Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South America

Autores
Saurral, Ramiro Ignacio; Camilloni, Ines Angela; Barros, Vicente Ricardo
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
This paper quantifies the relationship between sea ice cover (SIC) on the Southern Ocean precipitation and river discharges over southeastern and eastern South America. The period of analysis covers from 1981 to 2008 and includes monthly mean data of SIC over the Ross, Amundsen-Bellingshausen and Weddell Seas, atmospheric variables and discharges of selected river in eastern South America. To isolate the effect of known modes of climate variability on SIC, the signals of El Nino-Southern Oscillation and the Southern Annual Mode are removed from all time series through regression analysis. Composites of precipitation differences over South America reveal a pattern of enhanced rainfall activity over the South Atlantic Convergence Zone (SACZ) in summer (JFM) when SIC is above average particularly over the Weddell Sea area, while winter (ASO) SIC anomalies show negative and significant correlations with rainfall over much of South America. Moisture fluxes patterns in summer reveal increased moisture transport towards the SACZ region and decreased low-level jet activity (and precipitation) over northern Argentina. In particular a large dry bias over southeastern South America associated to positive SIC anomalies on the Weddell Sea in September is shown to impact the discharges of the Uruguay and Iguazu Rivers, with the largest effects found two months after the SIC anomaly (November). Although less robust, a relationship with the Parana River is also found. These results suggest that increased SIC over the Weddell Sea during September can help to forecast drier conditions particularly on the Uruguay basin and somewhat wetter conditions in the SACZ region within the following season.
Fil: Saurral, Ramiro Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera; Argentina
Fil: Camilloni, Ines Angela. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera; Argentina
Fil: Barros, Vicente Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera; Argentina
Materia
Sea-Ice Variability
South American Climate
Precipitation
Rivers
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:11336/4510
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/4510
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South AmericaSaurral, Ramiro IgnacioCamilloni, Ines AngelaBarros, Vicente RicardoSea-Ice VariabilitySouth American ClimatePrecipitationRivershttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1This paper quantifies the relationship between sea ice cover (SIC) on the Southern Ocean precipitation and river discharges over southeastern and eastern South America. The period of analysis covers from 1981 to 2008 and includes monthly mean data of SIC over the Ross, Amundsen-Bellingshausen and Weddell Seas, atmospheric variables and discharges of selected river in eastern South America. To isolate the effect of known modes of climate variability on SIC, the signals of El Nino-Southern Oscillation and the Southern Annual Mode are removed from all time series through regression analysis. Composites of precipitation differences over South America reveal a pattern of enhanced rainfall activity over the South Atlantic Convergence Zone (SACZ) in summer (JFM) when SIC is above average particularly over the Weddell Sea area, while winter (ASO) SIC anomalies show negative and significant correlations with rainfall over much of South America. Moisture fluxes patterns in summer reveal increased moisture transport towards the SACZ region and decreased low-level jet activity (and precipitation) over northern Argentina. In particular a large dry bias over southeastern South America associated to positive SIC anomalies on the Weddell Sea in September is shown to impact the discharges of the Uruguay and Iguazu Rivers, with the largest effects found two months after the SIC anomaly (November). Although less robust, a relationship with the Parana River is also found. These results suggest that increased SIC over the Weddell Sea during September can help to forecast drier conditions particularly on the Uruguay basin and somewhat wetter conditions in the SACZ region within the following season.Fil: Saurral, Ramiro Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera; ArgentinaFil: Camilloni, Ines Angela. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera; ArgentinaFil: Barros, Vicente Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera; ArgentinaWiley2014-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/4510Saurral, Ramiro Ignacio; Camilloni, Ines Angela; Barros, Vicente Ricardo; Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South America; Wiley; International Journal of Climatology; 34; 7; 6-2014; 2362-23770899-8418enginfo:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1002/joc.3844/abstractinfo:eu-repo/semantics/altIdentifier/doi/DOI:10.1002/joc.3844info:eu-repo/semantics/altIdentifier/issn/0899-8418info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T15:02:18Zoai:ri.conicet.gov.ar:11336/4510instacron: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:34982025-10-15 15:02:18.701CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South America
title Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South America
spellingShingle Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South America
Saurral, Ramiro Ignacio
Sea-Ice Variability
South American Climate
Precipitation
Rivers
title_short Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South America
