Principal objective of RADNOR:
To further constrain radioactive dose assessments for the Nordic marine environment.
To be accomplished through:
1) The determination of levels and time series of 99Tc in benthic and pelagic food webs.
2) Improvements to the understanding of site-specific and time-dependent sediment-water interactions (Kd), kinetics of accumulation (CF) and body distribution in marine organisms.
3) Improvement of the NRPA box model by the statistical analysis of NAOSIM model hindcasts for 99Tc dispersion, the introduction of selectable flow fields and novel and reassessed abiotic and biotic parameters.
OASys is involved into the 3rd task which consists of several subtasks:
· To run hindcasts of the 99Tc dispersion in the Ocean for the period 1970 to present with the NAOSIM circulation model and the NRPA box model
· To set up a 99Tc database which gathers all available historical and modern 99Tc sample analyses
· To perform an intercomparison exercise between model results and the observational 99Tc database
· To perform a statistical analysis of flow patterns with the NAOSIM for the period 1948 to present, and to use the dominant patterns as forcing fields to run the NRPA box model in different circulation states.
· To further improve the NRPA box model by the incorporation of novel and re-assessed Kd and CF values generated through RADNOR field and laboratory studies.
NRPA – Justin Gwynn, Mikhail Iosjpe, Justin Brown
O.A.Sys. – Michael Karcher
AWI – Rüdiger Gerdes
NPI – Sebastian Gerland, Vladimir Pavlov
IFM Univ.Hamburg – Ingo Harms
AUN – Brit Salbu
IMR – Hilde Elise Heldal
Part of the modelling work has been utilized in the AMAP (Arctic Monitoring and Assassment) Report on Radioactivity in the Arctic 2002 which apeard 2004.
RADNOR is funded by the Norsk Forskningsradet (Norwegian Research Council) for the period 2003 to 2005.