1. School of History, Nanjing University, Nanjing 210023, China.
2. School of Atmospheric Sciences, Nanjing University, Nanjing 210023, China.
3. Collaborative Innovation Center for Climate Change, Nanjing 210023, China.
4. Institute of Oriental Architecture, Nanjing University, Nanjing 210023, China.
5. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Science, Beijing 100101, China.