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A 3D ensemble variational data assimilation scheme for the limited‐area AROME model: Formulation and preliminary results

This paper presents the formulation and preliminary results of a 3D ensemble‐variational data assimilation algorithm (3DEnVar) for the AROME‐France model at 3.8 km horizontal resolution. This algorithm is a deterministic, variational data assimilation scheme that uses background‐error covariances sampled from an ensemble. Our ensemble is an ensemble of data assimilation (EDA) at convective scale, based on the same system with the same spatial resolutions.