1. Department of Meteorology, Stockholm University, Stockholm, Sweden;
2. Department of Physical Geography, Stockholm University, Stockholm, Sweden;
3. Bolin Center for Climate Research, Stockholm University, Stockholm, Sweden;
4. LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China;
5. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, China;
6. Department of Earth and Planetary Sciences, Kyushu University, Fukuoka, Japan