1. Joint International Research Laboratory of Climate and Environment Change, Nanjing Univ. of Information Science and Technology, Nanjing 210044, China (corresponding author).
2. Professor, College of Applied Meteorology, Nanjing Univ. of Information Science and Technology, No. 219, Ningliu St., Nanjing, Jiangsu 210044, PR China.
3. Graduate Student, College of Applied Meteorology, Nanjing Univ. of Information Science and Technology, No. 219, Ningliu St., Nanjing, Jiangsu 210044, PR China.