ENSO‐Mediated Linkage Between the East Asian Summer Monsoon and Cordilleran Ice Sheet Discharge During MIS 3

Understanding the mechanisms linking low‐latitude monsoon variability and high‐latitude ice‐sheet discharge is critical for elucidating past atmospheric teleconnections, yet direct evidence for such linkages during the last glacial period remains limited. Here we present a high‐resolution terrigenous input record from the South China Sea (SCS) core XB1 covering the past ∼50 ka, which reflects East Asian Summer Monsoon (EASM) variability. Abrupt increases in terrigenous input during Marine Isotope Stage (MIS) 3 coincide with CIS discharge events (Siku events). Integrated proxy evidence and climate model simulations indicate that El Niño‐Southern Oscillation (ENSO) likely mediated this linkage: under La Niña‐like conditions, intensified EASM precipitation enhanced runoff into the northern SCS, while a strengthened North Pacific Subtropical High (NPSH) facilitated poleward heat transport, promoting CIS melting. These results suggest that ENSO provided an important atmospheric pathway linking low‐ and high‐latitude climate variability during MIS 3.