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The Major Discharge Events In The Paraguay River: Magnitudes, Source Regions, And Climate Forcings

V. Barros, L. Chamorro, G. Coronel, J. Báez
Published 2004 · Geology

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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 Asuncion, Paraguay, at the middle Paraguay River outlet. Most of the major discharges at Asuncion 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 Nino (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 Parana and the upper and middle Paraguay basins, favoring large positive anomalies i...
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