Variabilité pluviométrique en Bolivie lors des phases extrêmes de l’Oscillation Australe du Pacifique (1950-1993)

Rainfall variability based on extreme phases of the southern oscillation in Bolivia (1950-1993) Rainfall variability in the Andes and in the lowlands of Bolivia is great during the two phases of the Pacific Southern Oscillation (SO). We show that very strong or weak seasonal rainfalls are independant of the SO Index, except in a few cases. In the Andes, negative rainfall anomalies occur during seven ENSO events above 8 (with a mean of -30%). In the lowlands, the only significant space-time consistent negative anomalies occur after 1970, during LNSO phases, in some southerly and central stations.