Transitions of redox state and nutrient status in the Southern Ocean since the last glacial: Evidence from speciation analyses of C, Fe, and P in sediments at the Conrad Rise

Naoyuki Shimode, Toho University, Chiba, Japan, Kosei E Yamaguchi, NASA Astrobiology Institute, ., United States and Minoru Ikehara, Kochi University, Center for Advanced Marine Core Research, Nankoku, Japan