Jing Wang, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China, Janet Sprintall, Univ California San Diego, La Jolla, United States, Haoyu Wang, Institute of Oceanography, Chinese Academy of Sciences, Qingdao, China, X. Li, CAS Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences and Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, China and Janet Sprintall