Speleothem multi-proxy inferred hydroclimate variability during the 2.8 ka event and its influence on human activities in southeastern China - Xiaomei Zhang; Haiwei Zhang; Ashish Sinha; Miaomiao Wang; Jian Wang; Yueer Li; Liangkang Pan; Rui Zhang; Youfeng Ning; Xuexue Jia; Baoyun Zong; Hai Cheng (Global and Planetary Change, 2026)