1. Cold and Arid Regions Environmental and Engineering Research Institute (CAREERI); Chinese Academy of Sciences (CAS); Gansu province Lanzhou China
2. National Snow and Ice Data Center (NSIDC), Cooperative Institute for Research in Environmental Science (CIRES); University of Colorado; Boulder CO USA
3. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute; Chinese Academy of Sciences; Lanzhou China