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Abstract:

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.

Registro:

Documento: Artículo
Título:Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South America
Autor:Saurral, R.; Barros, V.; Camilloni, I.
Filiación:Centro de Investigaciones del Mar y la Atmósfera (CIMA/CONICET-UBA), UMI IFAECI/CNRS and Departamento de Ciencias de la Atmósfera y los Océanos (FCEN-UBA), Buenos Aires, Argentina
Palabras clave: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
Año:2014
Volumen:34
Número:7
Página de inicio:2362
Página de fin:2377
DOI: http://dx.doi.org/10.1002/joc.3844
Título revista:International Journal of Climatology
Título revista abreviado:Int. J. Climatol.
ISSN:08998418
CODEN:IJCLE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v34_n7_p2362_Saurral

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Citas:

---------- APA ----------
Saurral, R., Barros, V. & Camilloni, I. (2014) . Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South America. International Journal of Climatology, 34(7), 2362-2377.
http://dx.doi.org/10.1002/joc.3844
---------- CHICAGO ----------
Saurral, R., Barros, V., Camilloni, I. "Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South America" . International Journal of Climatology 34, no. 7 (2014) : 2362-2377.
http://dx.doi.org/10.1002/joc.3844
---------- MLA ----------
Saurral, R., Barros, V., Camilloni, I. "Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South America" . International Journal of Climatology, vol. 34, no. 7, 2014, pp. 2362-2377.
http://dx.doi.org/10.1002/joc.3844
---------- VANCOUVER ----------
Saurral, R., Barros, V., Camilloni, I. Sea ice concentration variability over the Southern Ocean and its impact on precipitation in southeastern South America. Int. J. Climatol. 2014;34(7):2362-2377.
http://dx.doi.org/10.1002/joc.3844