Wenfeng Lai, The Hong Kong University of Science and Technology, Department of Mathematics, Hong Kong, Hong Kong, Jianping Gan, The Hong Kong University of Science and Technology, Department of Mathematics and Department of Ocean Science, Hong Kong, Hong Kong, Ye Liu, Swedish Meteorological and Hydrological Institute, Sweden, Zhiqiang LIU, Southern University of Science and Technology, Department of Ocean Science and Engineering, Shenzhen, China and Jiang Zhu, Institute of Atmospheric Physics, Beijing, China