Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South America
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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ftunibueairesbd:paper:paper_08998418_v_n_p_Saurral 2023-05-15T18:17:48+02:00 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 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v_n_p_Saurral https://hdl.handle.net/20.500.12110/paper_08998418_v_n_p_Saurral unknown https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v_n_p_Saurral http://hdl.handle.net/20.500.12110/paper_08998418_v_n_p_Saurral Precipitation Rivers Sea ice variability South American climate 2013 ftunibueairesbd https://doi.org/20.500.12110/paper_08998418_v_n_p_Saurral 2023-02-16T02:13:48Z 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 ... Other/Unknown Material Sea ice Southern Ocean Weddell Sea Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) Argentina Southern Ocean Uruguay Weddell Weddell Sea |
institution |
Open Polar |
collection |
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
op_collection_id |
ftunibueairesbd |
language |
unknown |
topic |
Precipitation Rivers Sea ice variability South American climate |
spellingShingle |
Precipitation Rivers Sea ice variability South American climate 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 |
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. 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 ... |
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 |
2013 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v_n_p_Saurral https://hdl.handle.net/20.500.12110/paper_08998418_v_n_p_Saurral |
geographic |
Argentina Southern Ocean Uruguay Weddell Weddell Sea |
geographic_facet |
Argentina Southern Ocean Uruguay Weddell Weddell Sea |
genre |
Sea ice Southern Ocean Weddell Sea |
genre_facet |
Sea ice Southern Ocean Weddell Sea |
op_relation |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v_n_p_Saurral http://hdl.handle.net/20.500.12110/paper_08998418_v_n_p_Saurral |
op_doi |
https://doi.org/20.500.12110/paper_08998418_v_n_p_Saurral |
_version_ |
1766193106915426304 |