PNAS cover issue August 2019

Rainfall variations in central Indo-Pacific over the past 2,700 y

Liangcheng Tan, Chuan-Chou Shen, Ludvig Löwemark, Sakonvan Chawchai, R. Lawrence Edwards, Yanjun Cai, Sebastian F. M. Breitenbach, Hai Cheng, Yu-Chen Chou, Helmut Duerrast, Judson W. Partin, Wenju Cai, Akkaneewut Chabangborn, Yongli Gao, Ola Kwiecien, Chung-Che Wu, Zhengguo Shi, Huang-Hsiung Hsu, and Barbara Wohlfarth

We present a high-resolution, replicated speleothem δ18O record from Klang Cave in southern Thailand that characterizes rainfall variation in NCIP over the past 2,700 y. This record reveals notable dry climate conditions during the current and past warm periods, similar to the observations in SCIP, which resemble enhanced El Niño-like conditions. Using a newly developed ITCZ shift index, we find a southward shifted ITCZ during the early MWP and the CWP. Our results suggest that detecting changes in rainfall due to anthropogenic forcing still remains indistinguishable from natural variability in the northern tropics.

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