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Interannual variability in the Uruguay river basin
Author(s) -
Krepper C. M.,
García N. O.,
Jones P. D.
Publication year - 2003
Publication title -
international journal of climatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.58
H-Index - 166
eISSN - 1097-0088
pISSN - 0899-8418
DOI - 10.1002/joc.853
Subject(s) - precipitation , structural basin , climatology , drainage basin , streamflow , singular spectrum analysis , environmental science , el niño southern oscillation , scale (ratio) , hydrology (agriculture) , flow (mathematics) , geology , geography , meteorology , geomorphology , geometry , cartography , geotechnical engineering , mathematics , artificial intelligence , singular value decomposition , computer science
Both (El Niño–southern oscillation ENSO)‐scale and near‐decadal variations in precipitation and river flow have been noted in southeastern South America. Here we focus on the Uruguay river basin and its subcatchments. Both river flow and precipitation are analysed with singular spectrum analysis in an examination of how the signals of the subcatchments are related to the overall basin signal. The approximate 6 year signal and the 3.5 year ENSO signal are the two statistically significant peaks for the river flow. Both signals are present in all the available river flows, but only in the precipitation of the upper two‐thirds of the basin. Precipitation in the lower part of the basin shows positive trends. The ENSO signal is strongly modulated at the secular time scale; we construct a simple sinusoidal model for this modulation. Copyright © 2003 Royal Meteorological Society.