Southern Hemisphere Summer Mesopause Responses to El Niño-Southern Oscillation

In the Southern Hemisphere (SH) polar region, satellite observations reveal a significant upper-mesosphere cooling and a lower-thermosphere warming during warm ENSO events in December. An opposite pattern is observed in the tropical mesopause region. The observed upper-mesosphere cooling agrees with...

Full description

Bibliographic Details
Authors: Li, Tao, Calvo Fernández, Natalia, Yue, Jia, Russell, James M., III, Smith, Anne K., Mlynczak, Martin G., Chandran, Amal, Dou, Xiankang, Liu, Alan Z.
Format: article
Publication Date:2016
Country:España
Institution:Universidad Complutense de Madrid (UCM)
Repository:Docta Complutense
Language:English
OAI Identifier:oai:docta.ucm.es:20.500.14352/19003
Online Access:https://hdl.handle.net/20.500.14352/19003
Access Level:Open access
Keyword:52
Stratosphere
Atmosphere
Middle
Model
Temperatures
Circulation
Enso
Astrofísica
Astronomía (Física)
id ES_87c4e7fbec30fb28db6da15f7e32544d
oai_identifier_str oai:docta.ucm.es:20.500.14352/19003
network_acronym_str ES
network_name_str España
repository_id_str
spelling Southern Hemisphere Summer Mesopause Responses to El Niño-Southern OscillationLi, TaoCalvo Fernández, NataliaYue, JiaRussell, James M., IIISmith, Anne K.Mlynczak, Martin G.Chandran, AmalDou, XiankangLiu, Alan Z.52StratosphereAtmosphereMiddleModelTemperaturesCirculationEnsoAstrofísicaAstronomía (Física)In the Southern Hemisphere (SH) polar region, satellite observations reveal a significant upper-mesosphere cooling and a lower-thermosphere warming during warm ENSO events in December. An opposite pattern is observed in the tropical mesopause region. The observed upper-mesosphere cooling agrees with a climate model simulation. Analysis of the simulation suggests that enhanced planetary wave (PW) dissipation in the Northern Hemisphere (NH) high-latitude stratosphere during El Nino strengthens the Brewer-Dobson circulation and cools the equatorial stratosphere. This increases the magnitude of the SH stratosphere meridional temperature gradient and thus causes the anomalous stratospheric easterly zonal wind and early breakdown of the SH stratospheric polar vortex. The resulting perturbation to gravity wave (GW) filtering causes anomalous SH mesospheric eastward GW forcing and polar upwelling and cooling. In addition, constructive inference of ENSO and quasi-biennial oscillation (QBO) could lead to stronger stratospheric easterly zonal wind anomalies at the SH high latitudes in November and December and early breakdown of the SH stratospheric polar vortex during warm ENSO events in the easterly QBO phase (defined by the equatorial zonal wind at similar to 25 hPa). This would in turn cause much more SH mesospheric eastward GW forcing and much colder polar temperatures, and hence it would induce an early onset time of SH summer polar mesospheric clouds (PMCs). The opposite mechanism occurs during cold ENSO events in the westerly QBO phase. This implies that ENSO together with QBO could significantly modulate the breakdown time of SH stratospheric polar vortex and the onset time of SH PMC.American Meteorological SocietyUniversidad Complutense de Madrid20162016-09-0120162016-09-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/19003reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/190032026-06-02T12:44:21Z
dc.title.none.fl_str_mv Southern Hemisphere Summer Mesopause Responses to El Niño-Southern Oscillation
title Southern Hemisphere Summer Mesopause Responses to El Niño-Southern Oscillation
spellingShingle Southern Hemisphere Summer Mesopause Responses to El Niño-Southern Oscillation
Li, Tao
52
Stratosphere
Atmosphere
Middle
Model
Temperatures
Circulation
Enso
Astrofísica
Astronomía (Física)
title_short Southern Hemisphere Summer Mesopause Responses to El Niño-Southern Oscillation
title_full Southern Hemisphere Summer Mesopause Responses to El Niño-Southern Oscillation
title_fullStr Southern Hemisphere Summer Mesopause Responses to El Niño-Southern Oscillation
title_full_unstemmed Southern Hemisphere Summer Mesopause Responses to El Niño-Southern Oscillation
title_sort Southern Hemisphere Summer Mesopause Responses to El Niño-Southern Oscillation
dc.creator.none.fl_str_mv Li, Tao
Calvo Fernández, Natalia
Yue, Jia
Russell, James M., III
Smith, Anne K.
Mlynczak, Martin G.
Chandran, Amal
Dou, Xiankang
Liu, Alan Z.
author Li, Tao
author_facet Li, Tao
Calvo Fernández, Natalia
Yue, Jia
Russell, James M., III
Smith, Anne K.
Mlynczak, Martin G.
Chandran, Amal
Dou, Xiankang
Liu, Alan Z.
author_role author
author2 Calvo Fernández, Natalia
Yue, Jia
Russell, James M., III
Smith, Anne K.
Mlynczak, Martin G.
Chandran, Amal
Dou, Xiankang
Liu, Alan Z.
author2_role author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 52
Stratosphere
Atmosphere
Middle
Model
Temperatures
Circulation
Enso
Astrofísica
Astronomía (Física)
topic 52
Stratosphere
Atmosphere
Middle
Model
Temperatures
Circulation
Enso
Astrofísica
Astronomía (Física)
description In the Southern Hemisphere (SH) polar region, satellite observations reveal a significant upper-mesosphere cooling and a lower-thermosphere warming during warm ENSO events in December. An opposite pattern is observed in the tropical mesopause region. The observed upper-mesosphere cooling agrees with a climate model simulation. Analysis of the simulation suggests that enhanced planetary wave (PW) dissipation in the Northern Hemisphere (NH) high-latitude stratosphere during El Nino strengthens the Brewer-Dobson circulation and cools the equatorial stratosphere. This increases the magnitude of the SH stratosphere meridional temperature gradient and thus causes the anomalous stratospheric easterly zonal wind and early breakdown of the SH stratospheric polar vortex. The resulting perturbation to gravity wave (GW) filtering causes anomalous SH mesospheric eastward GW forcing and polar upwelling and cooling. In addition, constructive inference of ENSO and quasi-biennial oscillation (QBO) could lead to stronger stratospheric easterly zonal wind anomalies at the SH high latitudes in November and December and early breakdown of the SH stratospheric polar vortex during warm ENSO events in the easterly QBO phase (defined by the equatorial zonal wind at similar to 25 hPa). This would in turn cause much more SH mesospheric eastward GW forcing and much colder polar temperatures, and hence it would induce an early onset time of SH summer polar mesospheric clouds (PMCs). The opposite mechanism occurs during cold ENSO events in the westerly QBO phase. This implies that ENSO together with QBO could significantly modulate the breakdown time of SH stratospheric polar vortex and the onset time of SH PMC.
publishDate 2016
dc.date.none.fl_str_mv 2016
2016-09-01
2016
2016-09-01
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/20.500.14352/19003
url https://hdl.handle.net/20.500.14352/19003
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 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
_version_ 1869412486573195264
score 15,300724

Similar Items