The tree-ring δ18O network over Northeast China captures regional climate variability: coherence, gradients, and site-dependent controls - Qiang Li; Jiachuan Wang; Yu Liu; Chenxi Xu; Takeshi Nakatsuka; Yifan Wu; Zichun Jia; Yang Xu; Changfeng Sun; Huiming Song; Qiufang Cai; Meng Ren; et al. (Palaeogeography, Palaeoclimatology, Palaeoecology, 2026)