A new way of computing semi-Lagrangian advection in the IFS
Diamantakis, Michail ; Váňa, Filip
Modern weather and climate prediction models, such as the one used in ECMWF's Integrated Forecasting System (IFS), are complex multi-component software systems simulating Earth system processes. At the heart of each Earth system model lies its dynamical core. Its purpose is to solve the equations that govern atmospheric motions. Those equations link all atmospheric dynamical and physical processes which provide 'source terms', in other words the 'fuel' that generates all types of atmospheric motions. Here we present a new, efficient and simple iterative algorithm to compute semi-Lagrangian advection, which deals with the transport of heat, momentum, moisture and atmospheric constituents. It will be introduced in the next upgrade of the IFS planned for 2023.</p>
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