*Yusuke Yokoyama¹, Anthony Purcell², Takeshige Ishiwa³ (1.Atmosphere and Ocean Research Institute, University of Tokyo, 2.Research School of Earth Sciences, The Australian National University, 3.National Institute of Polar Research)

*Naoto Fukuyo^1,2, Anthony Purcell³, Geoffrey Clark⁴, Phillip Parton⁴, Yusuke Yokoyama^1,2 (1.Atmosphere and Ocean Research Institute, The University of Tokyo, 2.Department of Earth and Planetary Sciences, Faculty of Science, The University of Tokyo, 3.Research School of Earth Sciences, The Australian National University, 4.College of Asia and the Pacific, Australian National University)