ENSO-Related variability of the southern hemisphere winter storm track over the eastern Pacific–Atlantic sector

Autores
Solman, Silvina Alicia; Menendez, Claudio Guillermo
Año de publicación
2002
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The interannual variability associated with the ENSO of winter storm tracks over the region extending from the eastern South Pacific Ocean across South America to the South Atlantic Ocean is described using 39 yr of data from the NCEP reanalysis data base. Tropical sea surface temperature anomalies associated with ENSO induce large-scale atmospheric circulation anomalies over large areas of the Southern Hemisphere. In particular, positive height anomalies dominate the Bellingshausen Sea during warm events, and consistently, a weakening of the eddy activity at low levels is found to the west of the Antarctic Peninsula. During El Nin˜o (EN) the storm track evidences an equatorward shift over the subtropical Pacific Ocean and a slight strengthening in the central Atlantic Ocean. Time-lagged correlation analysis applied to anomalies of the 300-hPa meridional wind at selected base points was used to study the structure and propagation characteristics of the waves. During EN, waves emanating from the Atlantic–Indian Ocean storm tracks tend to propagate preferably along the subpolar branch of the Pacific Ocean storm track near Australia. Over the subtropical Pacific Ocean the wave train propagates along a northern path compared with cold events consistent with an equatorward shift of the axis of maximum baroclinicity. Additionally, large eddy activity at lower levels but weak eddy activity at upper levels were found for that region. During La Nin˜a (LN), wave packets propagate more coherently along the subtropical branch of the storm track over the South Pacific Ocean, attaining larger amplitudes at upper levels and developing over broader latitudes compared to the warm phase. A poleward deflection of subtropical waves and northeastward deflection of subpolar waves are also found for LN. Waves propagating through the Atlantic Ocean storm track evolve from the subtropical branch of the Pacific Ocean storm track for LN winters and from both the subtropical jet and the subpolar latitudes for EN. Time-lagged correlation analysis applied to anomalies of the 300 hPa meridional wind at selected base points was used to study the structure and propagation charactersistics of the waves. During EN waves emanating from the Atlantic-Indian Ocean storm tracks tend to propagate preferably along the subpolar branch of the Pacific Ocean storm track near Australia.  Over the subtropical Pacific Ocean the wave train propagates along a northern path compared with cold events consistent with an equatorward shift of the axis of maximum baroclinicity. Additionally, large eddy activity at lower levels but weak eddy activity at upper levels were found for that region. During La Niña (LN) wave packets propagate more coherently along the subtropical branch of the storm track over the South Pacific Ocean, attaining larger amplitudes at upper levels and developing over broader latitudes compared to the warm phase. A poleward deflection of subtropical waves and northeastwards deflection of subpolar waves are also found for LN. Waves propagating through the Atlantic Ocean storm track evolve from the subtropical branch of the Pacific Ocean stomr track for LN winters and from both the subtropical jet and the subpolar latitudes for EN.
Fil: Solman, Silvina Alicia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos; Argentina
Fil: Menendez, Claudio Guillermo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; Argentina
Materia
ENSO
HEMISFERIO DUR
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/147563

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spelling ENSO-Related variability of the southern hemisphere winter storm track over the eastern Pacific–Atlantic sectorSolman, Silvina AliciaMenendez, Claudio GuillermoENSOHEMISFERIO DURhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The interannual variability associated with the ENSO of winter storm tracks over the region extending from the eastern South Pacific Ocean across South America to the South Atlantic Ocean is described using 39 yr of data from the NCEP reanalysis data base. Tropical sea surface temperature anomalies associated with ENSO induce large-scale atmospheric circulation anomalies over large areas of the Southern Hemisphere. In particular, positive height anomalies dominate the Bellingshausen Sea during warm events, and consistently, a weakening of the eddy activity at low levels is found to the west of the Antarctic Peninsula. During El Nin˜o (EN) the storm track evidences an equatorward shift over the subtropical Pacific Ocean and a slight strengthening in the central Atlantic Ocean. Time-lagged correlation analysis applied to anomalies of the 300-hPa meridional wind at selected base points was used to study the structure and propagation characteristics of the waves. During EN, waves emanating from the Atlantic–Indian Ocean storm tracks tend to propagate preferably along the subpolar branch of the Pacific Ocean storm track near Australia. Over the subtropical Pacific Ocean the wave train propagates along a northern path compared with cold events consistent with an equatorward shift of the axis of maximum baroclinicity. Additionally, large eddy activity at lower levels but weak eddy activity at upper levels were found for that region. During La Nin˜a (LN), wave packets propagate more coherently along the subtropical branch of the storm track over the South Pacific Ocean, attaining larger amplitudes at upper levels and developing over broader latitudes compared to the warm phase. A poleward deflection of subtropical waves and northeastward deflection of subpolar waves are also found for LN. Waves propagating through the Atlantic Ocean storm track evolve from the subtropical branch of the Pacific Ocean storm track for LN winters and from both the subtropical jet and the subpolar latitudes for EN. Time-lagged correlation analysis applied to anomalies of the 300 hPa meridional wind at selected base points was used to study the structure and propagation charactersistics of the waves. During EN waves emanating from the Atlantic-Indian Ocean storm tracks tend to propagate preferably along the subpolar branch of the Pacific Ocean storm track near Australia.  