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Abstract:

The greatest discharges of the Paraguay River were studied using monthly series of Ladario, Brazil, at the outlet of the vast wetland of the Pantanal, and Asunción, Paraguay, at the middle Paraguay River outlet. Most of the major discharges at Asunción peaked between May and July, in phase with the annual maximum of the river discharges. They originated in the upper and middle Paraguay basins and were independent of the Pantanal output because their climate forcings were different from those of the Pantanal. In fact, most of the major discharge contributions from the upper and middle Paraguay basins occurred during El Niño (EN) periods, while at the Pantanal outlet they happened in neutral periods. The top discharge occurred during the autumn following the EN onset year. The composite of these cases has a tropospheric circulation that enhances the subtropical jet and the cyclonic vorticity advection over the Alto Paraná and the upper and middle Paraguay basins, favoring large positive anomalies in the precipitation field. Not all the major discharges were related to EN. Particularly, the major discharges that peaked in winter shared common features, despite their occurrence during EN, La Ninña, or the neutral phases. Their April to August fields had an almost barotropic pattern at high latitudes with a deep cyclonic anomaly between 120° and 160°W and an anticyclonic anomaly over the southern tip of South America. This pattern is consistent with a northward shift of the synoptic perturbation tracks, which favors fields of positive precipitation anomalies over the Paraguay basin. © 2004 American Meteorological Society.

Registro:

Documento: Artículo
Título:The major discharge events in the Paraguay River: Magnitudes, source regions, and climate forcings
Autor:Barros, V.; Chamorro, L.; Coronel, G.; Baez, J.
Filiación:Dept. of Atmospheric/Oceanic Sci., University of Buenos Aires, CONICET, Pab. 2.P. 2, 1428 Buenos Aires, Argentina
Department of Physics, University of Asunción, San Lorenzo, Paraguay
Meteorological Service of Paraguay, Asunción, Paraguay
Palabras clave:atmospheric circulation; climate forcing; El Nino; hydrometeorology; peak discharge; precipitation (climatology); river basin; river discharge; Paraguay River; South America; Western Hemisphere; World
Año:2004
Volumen:5
Número:6
Página de inicio:1161
Página de fin:1170
DOI: http://dx.doi.org/10.1175/JHM-378.1
Título revista:Journal of Hydrometeorology
Título revista abreviado:J. Hydrometeorol.
ISSN:1525755X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1525755X_v5_n6_p1161_Barros

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Citas:

---------- APA ----------
Barros, V., Chamorro, L., Coronel, G. & Baez, J. (2004) . The major discharge events in the Paraguay River: Magnitudes, source regions, and climate forcings. Journal of Hydrometeorology, 5(6), 1161-1170.
http://dx.doi.org/10.1175/JHM-378.1
---------- CHICAGO ----------
Barros, V., Chamorro, L., Coronel, G., Baez, J. "The major discharge events in the Paraguay River: Magnitudes, source regions, and climate forcings" . Journal of Hydrometeorology 5, no. 6 (2004) : 1161-1170.
http://dx.doi.org/10.1175/JHM-378.1
---------- MLA ----------
Barros, V., Chamorro, L., Coronel, G., Baez, J. "The major discharge events in the Paraguay River: Magnitudes, source regions, and climate forcings" . Journal of Hydrometeorology, vol. 5, no. 6, 2004, pp. 1161-1170.
http://dx.doi.org/10.1175/JHM-378.1
---------- VANCOUVER ----------
Barros, V., Chamorro, L., Coronel, G., Baez, J. The major discharge events in the Paraguay River: Magnitudes, source regions, and climate forcings. J. Hydrometeorol. 2004;5(6):1161-1170.
http://dx.doi.org/10.1175/JHM-378.1