Near-cycles in river streamflows
The Paran·, Paraguay, Uruguay, Negro River streamflow show significant near-cycles in ENSO-like and decadal time scales. There are also significant long-term trends.
What causes these variations?
The Uruguay and Negro appear to be affected by ENSO.
The Paraguay and Paran· appear to be affected by decadal variations in SST in the tropical North Atlantic Ocean.
Can these variations be used to obtain useful probabilistic predictions of monthly streamflow in those rivers?
What are the current most limiting factors to adequately address these questions?