Over the subtropical Pacific Ocean the wave train propagates along a northern path compared with cold events consistent with an equatorward shift of the axis of maximum baroclinicity. Additionally, large eddy activity at lower levels but weak eddy activity at upper levels were found for that region. During La Niña (LN) wave packets propagate more coherently along the subtropical branch of the storm track over the South Pacific Ocean, attaining larger amplitudes at upper levels and developing over broader latitudes compared to the warm phase. A poleward deflection of subtropical waves and northeastwards deflection of subpolar waves are also found for LN. Waves propagating through the Atlantic Ocean storm track evolve from the subtropical branch of the Pacific Ocean stomr track for LN winters and from both the subtropical jet and the subpolar latitudes for EN.Fil: Solman, Silvina Alicia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos; ArgentinaFil: Menendez, Claudio Guillermo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; ArgentinaAmer Meteorological Soc2002-07-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/147563Solman, Silvina Alicia; Menendez, Claudio Guillermo; ENSO-Related variability of the southern hemisphere winter storm track over the eastern Pacific–Atlantic sector; Amer Meteorological Soc; Journal of The Atmospheric Sciences; 59; 13; 01-7-2002; 2128-21410022-49281520-0469CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1175/1520-0469(2002)059<2128:ERVOTS>2.0.CO;2info:eu-repo/semantics/altIdentifier/url/https://journals.ametsoc.org/view/journals/atsc/59/13/1520-0469_2002_059_2128_ervots_2.0.co_2.xmlinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:45:59Zoai:ri.conicet.gov.ar:11336/147563instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 09:45:59.927CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv ENSO-Related variability of the southern hemisphere winter storm track over the eastern Pacific–Atlantic sector
title ENSO-Related variability of the southern hemisphere winter storm track over the eastern Pacific–Atlantic sector
spellingShingle ENSO-Related variability of the southern hemisphere winter storm track over the eastern Pacific–Atlantic sector
Solman, Silvina Alicia
ENSO
HEMISFERIO DUR
title_short ENSO-Related variability of the southern hemisphere winter storm track over the eastern Pacific–Atlantic sector
title_full ENSO-Related variability of the southern hemisphere winter storm track over the eastern Pacific–Atlantic sector
title_fullStr ENSO-Related variability of the southern hemisphere winter storm track over the eastern Pacific–Atlantic sector
title_full_unstemmed ENSO-Related variability of the southern hemisphere winter storm track over the eastern Pacific–Atlantic sector
title_sort ENSO-Related variability of the southern hemisphere winter storm track over the eastern Pacific–Atlantic sector
dc.creator.none.fl_str_mv Solman, Silvina Alicia
Menendez, Claudio Guillermo
author Solman, Silvina Alicia
author_facet Solman, Silvina Alicia
Menendez, Claudio Guillermo
author_role author
author2 Menendez, Claudio Guillermo
author2_role author
dc.subject.none.fl_str_mv ENSO
HEMISFERIO DUR
topic ENSO
HEMISFERIO DUR
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The interannual variability associated with the ENSO of winter storm tracks over the region extending from the eastern South Pacific Ocean across South America to the South Atlantic Ocean is described using 39 yr of data from the NCEP reanalysis data base. Tropical sea surface temperature anomalies associated with ENSO induce large-scale atmospheric circulation anomalies over large areas of the Southern Hemisphere. In particular, positive height anomalies dominate the Bellingshausen Sea during warm events, and consistently, a weakening of the eddy activity at low levels is found to the west of the Antarctic Peninsula. During El Nin˜o (EN) the storm track evidences an equatorward shift over the subtropical Pacific Ocean and a slight strengthening in the central Atlantic Ocean. Time-lagged correlation analysis applied to anomalies of the 300-hPa meridional wind at selected base points was used to study the structure and propagation characteristics of the waves. During EN, waves emanating from the Atlantic–Indian Ocean storm tracks tend to propagate preferably along the subpolar branch of the Pacific Ocean storm track near Australia. Over the subtropical Pacific Ocean the wave train propagates along a northern path compared with cold events consistent with an equatorward shift of the axis of maximum baroclinicity. Additionally, large eddy activity at lower levels but weak eddy activity at upper levels were found for that region. During La Nin˜a (LN), wave packets propagate more coherently along the subtropical branch of the storm track over the South Pacific Ocean, attaining larger amplitudes at upper levels and developing over broader latitudes compared to the warm phase. A poleward deflection of subtropical waves and northeastward deflection of subpolar waves are also found for LN. Waves propagating through the Atlantic Ocean storm track evolve from the subtropical branch of the Pacific Ocean storm track for LN winters and from both the subtropical jet and the subpolar latitudes for EN. Time-lagged correlation analysis applied to anomalies of the 300 hPa meridional wind at selected base points was used to study the structure and propagation charactersistics of the waves. During EN waves emanating from the Atlantic-Indian Ocean storm tracks tend to propagate preferably along the subpolar branch of the Pacific Ocean storm track near Australia.  Over the subtropical Pacific Ocean the wave train propagates along a northern path compared with cold events consistent with an equatorward shift of the axis of maximum baroclinicity. Additionally, large eddy activity at lower levels but weak eddy activity at upper levels were found for that region. During La Niña (LN) wave packets propagate more coherently along the subtropical branch of the storm track over the South Pacific Ocean, attaining larger amplitudes at upper levels and developing over broader latitudes compared to the warm phase. A poleward deflection of subtropical waves and northeastwards deflection of subpolar waves are also found for LN. Waves propagating through the Atlantic Ocean storm track evolve from the subtropical branch of the Pacific Ocean stomr track for LN winters and from both the subtropical jet and the subpolar latitudes for EN.
