings further undermine the assumption of stationarity between local climate/proxy variability and large-scale dynamics inherent when using proxy-based reconstructions of atmospheric modes, and call for a more robust understanding of atmospheric variability on decadal timescales.
publishDate 2014
dc.date.none.fl_str_mv 2014
2014-01-01
2014
2014-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/35090
url https://hdl.handle.net/20.500.14352/35090
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución 3.0 España
https://creativecommons.org/licenses/by/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución 3.0 España
https://creativecommons.org/licenses/by/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Copernicus Gesellschaft MBH
publisher.none.fl_str_mv Copernicus Gesellschaft MBH
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301603

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