Temporal evolution of innovation and residual statistics in the ECMWF variational data assimilation systems

A review of forecast error covariance st

A review of forecast error covariance statistics in atmospheric variational data assimilation. II: Modelling the forecast error covariance statistics

✍ R. N. Bannister 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 401 KB

## Abstract This article reviews a range of leading methods to model the background error covariance matrix (the **B**‐matrix) in modern variational data assimilation systems. Owing partly to its very large rank, the **B**‐matrix is impossible to use in an explicit fashion in an operational setting