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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Copernicus Gesellschaft MBH
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ftunivcmadrid:oai:www.ucm.es:36093 2023-05-15T16:30:05+02:00 Changing correlation structures of the Northern Hemisphere atmospheric circulation from 1000 to 2100 AD Raible, C. C. Lehner, F. González Rouco, J. Fidel Fernández Donado, Laura 2014 application/pdf https://eprints.ucm.es/id/eprint/36093/ https://eprints.ucm.es/id/eprint/36093/1/gonzalezrouco01libre%2BCC.pdf https://doi.org/10.5194/cp-10-537-2014 en eng Copernicus Gesellschaft MBH https://eprints.ucm.es/id/eprint/36093/1/gonzalezrouco01libre%2BCC.pdf cc_by info:eu-repo/semantics/openAccess CC-BY Astrofísica Astronomía info:eu-repo/semantics/article PeerReviewed 2014 ftunivcmadrid https://doi.org/10.5194/cp-10-537-2014 2022-05-12T20:01:26Z 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. Article in Journal/Newspaper Greenland Iceland North Atlantic North Atlantic oscillation Universidad Complutense de Madrid (UCM): E-Prints Complutense Canada Greenland Pacific Climate of the Past 10 2 537 550 |
institution |
Open Polar |
collection |
Universidad Complutense de Madrid (UCM): E-Prints Complutense |
op_collection_id |
ftunivcmadrid |
language |
English |
topic |
Astrofísica Astronomía |
spellingShingle |
Astrofísica Astronomía Raible, C. C. Lehner, F. González Rouco, J. Fidel Fernández Donado, Laura Changing correlation structures of the Northern Hemisphere atmospheric circulation from 1000 to 2100 AD |
topic_facet |
Astrofísica Astronomía |
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. |
format |
Article in Journal/Newspaper |
author |
Raible, C. C. Lehner, F. González Rouco, J. Fidel Fernández Donado, Laura |
author_facet |
Raible, C. C. Lehner, F. González Rouco, J. Fidel Fernández Donado, Laura |
author_sort |
Raible, C. C. |
title |
Changing correlation structures of the Northern Hemisphere atmospheric circulation from 1000 to 2100 AD |
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 |
publisher |
Copernicus Gesellschaft MBH |
publishDate |
2014 |
url |
https://eprints.ucm.es/id/eprint/36093/ https://eprints.ucm.es/id/eprint/36093/1/gonzalezrouco01libre%2BCC.pdf https://doi.org/10.5194/cp-10-537-2014 |
geographic |
Canada Greenland Pacific |
geographic_facet |
Canada Greenland Pacific |
genre |
Greenland Iceland North Atlantic North Atlantic oscillation |
genre_facet |
Greenland Iceland North Atlantic North Atlantic oscillation |
op_relation |
https://eprints.ucm.es/id/eprint/36093/1/gonzalezrouco01libre%2BCC.pdf |
op_rights |
cc_by info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/cp-10-537-2014 |
container_title |
Climate of the Past |
container_volume |
10 |
container_issue |
2 |
container_start_page |
537 |
op_container_end_page |
550 |
_version_ |
1766019791098740736 |