Abrupt warming events in Greenland ice cores (Dansgaard-Oeschger or DO events) are linked to changes in tropical circulation and South American summer monsoon (SASM) strength. This study uses a sediment record from Lake Junín (Peru) to investigate the impact of DO events on Andean precipitation and glacier mass balance. Results show that DO events caused near-complete glacier disappearance below 4700 m and significant reductions in Lake Junín's level, revealing the magnitude of hydroclimatic disruptions in the Amazon Basin due to weakened SASM during Arctic warming. The findings highlight the potential for future Arctic warming to significantly reduce precipitation-evaporation balance in the Andes.

Arielle Woods, Donald T. Rodbell, Mark B. Abbott, Robert G. Hatfield, Christine Y. Chen, Sophie B. Lehmann, David McGee, Nicholas C. Weidhaas, Pedro M. Tapia, Blas L. Valero-Garcés, Mark B. Bush, Joseph S. Stoner