Fan Jia¹, Wenju Cai², Lixin Wu³, Bolan Gan³, Guojian Wang², Fred Kucharski⁴, Ping Chang⁵ and Noel S Keenlyside⁶, (1)Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China, (2)Centre for Southern Hemisphere Oceans Research (CSHOR), CSIRO Oceans and Atmosphere, Hobart, Australia, (3)Ocean University of China, Qingdao, China, (4)Abdus Salam International Center for Theoretical Physics, Earth Physics Section, Trieste, Italy, (5)Texas A & M Univ, College Station, TX, United States, (6)Geophysical Institute, Juneau, Norway