title_full Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South America
title_fullStr Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South America
title_full_unstemmed Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South America
title_sort Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South America
dc.creator.none.fl_str_mv Saurral, Ramiro Ignacio
Camilloni, Ines Angela
Barros, Vicente Ricardo
author Saurral, Ramiro Ignacio
author_facet Saurral, Ramiro Ignacio
Camilloni, Ines Angela
Barros, Vicente Ricardo
author_role author
author2 Camilloni, Ines Angela
Barros, Vicente Ricardo
author2_role author
author
dc.subject.none.fl_str_mv Sea-Ice Variability
South American Climate
Precipitation
Rivers
topic Sea-Ice Variability
South American Climate
Precipitation
Rivers
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv This paper quantifies the relationship between sea ice cover (SIC) on the Southern Ocean precipitation and river discharges over southeastern and eastern South America. The period of analysis covers from 1981 to 2008 and includes monthly mean data of SIC over the Ross, Amundsen-Bellingshausen and Weddell Seas, atmospheric variables and discharges of selected river in eastern South America. To isolate the effect of known modes of climate variability on SIC, the signals of El Nino-Southern Oscillation and the Southern Annual Mode are removed from all time series through regression analysis. Composites of precipitation differences over South America reveal a pattern of enhanced rainfall activity over the South Atlantic Convergence Zone (SACZ) in summer (JFM) when SIC is above average particularly over the Weddell Sea area, while winter (ASO) SIC anomalies show negative and significant correlations with rainfall over much of South America. Moisture fluxes patterns in summer reveal increased moisture transport towards the SACZ region and decreased low-level jet activity (and precipitation) over northern Argentina. In particular a large dry bias over southeastern South America associated to positive SIC anomalies on the Weddell Sea in September is shown to impact the discharges of the Uruguay and Iguazu Rivers, with the largest effects found two months after the SIC anomaly (November). Although less robust, a relationship with the Parana River is also found. These results suggest that increased SIC over the Weddell Sea during September can help to forecast drier conditions particularly on the Uruguay basin and somewhat wetter conditions in the SACZ region within the following season.
Fil: Saurral, Ramiro Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera; Argentina
Fil: Camilloni, Ines Angela. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera; Argentina
Fil: Barros, Vicente Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera; Argentina
description This paper quantifies the relationship between sea ice cover (SIC) on the Southern Ocean precipitation and river discharges over southeastern and eastern South America. The period of analysis covers from 1981 to 2008 and includes monthly mean data of SIC over the Ross, Amundsen-Bellingshausen and Weddell Seas, atmospheric variables and discharges of selected river in eastern South America. To isolate the effect of known modes of climate variability on SIC, the signals of El Nino-Southern Oscillation and the Southern Annual Mode are removed from all time series through regression analysis. Composites of precipitation differences over South America reveal a pattern of enhanced rainfall activity over the South Atlantic Convergence Zone (SACZ) in summer (JFM) when SIC is above average particularly over the Weddell Sea area, while winter (ASO) SIC anomalies show negative and significant correlations with rainfall over much of South America. Moisture fluxes patterns in summer reveal increased moisture transport towards the SACZ region and decreased low-level jet activity (and precipitation) over northern Argentina. In particular a large dry bias over southeastern South America associated to positive SIC anomalies on the Weddell Sea in September is shown to impact the discharges of the Uruguay and Iguazu Rivers, with the largest effects found two months after the SIC anomaly (November). Although less robust, a relationship with the Parana River is also found. These results suggest that increased SIC over the Weddell Sea during September can help to forecast drier conditions particularly on the Uruguay basin and somewhat wetter conditions in the SACZ region within the following season.
publishDate 2014
dc.date.none.fl_str_mv 2014-06
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/11336/4510
Saurral, Ramiro Ignacio; Camilloni, Ines Angela; Barros, Vicente Ricardo; Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South America; Wiley; International Journal of Climatology; 34; 7; 6-2014; 2362-2377
0899-8418
url http://hdl.handle.net/11336/4510
identifier_str_mv Saurral, Ramiro Ignacio; Camilloni, Ines Angela; Barros, Vicente Ricardo; Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South America; Wiley; International Journal of Climatology; 34; 7; 6-2014; 2362-2377
0899-8418
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1002/joc.3844/abstract
info:eu-repo/semantics/altIdentifier/doi/DOI:10.1002/joc.3844
info:eu-repo/semantics/altIdentifier/issn/0899-8418
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
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Wiley
publisher.none.fl_str_mv Wiley
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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score 13.22299

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