1. School of Earth and Environmental Sciences, Seoul National University, 1 Gwanak-ro, Seoul, Republic of Korea
2. Division of Polar Earth System Sciences, Korea Polar Research Institute (KOPRI), 26 Songdomirae-ro, Incheon, Republic of Korea
3. Department of Earth and Environmental Science, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM, USA