Strong superrotation at high CO_(2) in an idealized terrestrial aquaplanet

Equatorial superrotation in the upper troposphere is shown to strengthen with increasing carbon dioxide (CO_(2)) in an idealized global atmospheric model. The model is run in aquaplanet mode over a shallow slab ocean and includes a full hydrological cycle with latent heat release and clear-sky radia...

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Detalhes bibliográficos
Autores: Zurita Gotor, Pablo, Held, Isaac M.
Formato: artículo
Fecha de publicación:2025
País:España
Recursos:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/125783
Acesso em linha:https://hdl.handle.net/20.500.14352/125783
Access Level:acceso embargado
Palavra-chave:551.5
Atmospheric circulation
Kelvin waves
Momentum
Climate change
Idealized models
Meteorología (Física)
2509 Meteorología
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spelling Strong superrotation at high CO_(2) in an idealized terrestrial aquaplanetZurita Gotor, PabloHeld, Isaac M.551.5Atmospheric circulationKelvin wavesMomentumClimate changeIdealized modelsMeteorología (Física)2509 MeteorologíaEquatorial superrotation in the upper troposphere is shown to strengthen with increasing carbon dioxide (CO_(2)) in an idealized global atmospheric model. The model is run in aquaplanet mode over a shallow slab ocean and includes a full hydrological cycle with latent heat release and clear-sky radiative transfer but no parameterized deep convection. The degree of superrotation is explained quantitatively by balancing 1) the acceleration of the equatorial westerlies by the component of the horizontal eddy angular momentum flux convergence associated with divergent flow with 2) deceleration due to the vertical transport of low angular momentum air from the surface in the intertropical convergence zone. Both the weakening of the equatorial upward motion and the strengthening of the horizontal flux convergence due to divergent eddies are important for the strengthening of superrotation with increasing CO_(2). The control climate has no Madden–Julian oscillation (MJO), so the strengthening of the equatorial eddy momentum flux convergence cannot be described as due to the increasing amplitude of the MJO with warming. Rather, this acceleration is associated with the interaction between an equatorial Kelvin wave and extratropical Rossby waves. The degree of superrotation at high CO_(2) decreases monotonically as the resolution of the spectral model is increased from T42 to T213, with a suggestion of convergence at the higher resolutions. Simulations that incorporate a convective parameterization frequently utilized in this type of idealized model show no superrotation.American Meteorological SocietyUniversidad Complutense de Madrid20252025-01-0120252025-01-01journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/125783reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)InglésengAgencia Estatal de Investigación http://dx.doi.org/10.13039/501100011033 Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023 PID2022-136316NB-I00 INVESTIGACION DEL IMPACTO DE LA INTERACCION DE KELVIN-ROSSBY EN LA CIRCULACION GENERAL ATMOSFERICAembargoed accesshttp://purl.org/coar/access_right/c_f1cfinfo:eu-repo/semantics/embargoedAccessoai:docta.ucm.es:20.500.14352/1257832026-06-02T12:44:21Z
dc.title.none.fl_str_mv Strong superrotation at high CO_(2) in an idealized terrestrial aquaplanet
title Strong superrotation at high CO_(2) in an idealized terrestrial aquaplanet
spellingShingle Strong superrotation at high CO_(2) in an idealized terrestrial aquaplanet
Zurita Gotor, Pablo
551.5
Atmospheric circulation
Kelvin waves
Momentum
Climate change
Idealized models
Meteorología (Física)
2509 Meteorología
title_short Strong superrotation at high CO_(2) in an idealized terrestrial aquaplanet
title_full Strong superrotation at high CO_(2) in an idealized terrestrial aquaplanet
title_fullStr Strong superrotation at high CO_(2) in an idealized terrestrial aquaplanet
title_full_unstemmed Strong superrotation at high CO_(2) in an idealized terrestrial aquaplanet
title_sort Strong superrotation at high CO_(2) in an idealized terrestrial aquaplanet
dc.creator.none.fl_str_mv Zurita Gotor, Pablo
Held, Isaac M.
author Zurita Gotor, Pablo
author_facet Zurita Gotor, Pablo
Held, Isaac M.
author_role author
author2 Held, Isaac M.
author2_role author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 551.5
Atmospheric circulation
Kelvin waves
Momentum
Climate change
Idealized models
Meteorología (Física)
2509 Meteorología
topic 551.5
Atmospheric circulation
Kelvin waves
Momentum
Climate change
Idealized models
Meteorología (Física)
2509 Meteorología
description Equatorial superrotation in the upper troposphere is shown to strengthen with increasing carbon dioxide (CO_(2)) in an idealized global atmospheric model. The model is run in aquaplanet mode over a shallow slab ocean and includes a full hydrological cycle with latent heat release and clear-sky radiative transfer but no parameterized deep convection. The degree of superrotation is explained quantitatively by balancing 1) the acceleration of the equatorial westerlies by the component of the horizontal eddy angular momentum flux convergence associated with divergent flow with 2) deceleration due to the vertical transport of low angular momentum air from the surface in the intertropical convergence zone. Both the weakening of the equatorial upward motion and the strengthening of the horizontal flux convergence due to divergent eddies are important for the strengthening of superrotation with increasing CO_(2). The control climate has no Madden–Julian oscillation (MJO), so the strengthening of the equatorial eddy momentum flux convergence cannot be described as due to the increasing amplitude of the MJO with warming. Rather, this acceleration is associated with the interaction between an equatorial Kelvin wave and extratropical Rossby waves. The degree of superrotation at high CO_(2) decreases monotonically as the resolution of the spectral model is increased from T42 to T213, with a suggestion of convergence at the higher resolutions. Simulations that incorporate a convective parameterization frequently utilized in this type of idealized model show no superrotation.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025-01-01
2025
2025-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/125783
url https://hdl.handle.net/20.500.14352/125783
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv Agencia Estatal de Investigación http://dx.doi.org/10.13039/501100011033 Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023 PID2022-136316NB-I00 INVESTIGACION DEL IMPACTO DE LA INTERACCION DE KELVIN-ROSSBY EN LA CIRCULACION GENERAL ATMOSFERICA
dc.rights.none.fl_str_mv embargoed access
http://purl.org/coar/access_right/c_f1cf
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/embargoedAccess
rights_invalid_str_mv embargoed access
http://purl.org/coar/access_right/c_f1cf
eu_rights_str_mv embargoedAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Meteorological Society
publisher.none.fl_str_mv American Meteorological Society
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 15,81155

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