セクションアウトライン

    •   　During the JAMSTEC “Mirai” voyage in 2012, we speculated that the marine sediments may be the cause of the generation of organic iodine gas species. Hence, we continued making observations at Funka Bay in Hokkaido during the voyages of the training ships from the Hokkaido University School of Fisheries Sciences in order to confirm these hypotheses (sites in the figure below).










    • I am the principal author of J Atmos Chem, Shimizu et al, DOI 10.1007/s10874-016-9352-6　 (Ooki), so I will reuse the figure as the copyright holder.

    •   The seasonal changes in the vertical distribution of iodoethane (left in the bottom figure) and phosphate (right in the bottom figure) in Funka Bay, Hokkaido (seabed depth of 96 m) are shown. A diatom bloom is observed in spring (March) in Funka Bay, but afterward, we observed a sudden increase in iodoethane near the seabed in May-June.




      　













      As we thought, the area around the seabed is suspicious! We were hesitant since we have not conducted observations where we collected seabed sediments to date, but we decided that we must directly investigate the sediments.