INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
ENSO signals in South America: Rains and Floods in the Parana River Region during Colonial Times
PRIETO, MARIA DEL ROSARIO
Lugar: Dordrecht, The Netherlands; Año: 2007 p. 39 - 39
Abstract. Several studies show that the El Niño-Southern Oscillation (ENSO) is an important factor in determining interannual rainfall variability in South America. This signal is detected in the region including Northeastern Argentina, Uruguay and part of Southern of Brazil, provoking big floods in the regional rivers when the event persists until the autumn of the second year. To check that this relationship was similar in the past the objectives of this paper were to construct a time series of large floods and precipitations in the Paraná River region from documentary records, during 16th to 18th centuries, and to evaluate the relationship between the occurrence of ENSO events and the historical record of extreme floods. Considering that the period 1904-2000 where 11 out floods of 16 occurred during El Niño events, it can be concluded that the proportion of years with exceptional flow volume in the Paraná River and the years with El Niño events in the 17th and 18th centuries is lower than that of the 20th century.