Quantifying tracer transport in the tropical lower stratosphere using WACCM

The zonal mean transport of ozone and carbon monoxide (CO) near the tropical tropopause is investigated using the Whole-Atmosphere Community Climate Model version 4 (WACCM4). The variability in temperature, ozone and CO in the model shows good agreement with satellite and balloon observations. Model...

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Detalles Bibliográficos
Autores: Ábalos Álvarez, Marta, Randel, W. J., Kinnison, D. E., Serrano Mendoza, Encarnación
Tipo de recurso: artículo
Fecha de publicación:2013
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/108517
Acceso en línea:https://hdl.handle.net/20.500.14352/108517
Access Level:acceso abierto
Palabra clave:551.51
Annual cycle
Efective diffusivity
Upper troposhere
Tropopause
Variability
Ozone
Model
Física atmosférica
2501 Ciencias de la Atmósfera
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oai_identifier_str oai:docta.ucm.es:20.500.14352/108517
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network_name_str España
repository_id_str
spelling Quantifying tracer transport in the tropical lower stratosphere using WACCMÁbalos Álvarez, MartaRandel, W. J.Kinnison, D. E.Serrano Mendoza, Encarnación551.51Annual cycleEfective diffusivityUpper troposhereTropopauseVariabilityOzoneModelFísica atmosférica2501 Ciencias de la AtmósferaThe zonal mean transport of ozone and carbon monoxide (CO) near the tropical tropopause is investigated using the Whole-Atmosphere Community Climate Model version 4 (WACCM4). The variability in temperature, ozone and CO in the model shows good agreement with satellite and balloon observations. Modeled temperature and tracers exhibit large and closely coupled annual cycles in the tropical lower stratosphere, as in the observations. The thermodynamic and tracer budgets in the model are analyzed based on the Transformed Eulerian Mean (TEM) framework on log-pressure coordinates and also using the isentropic formulation. Results show that the coupled seasonal cycles are mainly forced by tropical upwelling over altitudes with large vertical tracer gradients, in agreement with previous observational studies. The model also allows explicit calculation of eddy transport terms, which make an important contribution to ozone tendencies in the tropical lower stratosphere. The character of the eddy fluxes changes with altitude. At higher levels (similar to 2 km above the cold point tropopause), isentropic eddy transport occurs during winter and spring in each hemisphere in the sub-tropics, associated with transient Rossby waves acting on strong background latitudinal gradients. At lower altitudes, close to the tropical tropopause, there is a maximum in horizontal eddy transport during boreal summer associated with the Asian monsoon anticyclone. Sub-seasonal variability in ozone and CO, tied to fluctuations in temperature, is primarily driven by transient tropical upwelling. In isentropic coordinates, the overall tracer budgets are similar to the log-pressure results, highlighting cross-isentropic advection as the main term in the time-mean balance, with large seasonality above the tropopause. However, in isentropic coordinates the tracer variability is largely reduced on both seasonal and sub-seasonal timescales, because tracer fluctuations are highly correlated with temperature (as a response to upwelling).CopernicusUniversidad Complutense de Madrid20132013-11-0120132013-11-01journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/108517reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)InglésengMinisterio de Ciencia e Innovación http://dx.doi.org/10.13039/501100004837 Not available BES-2009-013082 BES-2009-013082open accesshttp://purl.org/coar/access_right/c_abf2Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/1085172026-06-02T12:44:21Z
dc.title.none.fl_str_mv Quantifying tracer transport in the tropical lower stratosphere using WACCM
title Quantifying tracer transport in the tropical lower stratosphere using WACCM
spellingShingle Quantifying tracer transport in the tropical lower stratosphere using WACCM
Ábalos Álvarez, Marta
551.51
Annual cycle
Efective diffusivity
Upper troposhere
Tropopause
Variability
Ozone
Model
Física atmosférica
2501 Ciencias de la Atmósfera
title_short Quantifying tracer transport in the tropical lower stratosphere using WACCM
title_full Quantifying tracer transport in the tropical lower stratosphere using WACCM
title_fullStr Quantifying tracer transport in the tropical lower stratosphere using WACCM
title_full_unstemmed Quantifying tracer transport in the tropical lower stratosphere using WACCM
title_sort Quantifying tracer transport in the tropical lower stratosphere using WACCM
dc.creator.none.fl_str_mv Ábalos Álvarez, Marta
Randel, W. J.
Kinnison, D. E.
Serrano Mendoza, Encarnación
author Ábalos Álvarez, Marta
author_facet Ábalos Álvarez, Marta
Randel, W. J.
Kinnison, D. E.
Serrano Mendoza, Encarnación
author_role author
author2 Randel, W. J.
Kinnison, D. E.
Serrano Mendoza, Encarnación
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 551.51
Annual cycle
Efective diffusivity
Upper troposhere
Tropopause
Variability
Ozone
Model
Física atmosférica
2501 Ciencias de la Atmósfera
topic 551.51
Annual cycle
Efective diffusivity
Upper troposhere
Tropopause
Variability
Ozone
Model
Física atmosférica
2501 Ciencias de la Atmósfera
description The zonal mean transport of ozone and carbon monoxide (CO) near the tropical tropopause is investigated using the Whole-Atmosphere Community Climate Model version 4 (WACCM4). The variability in temperature, ozone and CO in the model shows good agreement with satellite and balloon observations. Modeled temperature and tracers exhibit large and closely coupled annual cycles in the tropical lower stratosphere, as in the observations. The thermodynamic and tracer budgets in the model are analyzed based on the Transformed Eulerian Mean (TEM) framework on log-pressure coordinates and also using the isentropic formulation. Results show that the coupled seasonal cycles are mainly forced by tropical upwelling over altitudes with large vertical tracer gradients, in agreement with previous observational studies. The model also allows explicit calculation of eddy transport terms, which make an important contribution to ozone tendencies in the tropical lower stratosphere. The character of the eddy fluxes changes with altitude. At higher levels (similar to 2 km above the cold point tropopause), isentropic eddy transport occurs during winter and spring in each hemisphere in the sub-tropics, associated with transient Rossby waves acting on strong background latitudinal gradients. At lower altitudes, close to the tropical tropopause, there is a maximum in horizontal eddy transport during boreal summer associated with the Asian monsoon anticyclone. Sub-seasonal variability in ozone and CO, tied to fluctuations in temperature, is primarily driven by transient tropical upwelling. In isentropic coordinates, the overall tracer budgets are similar to the log-pressure results, highlighting cross-isentropic advection as the main term in the time-mean balance, with large seasonality above the tropopause. However, in isentropic coordinates the tracer variability is largely reduced on both seasonal and sub-seasonal timescales, because tracer fluctuations are highly correlated with temperature (as a response to upwelling).
publishDate 2013
dc.date.none.fl_str_mv 2013
2013-11-01
2013
2013-11-01
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/20.500.14352/108517
url https://hdl.handle.net/20.500.14352/108517
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv Ministerio de Ciencia e Innovación http://dx.doi.org/10.13039/501100004837 Not available BES-2009-013082 BES-2009-013082
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
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
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Copernicus
publisher.none.fl_str_mv Copernicus
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_ 1869409984819757056
score 15,811543

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