The Paraná River Response to El Niño 1982–83 and 1997–98 Events

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Abstract
The most severe flooding of the twentieth century in the Argentine section of the Paraná River occurred during the strong El Niño (EN) event of 1983. During the 1997–98 EN episode, discharge anomalies in the Paraná basin, although of the same sign as those of the 1982–83 event, were much smaller. The main differences were observed during January–March and June–July of the year following the starting date of the event, when the 1982–83 discharge anomalies were considerably larger. This study explores this issue as well as the relationship between convection anomalies in the Paraná basin and tropical Pacific and South Atlantic sea surface temperature (SST) anomalies. The correlation between convection in the upper and middle Paraná and Iguazú basins, as measured by outgoing longwave radiation, and SST in both the Niño-1+2 and Niño-3 regions is statistically significant for most of the period November–July, reaching the maximum value in the three basins during May. However, the analysis of the highe... Abstract The most severe flooding of the twentieth century in the Argentine section of the Paraná River occurred during the strong El Niño (EN) event of 1983. During the 1997–98 EN episode, discharge anomalies in the Paraná basin, although of the same sign as those of the 1982–83 event, were much smaller. The main differences were observed during January–March and June–July of the year following the starting date of the event, when the 1982–83 discharge anomalies were considerably larger. This study explores this issue as well as the relationship between convection anomalies in the Paraná basin and tropical Pacific and South Atlantic sea surface temperature (SST) anomalies. The correlation between convection in the upper and middle Paraná and Iguazú basins, as measured by outgoing longwave radiation, and SST in both the Niño-1+2 and Niño-3 regions is statistically significant for most of the period November–July, reaching the maximum value in the three basins during May. However, the analysis of the highe...

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