Shuai Yan^1,2, Donald D Blankenship³, Jamin Stevens Greenbaum³, Jingxue Guo⁴, Lin Li⁴, Duncan A Young³, Jason L Roberts⁵, Tas D van Ommen⁶ and Sun Bo⁴, (1)University of Texas at Austin, Institute for Geophysics, Austin, TX, United States, (2)University of Texas at Austin, Jackson School of Geosciences, Department of Geological Sciences, Austin, TX, United States, (3)University of Texas, Institute for Geophysics, Austin, TX, United States, (4)Polar Research Institute of China, Shanghai, China, (5)Australian Antarctic Division, Kingston, TAS, Australia, (6)Australian Antarctic Division, Kingston, Australia