Charmasson Sabine

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  • Article
    Exploring new frontiers in marine radioisotope tracing - adapting to new opportunities and challenges
    (Frontiers Media, 2020-06-03) Cresswell, Tom ; Metian, Marc ; Fisher, Nicholas S. ; Charmasson, Sabine ; Hansman, Roberta L. ; Bam, Wokil ; Bock, Christian ; Swarzenski, Peter W.
    Radioisotopes have been used in earth and environmental sciences for over 150 years and provide unique tools to study environmental processes in great detail from a cellular level through to an oceanic basin scale. These nuclear techniques have been employed to understand coastal and marine ecosystems via laboratory and field studies in terms of how aquatic organisms respond to environmental stressors, including temperature, pH, nutrients, metals, organic anthropogenic contaminants, and biological toxins. Global marine issues, such as ocean warming, deoxygenation, plastic pollution, ocean acidification, increased duration, and intensity of toxic harmful algal blooms (HABs), and coastal contamination are all impacting marine environments, thereby imposing various environmental and economic risks. Being able to reliably assess the condition of coastal and marine ecosystems, and how they may respond to future disturbances, can provide vital information for society in the sustainable management of their marine environments. This paper summarizes the historical use of radiotracers in these systems, describes how existing techniques of radioecological tracing can be developed for specific current environmental issues and provides information on emerging issues that would benefit from current and new radiotracer methods. Current challenges with using radioecological tracers and opportunities are highlighted, as well as opportunities to maximize the application of these methods to greatly increase the ability of environmental managers to conduct evidence-based management of coastal and marine ecosystems.
  • Article
    Fukushima Daiichi–derived radionuclides in the ocean : transport, fate, and impacts
    (Annual Reviews, 2016-06-30) Buesseler, Ken O. ; Dai, Minhan ; Aoyama, Michio ; Benitez-Nelson, Claudia R. ; Charmasson, Sabine ; Higley, Kathryn ; Maderich, Vladimir ; Masqué, Pere ; Morris, Paul J. ; Oughton, Deborah ; Smith, John N.
    The events that followed the Tohoku earthquake and tsunami on March 11, 2011, included the loss of power and overheating at the Fukushima Daiichi nuclear power plants, which led to extensive releases of radioactive gases, volatiles, and liquids, particularly to the coastal ocean. The fate of these radionuclides depends in large part on their oceanic geochemistry, physical processes, and biological uptake. Whereas radioactivity on land can be resampled and its distribution mapped, releases to the marine environment are harder to characterize owing to variability in ocean currents and the general challenges of sampling at sea. Five years later, it is appropriate to review what happened in terms of the sources, transport, and fate of these radionuclides in the ocean. In addition to the oceanic behavior of these contaminants, this review considers the potential health effects and societal impacts.