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

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This article quantifies the relationship between sea ice cover (SIC) on the Southern Ocean and 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...

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Autores principales: Saurral, Ramiro Ignacio, Barros, Vicente Ricardo, Camilloni, Ines Angela
Publicado: 2014
Materias:
Precipitation
Rivers
Sea ice variability
South American climate
Atmospheric pressure
Moisture
Precipitation (chemical)
Rain
Regression analysis
Sea ice
Atmospheric variables
Climate variability
Moisture transport
River discharge
Sea ice concentration
South atlantic convergence zones
Southeastern South America
moisture flux
precipitation (climatology)
rainfall
regional climate
river discharge
sea ice
Amundsen Sea
Bellingshausen Sea
Brazil
Iguacu River
Parana River
Ross Sea
Southern Ocean
Uruguay River
Weddell Sea
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v34_n7_p2362_Saurral
http://hdl.handle.net/20.500.12110/paper_08998418_v34_n7_p2362_Saurral
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_08998418_v34_n7_p2362_Saurral
record_format dspace
spelling paper:paper_08998418_v34_n7_p2362_Saurral2023-06-08T15:49:44Z Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South America Saurral, Ramiro Ignacio Barros, Vicente Ricardo Camilloni, Ines Angela Precipitation Rivers Sea ice variability South American climate Atmospheric pressure Moisture Precipitation (chemical) Rain Regression analysis Sea ice Atmospheric variables Climate variability Moisture transport River discharge Sea ice concentration South American climate South atlantic convergence zones Southeastern South America Rivers moisture flux precipitation (climatology) rainfall regional climate river discharge sea ice Amundsen Sea Bellingshausen Sea Brazil Iguacu River Parana River Ross Sea Southern Ocean Uruguay River Weddell Sea This article quantifies the relationship between sea ice cover (SIC) on the Southern Ocean and 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, as well as atmospheric variables and discharges of selected rivers in eastern South America. To isolate the effect of known modes of climate variability on SIC, the signals of El Niño-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 Iguazú Rivers, with the largest effects found two months after the SIC anomaly (November). Although less robust, a relationship with the Paraná 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. © 2013 Royal Meteorological Society. Fil:Saurral, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Barros, V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Camilloni, I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v34_n7_p2362_Saurral http://hdl.handle.net/20.500.12110/paper_08998418_v34_n7_p2362_Saurral
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Precipitation
Rivers
Sea ice variability
South American climate
Atmospheric pressure
Moisture
Precipitation (chemical)
Rain
Regression analysis
Sea ice
Atmospheric variables
Climate variability
Moisture transport
River discharge
Sea ice concentration
South American climate
South atlantic convergence zones
Southeastern South America
Rivers
moisture flux
precipitation (climatology)
rainfall
regional climate
river discharge
sea ice
Amundsen Sea
Bellingshausen Sea
Brazil
Iguacu River
Parana River
Ross Sea
Southern Ocean
Uruguay River
Weddell Sea
spellingShingle Precipitation
Rivers
Sea ice variability
South American climate
Atmospheric pressure
Moisture
Precipitation (chemical)
Rain
Regression analysis
Sea ice
Atmospheric variables
Climate variability
Moisture transport
River discharge
Sea ice concentration
South American climate
South atlantic convergence zones
Southeastern South America
Rivers
moisture flux
precipitation (climatology)
rainfall
regional climate
river discharge
sea ice
Amundsen Sea
Bellingshausen Sea
Brazil
Iguacu River
Parana River
Ross Sea
Southern Ocean
Uruguay River
Weddell Sea
Saurral, Ramiro Ignacio
Barros, Vicente Ricardo
Camilloni, Ines Angela
Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South America
topic_facet Precipitation
Rivers
Sea ice variability
South American climate
Atmospheric pressure
Moisture
Precipitation (chemical)
Rain
Regression analysis
Sea ice
Atmospheric variables
Climate variability
Moisture transport
River discharge
Sea ice concentration
South American climate
South atlantic convergence zones
Southeastern South America
Rivers
moisture flux
precipitation (climatology)
rainfall
regional climate
river discharge
sea ice
Amundsen Sea
Bellingshausen Sea
Brazil
Iguacu River
Parana River
Ross Sea
Southern Ocean
Uruguay River
Weddell Sea
description This article quantifies the relationship between sea ice cover (SIC) on the Southern Ocean and 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, as well as atmospheric variables and discharges of selected rivers in eastern South America. To isolate the effect of known modes of climate variability on SIC, the signals of El Niño-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 Iguazú Rivers, with the largest effects found two months after the SIC anomaly (November). Although less robust, a relationship with the Paraná 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. © 2013 Royal Meteorological Society.
author Saurral, Ramiro Ignacio
Barros, Vicente Ricardo
Camilloni, Ines Angela
author_facet Saurral, Ramiro Ignacio
Barros, Vicente Ricardo
Camilloni, Ines Angela
author_sort Saurral, Ramiro Ignacio
title Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South America
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
publishDate 2014
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v34_n7_p2362_Saurral
http://hdl.handle.net/20.500.12110/paper_08998418_v34_n7_p2362_Saurral
work_keys_str_mv AT saurralramiroignacio seaiceconcentrationvariabilityoverthesouthernoceananditsimpactonprecipitationinsoutheasternsouthamerica
AT barrosvicentericardo seaiceconcentrationvariabilityoverthesouthernoceananditsimpactonprecipitationinsoutheasternsouthamerica
AT camilloniinesangela seaiceconcentrationvariabilityoverthesouthernoceananditsimpactonprecipitationinsoutheasternsouthamerica
_version_ 1768542895056355328

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