1. State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, No. 320, Donggang Western Road, Lanzhou, Gansu 730000, China
2. Antarctic Climate and Ecosystems, Cooperative Research Centre, Private Bag 80, Hobart, Tasmania 7001, Australia
3. Chinese Academy of Meteorological Sciences, No. 46, Zhongguancun South Street, Haidian District, Beijing 100081, China