CTBT: Science and Technology Conference 2025 - SnT2025

CARATk, a new toolkit for radionuclides atmospheric transport simulation for the CHIMERE model

P2.3-296

Not scheduled

1h

Zeremoniensaal

E-poster T2.3 Atmospheric and Subsurface Radionuclide Background and Dispersion P2.3 Atmospheric and Subsurface Radionuclide Background and Dispersion

Speaker

Mr Léo Adenis (Laboratoire de Météorologie Dynamique)

Description

We present our work on the CHIMERE Assisting Radioactive Analysis Toolkit (CARATk), a new toolkit for the CHIMERE chemistry transport model. This toolkit will permit simulation of transport, chemistry and physical processes of radionuclides in the atmosphere.
Our poster will focus on two main points in our development of CARATk.
Firstly, we validate the eulerian transport CHIMERE by comparing CHIMERE performances to the Lagrangian model FLEXPART, frequently used in radioactive pollution modeling, in the context of the Ru-106 pollution detected in 2017 over the Northern Hemisphere.
Secondly, we will elaborate what is CARATk, what is its aim and what is it already capable of modeling. We will present uses of CHIMERE with CARATk in the context of the Fukushima accident to illustrate some of its capabilities, limitations and prospects for future developments. We simulated a purely theoretical emission of the first element of 99 radioactive decay chains and checked that all daughter nuclides were appearing correctly with 806 reactions. We also compared the results of a simulation using the real emission with data from IMS stations for Iodine-131 and Xe-133.