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

Mostrar todas las versiones(2)

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...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Saurral, R., Barros, V., Camilloni, I.
Formato: INPR
Lenguaje:English
Materias:
Precipitation
Rivers
Sea ice variability
South American climate
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_08998418_v_n_p_Saurral
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_08998418_v_n_p_Saurral
record_format dspace
spelling todo:paper_08998418_v_n_p_Saurral2023-10-03T15:44:32Z Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South America Saurral, R. Barros, V. Camilloni, I. Precipitation Rivers Sea ice variability South American climate 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. INPR English info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_08998418_v_n_p_Saurral
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language English
orig_language_str_mv English
topic Precipitation
Rivers
Sea ice variability
South American climate
spellingShingle Precipitation
Rivers
Sea ice variability
South American climate
Saurral, R.
Barros, V.
Camilloni, I.
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.
format INPR
author Saurral, R.
Barros, V.
Camilloni, I.
author_facet Saurral, R.
Barros, V.
Camilloni, I.
author_sort Saurral, R.
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
url http://hdl.handle.net/20.500.12110/paper_08998418_v_n_p_Saurral
work_keys_str_mv AT saurralr seaiceconcentrationvariabilityoverthesouthernoceananditsimpactonprecipitationinsoutheasternsouthamerica
AT barrosv seaiceconcentrationvariabilityoverthesouthernoceananditsimpactonprecipitationinsoutheasternsouthamerica
AT camillonii seaiceconcentrationvariabilityoverthesouthernoceananditsimpactonprecipitationinsoutheasternsouthamerica
_version_ 1807321550540505088

Ejemplares similares