Sensitivity of the boreal winter circulation in the middle atmosphere to the quasi-biennial oscillation in MAECHAM5 simulations

The polar vortex in the Northern Hemisphere exhibits high intraseasonal and interannual variability which, to some degree, may be controlled by the quasi-biennial oscillation (QBO) in the tropical stratosphere. Here we analyze the QBO signal in the Northern Hemisphere polar vortex in a model simulat...

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Detalles Bibliográficos
Autores: Calvo Fernández, Natalia, Giorgetta, M. A., Peña Ortiz, C.
Tipo de recurso: artículo
Fecha de publicación:2007
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/51074
Acceso en línea:https://hdl.handle.net/20.500.14352/51074
Access Level:acceso abierto
Palabra clave:52
Northern-hemisphere winter
Stratospheric sudden warmings
Solar-cycle
Planetary-waves
Interannual variability
Equatorial QBO
Troposphere
Model
Winds
Propagation
Astrofísica
Astronomía (Física)
Física atmosférica
2501 Ciencias de la Atmósfera
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oai_identifier_str oai:docta.ucm.es:20.500.14352/51074
network_acronym_str ES
network_name_str España
repository_id_str
spelling Sensitivity of the boreal winter circulation in the middle atmosphere to the quasi-biennial oscillation in MAECHAM5 simulationsCalvo Fernández, NataliaGiorgetta, M. A.Peña Ortiz, C.52Northern-hemisphere winterStratospheric sudden warmingsSolar-cyclePlanetary-wavesInterannual variabilityEquatorial QBOTroposphereModelWindsPropagationAstrofísicaAstronomía (Física)Física atmosférica2501 Ciencias de la AtmósferaThe polar vortex in the Northern Hemisphere exhibits high intraseasonal and interannual variability which, to some degree, may be controlled by the quasi-biennial oscillation (QBO) in the tropical stratosphere. Here we analyze the QBO signal in the Northern Hemisphere polar vortex in a model simulation using the general circulation model MAECHAM5 ( Middle Atmosphere European Center Hamburg Model), which simulates the QBO as an internal mode of variability. Composites have been computed for the westerly and easterly QBO phases from early winter to late winter ( November December, December - January and January - February) of a 50-year experiment containing 20 complete QBO cycles. This method identifies tropical and midlatitude patterns in wind and temperature that are related to the secondary meridional circulation of the QBO extending towards the winter pole. In the tropics, significant QBO signature is observed in the mesosphere up to 0.05 hPa only in early winter and mainly in the easterly QBO phase forced by the parameterized gravity waves-mean flow interaction. At high latitudes, MAECHAM5 shows a significantly warmer (colder) polar stratosphere in the easterly ( westerly) QBO phase at 30 hPa accompanied by a weaker ( stronger) polar vortex in the late winter months, from December to February ( December to January) in the easterly ( westerly) phase of the QBO. In early winter there is no significant change in temperature and zonal mean zonal wind in the polar stratosphere. The analysis of EP fluxes shows a different behavior between QBO phases, with changes in the waveguide. Wave propagation occurs upwards and polewards in the easterly QBO phase at 30 hPa, while waves are refracted equatorward in the westerly phase. No relationship has been found between the tropical QBO and the final warming at the end of the boreal winter.American Geophysical UnionUniversidad Complutense de Madrid20072007-05-3020072007-05-30journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/51074reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/510742026-06-02T12:44:21Z
dc.title.none.fl_str_mv Sensitivity of the boreal winter circulation in the middle atmosphere to the quasi-biennial oscillation in MAECHAM5 simulations
title Sensitivity of the boreal winter circulation in the middle atmosphere to the quasi-biennial oscillation in MAECHAM5 simulations
spellingShingle Sensitivity of the boreal winter circulation in the middle atmosphere to the quasi-biennial oscillation in MAECHAM5 simulations
Calvo Fernández, Natalia
52
Northern-hemisphere winter
