Group seminar on 18. May, 14:15 CET

Continuous Data Assimilation in the ECMWF IFS CY46

A new configuration of the European Centre for Medium-Range Weather Forecasts (ECMWF) incremental 4D-Var data assimilation system is introduced, which builds upon the quasi-continuous data assimilation concept proposed in the mid-1990s. Rather than working with a fixed set of observations, the new 4D-Var configuration exploits the near continuous stream of incoming observations by introducing recently arrived observations at each outer loop iteration of the assimilation. This allows the analysis to benefit from more recent observations. I will explain the experimentation and the implications to the Early Delivery system of ECMWF.
Reference:
Lean, P, Hólm, E V, Bonavita, M, Bormann, N, McNally, A P and H Järvinen (2020) Continuous Data Assimilation for global numerical weather prediction. Quart. J. Roy. Meteorol. Soc. https://doi.org/10.1002/qj.3917