Yanjun Cai¹, Zhisheng An², Wenwen Kong³, Hai Cheng⁴, R. Lawrence Edwards⁵, Inez Y Fung⁶, Liangcheng Tan¹, Haiwei Zhang⁴ and Hua Bi⁷, (1)IEE Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China, (2)State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China, (3)University of California Berkeley, Department of Geography, Berkeley, CA, United States, (4)Xi'an Jiaotong University, Institute of Global Environmental Change, Xi'an, China, (5)University of Minnesota Twin Cities, Dept. of Earth Sciences, Minneapolis, MN, United States, (6)UC Berkeley, Berkeley, CA, United States, (7)Hainan Normal University, College of Geography and Environmental Science, Haikou, China