Stratospheric sudden warmings
Solar-cycle
Planetary-waves
Interannual variability
Equatorial QBO
Troposphere
Model
Winds
Propagation
Astrofísica
Astronomía (Física)
Física atmosférica
2501 Ciencias de la Atmósfera
title_short Sensitivity of the boreal winter circulation in the middle atmosphere to the quasi-biennial oscillation in MAECHAM5 simulations
title_full Sensitivity of the boreal winter circulation in the middle atmosphere to the quasi-biennial oscillation in MAECHAM5 simulations
title_fullStr Sensitivity of the boreal winter circulation in the middle atmosphere to the quasi-biennial oscillation in MAECHAM5 simulations
title_full_unstemmed Sensitivity of the boreal winter circulation in the middle atmosphere to the quasi-biennial oscillation in MAECHAM5 simulations
title_sort Sensitivity of the boreal winter circulation in the middle atmosphere to the quasi-biennial oscillation in MAECHAM5 simulations
dc.creator.none.fl_str_mv Calvo Fernández, Natalia
Giorgetta, M. A.
Peña Ortiz, C.
author Calvo Fernández, Natalia
author_facet Calvo Fernández, Natalia
Giorgetta, M. A.
Peña Ortiz, C.
author_role author
author2 Giorgetta, M. A.
Peña Ortiz, C.
author2_role author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 52
Northern-hemisphere winter
Stratospheric sudden warmings
Solar-cycle
Planetary-waves
Interannual variability
Equatorial QBO
Troposphere
Model
Winds
Propagation
Astrofísica
Astronomía (Física)
Física atmosférica
2501 Ciencias de la Atmósfera
topic 52
Northern-hemisphere winter
Stratospheric sudden warmings
Solar-cycle
Planetary-waves
Interannual variability
Equatorial QBO
Troposphere
Model
Winds
Propagation
Astrofísica
Astronomía (Física)
Física atmosférica
2501 Ciencias de la Atmósfera
description The polar vortex in the Northern Hemisphere exhibits high intraseasonal and interannual variability which, to some degree, may be controlled by the quasi-biennial oscillation (QBO) in the tropical stratosphere. Here we analyze the QBO signal in the Northern Hemisphere polar vortex in a model simulation using the general circulation model MAECHAM5 ( Middle Atmosphere European Center Hamburg Model), which simulates the QBO as an internal mode of variability. Composites have been computed for the westerly and easterly QBO phases from early winter to late winter ( November December, December - January and January - February) of a 50-year experiment containing 20 complete QBO cycles. This method identifies tropical and midlatitude patterns in wind and temperature that are related to the secondary meridional circulation of the QBO extending towards the winter pole. In the tropics, significant QBO signature is observed in the mesosphere up to 0.05 hPa only in early winter and mainly in the easterly QBO phase forced by the parameterized gravity waves-mean flow interaction. At high latitudes, MAECHAM5 shows a significantly warmer (colder) polar stratosphere in the easterly ( westerly) QBO phase at 30 hPa accompanied by a weaker ( stronger) polar vortex in the late winter months, from December to February ( December to January) in the easterly ( westerly) phase of the QBO. In early winter there is no significant change in temperature and zonal mean zonal wind in the polar stratosphere. The analysis of EP fluxes shows a different behavior between QBO phases, with changes in the waveguide. Wave propagation occurs upwards and polewards in the easterly QBO phase at 30 hPa, while waves are refracted equatorward in the westerly phase. No relationship has been found between the tropical QBO and the final warming at the end of the boreal winter.
publishDate 2007
dc.date.none.fl_str_mv 2007
2007-05-30
2007
2007-05-30
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/20.500.14352/51074
url https://hdl.handle.net/20.500.14352/51074
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
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
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Geophysical Union
publisher.none.fl_str_mv American Geophysical Union
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
_version_ 1869422743258136576
score 15.300719

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