Study on the change of global air freezing/thawing index based on observations
Cong CHEN, Xiaoqing PENG, Xuanjia LI, Weiwei TIAN, Guangshang YANG
Journal of Glaciology and Geocryology . 2023, (2): 509 -520 .  DOI: 10.7522/j.issn.1000-0240.2023.0039