*Maria Luisa Tejada¹、Eun Young Lee²、Hans-Jurgen Brumsack³、Bernhard Schnetger³、Dennis Harry⁴、Seong Soo Chun²、Jun-Ichi Kimura¹ (1.Volcano and Earth Interior Research Center, Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology、2.Faculty of Earth System and Environmental Sciences, Chonnam National University, Gwangju, Republic of Korea、3.Institut für Chemie und Biologie des Meeres (ICBM), Carl von Ossietzky Universität Oldenburg, Oldenburg, Germany、4.Department of Geosciences, Colorado State University, Fort Collins, CO, USA)