1. Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity Institute of Earth Surface System and Hazards College of Urban and Environmental Sciences Northwest University Xi'an China
2. Department of Atmospheric and Oceanic Sciences School of Physics Peking University Beijing China
3. Atmospheric Sciences and Global Change Division Pacific Northwest National Laboratory Richland WA USA
4. Department of Meteorology and Atmospheric Science The Pennsylvania State University University Park PA USA