Xingxing Liu, IEE Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China, Youbin Sun, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China, Jef Vandenberghe, Vrije Universiteit - Amsterdam, Department of Earth Sciences, Amsterdam, Netherlands, Xu Zhang, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI), Paleo-climate Dynamics, 27570 Bremerhaven, Germany, Gerrit Lohmann, Alfred Wegener Institute for P, Bremerhaven, Germany and Zhisheng An, State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China