Increased extreme warming events and the differences in the observed hydrothermal responses of the active layer to these events in China’s permafrost regions

Xiaofan Zhu, Tonghua Wu, Jie Ni, Xiaodong Wu, Guojie Hu, Shengjie Wang, Xiangfei Li, Amin Wen, Ren Li, Chengpeng Shang, Xin Ma