OBSERVATIONAL EVIDENCE FOR FUKUSHIMA RADIONUCLIDE SIGNALS IN THE NORTH PACIFIC TWO YEARS AFTER THE RELEASE
Contaminated waters from the Fukushima nuclear power plant were discharged directly into the North Pacific Ocean in March 2011. Although the coastal current system in this region and the time scale of water exchange with the open ocean is not well understood, both observational evidence and numerical model simulations indicate relatively rapid advection of contaminants eastward into the highly energetic mixed water region in the confluence of the Kuroshio and Oyashio currents. In this investigation, we use radionuclides of Fukushima origin as a tracer to understand the North Pacific circulation and mixing process 2 years after the release. Depth profiles from the March-May 2013 30N Climate Variability and Predictability and Carbon (CLIVAR) repeat transect and recently collected coastal cruise hydrography data are examined to track the radionuclide penetration into the subsurface ocean and the subduction pathways along isopycnal surfaces.
Yoshida, S., Woods Hole Oceanographic Institution, USA, firstname.lastname@example.org
Jayne, S. R., Woods Hole Oceanographic Institution, USA, email@example.com
Macdonald, A. M., Woods Hole Oceanographic Institution, USA, firstname.lastname@example.org
Buesseler, K., Woods Hole Oceanographic Institution, USA, email@example.com
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