1. Department of Earth and Planetary Science; The University of Tokyo; Tokyo Japan
2. Graduate School of Science; Kobe University; Kobe Japan
3. Graduate School of Human Development and Environment; Kobe University; Kobe Japan
4. Graduate School of Social and Cultural Studies; Kyushu University; Fukuoka Japan
5. Institute of Geology and Geoinformation; National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Japan
6. Diatom Minilab Akiba Ltd.; Saitama Japan
7. Department of Earth Sciences; Graduate School of Science; Chiba University; Chiba Japan
8. Graduate School of Human and Environmental Studies; Kyoto University; Kyoto Japan