Jiao Chen^1,2, Xuezhu Wang³, Qiang Wang², Xinyue Li², Vasco Mueller², Sergey Danilov², Xidong Wang¹ and Thomas Jung^2,4, (1)Hohai University, College of Oceanography, Nanjing, China, (2)Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany, (3)Donghai Laboratory, Nanjing, China, (4)University of Bremen, Institute of Environmental Physics, Bremen, Germany