1. Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research; Chinese Academy of Sciences; Beijing 100101 China
2. Key Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research; Chinese Academy of Sciences; Beijing 100101 China
3. CAS Center for Excellence in Tibetan Plateau Earth Sciences; Beijing 100101 China
4. Department of Geography; National University of Singapore, Arts Link 1; Singapore 117570
5. State Key Laboratory of Hydro-Science and Engineering; Tsinghua University; Beijing 100084 China
6. The flood control and drought relief headquarters office of Tibet Autonomous Region; Lhasa Tibet 850000 China