Applications based on COSMO Model output

A Lagrangian Particle Dispersion Model (LPDM) may in case of accidental radioactive releases be run "on demand" to predict long-range transport, dispersion, and wet and dry deposition of radioactive material. The calculation of about 100 000 particle trajectories is based on wind fields from the COSMO Model and the stochastic simulation of turbulent fluctuations (so-called Monte Carlo simulation). Radioactive decay and convective mixing are taken into account. The concentration is calculated by summing up the particle masses in arbitrary grids.

A Trajectory Model is run routinely twice a day to provide information on transport routes (advection of air masses, passive tracers, and pollen) and guidance for ballooning. It is used in source-oriented (forward) and receptor-oriented (backward) mode. The meteorological input is derived from the COSMO Model at hourly intervals. In the case of accidents with release of toxic airborne material, it is run on demand to provide a quick estimate of the primary dispersion path.

Various other post-processing tools are used to provide tailored products (data and graphics) for various commercial and non-commercial customers, among others a Kalman filter used to remove systematic model biases in the forecast of temperature and humidity at 2 m above the surface.