Stable oxygen isotopic datasets for stalagmites JJ3 and JJ4

Data for: "Links between Internal Climate Variability and Glacial Termination" submitted to Geophysical Research Letters (Paper # 2025GL115815). These stalagmite isotopic records cover glacial terminations (T) II and III, and display comparable structure of Asian summer monsoon (ASM) variability on millennial timescale. When compared with TI cave records, similar centennial-scale ASM changes can be found between TI and TIII. Thus, it suggests that internal feedbacks could play an important role in driving glacial terminations.