Fil: Solman, Silvina Alicia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos; Argentina
Fil: Menendez, Claudio Guillermo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; Argentina
description The interannual variability associated with the ENSO of winter storm tracks over the region extending from the eastern South Pacific Ocean across South America to the South Atlantic Ocean is described using 39 yr of data from the NCEP reanalysis data base. Tropical sea surface temperature anomalies associated with ENSO induce large-scale atmospheric circulation anomalies over large areas of the Southern Hemisphere. In particular, positive height anomalies dominate the Bellingshausen Sea during warm events, and consistently, a weakening of the eddy activity at low levels is found to the west of the Antarctic Peninsula. During El Nin˜o (EN) the storm track evidences an equatorward shift over the subtropical Pacific Ocean and a slight strengthening in the central Atlantic Ocean. Time-lagged correlation analysis applied to anomalies of the 300-hPa meridional wind at selected base points was used to study the structure and propagation characteristics of the waves. During EN, waves emanating from the Atlantic–Indian Ocean storm tracks tend to propagate preferably along the subpolar branch of the Pacific Ocean storm track near Australia. Over the subtropical Pacific Ocean the wave train propagates along a northern path compared with cold events consistent with an equatorward shift of the axis of maximum baroclinicity. Additionally, large eddy activity at lower levels but weak eddy activity at upper levels were found for that region. During La Nin˜a (LN), wave packets propagate more coherently along the subtropical branch of the storm track over the South Pacific Ocean, attaining larger amplitudes at upper levels and developing over broader latitudes compared to the warm phase. A poleward deflection of subtropical waves and northeastward deflection of subpolar waves are also found for LN. Waves propagating through the Atlantic Ocean storm track evolve from the subtropical branch of the Pacific Ocean storm track for LN winters and from both the subtropical jet and the subpolar latitudes for EN. Time-lagged correlation analysis applied to anomalies of the 300 hPa meridional wind at selected base points was used to study the structure and propagation charactersistics of the waves. During EN waves emanating from the Atlantic-Indian Ocean storm tracks tend to propagate preferably along the subpolar branch of the Pacific Ocean storm track near Australia.  Over the subtropical Pacific Ocean the wave train propagates along a northern path compared with cold events consistent with an equatorward shift of the axis of maximum baroclinicity. Additionally, large eddy activity at lower levels but weak eddy activity at upper levels were found for that region. During La Niña (LN) wave packets propagate more coherently along the subtropical branch of the storm track over the South Pacific Ocean, attaining larger amplitudes at upper levels and developing over broader latitudes compared to the warm phase. A poleward deflection of subtropical waves and northeastwards deflection of subpolar waves are also found for LN. Waves propagating through the Atlantic Ocean storm track evolve from the subtropical branch of the Pacific Ocean stomr track for LN winters and from both the subtropical jet and the subpolar latitudes for EN.
publishDate 2002
dc.date.none.fl_str_mv 2002-07-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/147563
Solman, Silvina Alicia; Menendez, Claudio Guillermo; ENSO-Related variability of the southern hemisphere winter storm track over the eastern Pacific–Atlantic sector; Amer Meteorological Soc; Journal of The Atmospheric Sciences; 59; 13; 01-7-2002; 2128-2141
0022-4928
1520-0469
CONICET Digital
CONICET
url http://hdl.handle.net/11336/147563
identifier_str_mv Solman, Silvina Alicia; Menendez, Claudio Guillermo; ENSO-Related variability of the southern hemisphere winter storm track over the eastern Pacific–Atlantic sector; Amer Meteorological Soc; Journal of The Atmospheric Sciences; 59; 13; 01-7-2002; 2128-2141
0022-4928
1520-0469
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1175/1520-0469(2002)059<2128:ERVOTS>2.0.CO;2
info:eu-repo/semantics/altIdentifier/url/https://journals.ametsoc.org/view/journals/atsc/59/13/1520-0469_2002_059_2128_ervots_2.0.co_2.xml
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Amer Meteorological Soc
publisher.none.fl_str_mv Amer Meteorological Soc
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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