In this study, we develop the first tree-ring based precipitation reconstruction for the northern South American Altiplano back to 1625 CE. We established the significance of our reconstruction by using it to determine that the occurrence rate of extreme dry events together with a shift in mean dry conditions for the late 20th-beginning 21st century is unprecedented in the past 389 years. Our reconstruction provides also valuable information about the ENSO influences in the local precipitation.

Archivo assets_1_crnreglags_PCs.xls: Polylepis tarapacana composite tree-ring chronology and the first three principal components used as predictors in the reconstruction model Archivo assets_2_Rec_instr_precipitation_L5O.xls: Instrumental and reconstructed precipitation for the northern South American Altiplano.