R, Perldfiez et al. 
but in energetic regions characterized by strong current variability, 
like Fukushima waters and north Pacific, differences between model 
9utputs appear. Although several hydrodynamic models may be pro- 
viding a coherent general picture of water circulation in the area of 
interest, small differences in current magnitude and/or direction in 
‘he area of release result in different initial transport pathways. Even 
small differences are then amplified in time. For this reason a careful 
selection of the ocean model is needed and should be done after a 
detailed comparison with local measurements of currents. In this sense, 
local forecasts of marine circulation should be used for emergency 
nodelling if they are available. 
Acknowledgements 
Work carried out in the frame of IAEFA MODARIA (Modelling and 
Data for Radiological Impact Assessments) and MODARIA-II programs, 
Work partially supported by : project FIS2015-69673-P of the Spanish 
Ministerio de Economfa y Competitividad: Resoluciön de problemas 
ambientales marinos y terrestre clave mediante nuevos desarrollos en 
Espectrometria de Masas con Acelerador de Baja Energia (LEAMS) 
en el Centro Nacional de Aceleradores (CNA):; KIOST Major Project 
PE99712, CKJORC (China-Korea Joint Ocean Research Center) Project 
for Nuclear Safety and State Fund for Fundamental Research of Ukraine 
Project 868/12879 and by IAEA CRP (International Atomic Energy 
Agency Coordinated Research Project) K41017 “Behaviour and Effects 
of Natural and Anthropogenic Radionuclides in the Marine Environ- 
ment and their use as Tracers for Oceanography Studies". The authors 
are also grateful to Mee Kyung Kim for drawing Fig, 2. 
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