Brief communication: Identification of 140 000-year-old blue ice in the Grove Mountains, East Antarctica, by krypton-81 dating. - Hu, Zhengyi; Jiang, Wei; Yan, Yuzhen; Huang, Yan; Tang, Xueyuan; Li, Lin; Ritterbusch, Florian; Yang, Guo-Min; Lu, Zheng-Tian; Shi, Guitao (Cryosphere, 2024)