*Liwei Jia^1,2, Xiaosong Yang^1,2, Gabriel Vecchi³, Richard Gudgel, Thomas Delworth¹, Stephan Fueglistaler³, Pu Lin³, Adam Scaife⁴, Seth Underwood¹, Shian-Jiann Lin (1.NOAA Geophysical Fluid Dynamics Laboratory, 2.University Corporation for Atmospheric Research, 3.Princeton University, 4.Met Office Hadley Centre)