End of Green Sahara amplified mid- to late Holocene megadroughts in mainland Southeast Asia.

The composite TM δ 18 O record, constructed by averaging the three speleothem isotope profiles for the periods of overlap, displays an increasing trend through much of the Holocene (Fig. 2a ), with values increasing by ≈2‰ between the early and late Holocene.

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While the higher resolution δ 13 C and Mg/Ca records show more structural features, the increasing trend in these proxies from ≈5 ka is matched by a decreasing trend in DCP approaching 4 ka, after which the trends are amplified until ≈3.7 ka.

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