Summer and nonsummer climatic signals in speleothem δ 18 O revealed by loess microcodium δ 18 O in East Asia - Zeke Zhang; Zhengyu Liu; Gaojun Li; Yanjun Cai; Qin Wen; Hai Cheng; R. Lawrence Edwards; Jing Lei; Heng Liu; Zhaowei Jing; Tao Li; Steven C. Clemens; et al. (Proceedings of the National Academy of Sciences, 2025)