basic design |
dynamics and numerics |
initial and boundary conditions |
physical parameterizations |
external parameters |
code and parallelization |
Last updated: September 2011
Continuous four-dimensional data assimilation based on observation nudging, with lateral spreading of upper-air observation increments along horizontal surfaces. Explicit balancing by a hydrostatic temperature correction for surface pressure updates, a geostrophic wind correction, and a hydrostatic upper-air pressure correction.
Radiosonde (wind, temperature, humidity), aircraft (wind, temperature), wind profiler (wind), and surface-level data (SYNOP, SHIP, BUOY: pressure, wind, humidity). Optionally RASS (temperature), and ground-based GPS (integrated water vapour) data. Surface-level temperature is used for the soil moisture analysis only.
Assimilation of near surface rain rates based on latent heat nudging. It locally adjusts the three-dimensional thermodynamical field of the model in such a way that the modelled precipitation rates should resemble the observed ones.