Jong-Yeon Park, Chonbuk National University, South Korea, Charles A Stock, NOAA/GFDL, Princeton, NJ, United States, John P Dunne, NOAA Geophys Fluid Dynamic, Princeton, United States, Xiaosong Yang, UCAR, Princeton, NJ, United States and Anthony John Rosati, Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States