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       17-Jul-2014
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INTERANNUAL AND INTERDECADAL LINKS VARIATIONS IN THE STREAMFLOW OF SOUTH AMERICAN RIVERS AND THEIR LINKS TO CLIMATE

Alvaro Diaz(1) and C. Roberto Mechoso(2)

(1) Institute of Fluid Mechanics and Environmental Engineering, Julio Herrera y Reissig 565, Montevideo, Uruguay

(2) Department of Atmospheric and Oceanic Sciences, University of California Los Angeles, USA

Abstract

Interannual and interdecadal variations in annual-mean streamflow for eight major rivers in South America during most of the 20th century are examined. A singular spectrum analysis method (SSA) is applied to extract contributions to the variance in the periods 2-3 years, 3-5 years, and 6-13 years. The reconstructed time series are correlated with indices representative of known global climate variations. It is shown that, while almost all of the rivers in this study show increasing trends during the 20th century, their reconstructed time series for the three selected bands present different behaviors.

 

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