Progress in Ensemble Data Assimilation at ECMWF

Massimo Bonavita* and Mats Hamrud

Ensemble data assimilation systems are routinely run at all major NWP Centres for the initialization of ensemble prediction and for the cycling of error covariances to be used in a deterministic assimilation cycle.

In this presentation we will first describe recent upgrades to the operational ensemble data assimilation system at ECMWF, which is based on an ensemble of adjoint-based, perturbed observations 4D-Var analyses.

We will then report on recent results obtained with a quasi-operational configuration of an alternative hybrid EnKF-Var ensemble data assimilation system based on the Hybrid-Gain approach and discuss current areas of research.

*Preference: Oral