章节大纲

    •   Observation on the Arctic Ocean (Chukchi Sea shelf) with the JAMSTEC research vessel “Mirai”.

       

       Oceanographic observations were conducted in the Chukchi Sea, which is located in the Pacific sector of Arctic Sea, over the continental shelf with the JAMSTEC research vessel “Mirai” in September 2012. In our laboratory, seawater was vertically sampled (from the sea surface to just above the seafloor on the continental shelf) at the observation stations shown below, where we measured the concentrations of organic iodine gas (org-I) in seawater.















      Biogeosciences, 13, 133–145, 2016, www.biogeosciences.net/13/133/2016/doi:10.5194/bg-13-133-2016, © Author(s) 2016. CC Attribution 3.0 license


    •   The vertical profiles of the concentration of organic gas species from the continental shelf area  to the basin area (towards the North Pole). The vertical axis is the water depth, and the horizontal axis is the concentration of each component. Concentrations were low near the surface, but high concentrations could be seen at around depths of 50-100 m, close to the seafloor depth over the continental shelf.

      Therefore, we began to think, “are organic iodine gases being produced in marine sediment?”.