Theory

This section splits the model description into a continuous formulation page and a numerical implementation page.

• Equations covers the governing transport equations in conservative (mass-consistent) form, the ERA5-based meteorological interpretation, and the linear process set solved by the forward model.
• Numerical methods covers the mass-consistent finite-volume discretization, advection schemes, vertical diffusion solver, and time-integration options used in TARSA.

Together these pages document the forward operator from the continuous equations down to the discrete update used in the codebase.