WHOI has recently released the results of a three-year study of sediment samples collected offshore in the American Chemical Society’s journal, Environmental Science and Technology.
The purpose of the study is to understand what happens to the Fukushima contaminants after they are buried on the seafloor off of coastal Japan.
The team, led by senior scientist and marine chemist Ken Buesseler, found that a small fraction of contaminated sea floor sediments off Fukushima are moved offshore by typhoons that resuspend radioactive particles in the water, which then travel laterally with Southeasterly currents into the Pacific Ocean.
Researchers used funnel-shaped traps to collect the data at depths of 500 meters and 1,000 meters starting 130 days after the disaster.
The research found radiocesium from the plant along with sediment with a high fraction of clay material in the samples. The clay material is characteristic of shelf and slope sediments and suggest a near shore source.
Buesseler says that more than 99 percent of the contaminated material from the plant moved with the water offshore and that less than 1 percent ended up on the sea floor as buried sediment.