PARAMETERIZATION OF WET DEPOSITION OF RADIONUCLIDES

摘要

Processes removing radionuclides from the atmosphere, and their interaction with the Earth's surface, are very important for modeling atmospheric transport and consequences of nuclear accidental releases. However, in most long-range air pollution models the parameter-izations used for the removal processes do not consider effects of nuclide particle size. This paper suggests some parameterizations of the removal processes by wet deposition of radionuclides to the surface, and their realization on example of the Danish Emergency Response Model of the Atmosphere (DERMA). DERMA, a 3-D Lagrangian long-range dispersion model using a puff diffusion parameterization (S0rensen, 1998), is developed at DMI for nuclear emergency preparedness purposes. For nuclear emergency response and for post-accidental analysis, new versions of the DERMA model including different complexities of the deposition parameterizations are suggested.