Identifying key convection-sensitive oceanic regions to weaken the ENSO spring predictability barrier - Zepeng Mei; Shuheng Lin; Keyan Fang; Wanru Tang; Feifei Zhou; Fei Liu; Sen Zhao; Hao Wu; Jinbao Li; Zheng Zhao; Tinghai Ou; Xiaoxun Xie; et al. (Proceedings of the National Academy of Sciences, 2026)