Open AccessSpectral characteristics and ENSO relationship of the Paraná river streamflow
Author(s) -
R. P. Kane
Publication year - 2005
Publication title -
mausam
Language(s) - English
Resource type - Journals
ISSN - 0252-9416
DOI - 10.54302/mausam.v56i2.939
Subject(s) - el niño southern oscillation , streamflow , stream flow , climatology , environmental science , spectral analysis , discharge , flow (mathematics) , parana river , geology , hydrology (agriculture) , geography , drainage basin , physics , floodplain , cartography , geotechnical engineering , quantum mechanics , spectroscopy , mechanics
A spectral analysis of the Paraná river stream flow for 1904-1999 for 3 seasons indicated a periodicity of ~8.5 years in all seasons, with extra periodicities at ~17, ~5, ~3.7 and ~2.8 (QBO) years in JFMA months, at ~29, ~13, ~4.7, ~3.7, ~2.4 and ~2.1(QBO) years in MAMJ months, and at ~27 and ~3.4 years (no QBO) in SOND months. El Niños were associated with positive anomalies (floods) of the stream flow, with lags of few months. Pacific SST anomalies were of the same peak magnitude in the giant El Niño events of 1982 and 1997, but the stream flow anomalies were much larger in 1983 as compared to 1997. The rise and fall of the stream flow anomalies was oscillatory with peak separation of ~5 months.