Yingxue Liu, GEOMAR Helmholtz Centre for Ocean Research Kiel; Faculty of Mathematics and Natural Sciences, Christian Albrechts University of Kiel, Kiel, Germany, Joakim Kjellsson, Swedish Meteorological and Hydrological Institute, Norrköping, Sweden, Abhishek Savita, Centre for Atmospheric Sciences, Indian Institute of Technology Delhi, New Delhi, India, Hyacinth Nnamchi, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany and Wonsun Park, Pusan National University, Department of Climate System, Busan, South Korea