Fig. S3.

The δ¹⁸O sea-level correction for Lianhua and Dongge and correlation with Lake Dali. (A) Lianhua δ¹⁸O record corrected for composition of the ocean. The correction was made using a 100-y interpolation of the cave data (18) and subtracting the change of the isotopic composition of sea water using a 100-y interpolation of sea-level (41) and a 1‰ difference glacial to interglacial (42) (gray line, 5 point smooth black line). The cave δ¹⁸O data are presented in VPDB scale (18), whereas the isotopic value of seawater is presented in VSMOW scale (42). The difference is 3% and is temperature sensitive (43); as cave temperature is unknown and the correction is small, we neglect this correction. The correlation is based only on radiocarbon samples that we view as most indicative of Lake Dali lake level (red diamonds). Three points were omitted from the correlation (open diamonds). (B) Correlation between Lake Dali lake level and Lianhua Cave δ¹⁸O. Note that three points from the B–A were omitted from this correlation (open diamonds). (C) Same as A for Dongge cave, omitting two points. (D) Same as B for Dongge cave, omitting two points (open diamonds).