Fig. 3: Correlation between Greenland ice-core δ¹⁸O/[Ca²⁺] records and the Cherrapunji δ¹⁸O record.

a Greenland ice-core δ¹⁸O records: NGRIP, GISP2, GRIP, and NEEM records (Supplementary Note 1.5). b Greenland ice-core [Ca²⁺] records (note the inverted logarithmic [Ca²⁺] y-axis, as same as in ref. 2): NGRIP, GISP2, GRIP, and NEEM records (Supplementary Note 1.5). c Cherrapunji speleothem δ¹⁸O record (this study). Greenland ice-core records are shown on the GICC05 chronology (Supplementary Note 1.5), which is shifted by +320 years via tuning the Greenland [Ca²⁺] time-series to the Cherrapunji δ¹⁸O record (see main text). Vertical red dashed lines depict the tie points between the ice-core and speleothem records (Supplementary Table 3). The leftmost two dashed lines correspond to Greenland Interstadial (GI)-2.1 and GI-2.2 peaks in Greenland² and their counterparts in the Asian summer monsoon regime (Dansgaard/Oeschger (DO)-2.1 and DO-2.2 peaks). Vertical gray bars depict the Greenland Stadial (GS)-3 dust peaks⁹⁴. Error bars show uncertainty (2σ) of the ²³⁰Th chronology of the Cherrapunji record (green) in comparison to the possible age bias of the GICC05 timescale².