The structure of background-error covariance in a four-dimensional variational data assimilation system: Single-point experiment

Ensemble estimation of background-error

Ensemble estimation of background-error variances in a three-dimensional variational data assimilation system for the global ocean

✍ N. Daget; A. T. Weaver; M. A. Balmaseda 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 354 KB

## Abstract This paper studies the sensitivity of global ocean analyses to two flow‐dependent formulations of the background‐error standard deviations (σ^b^) for temperature and salinity in a three‐dimensional variational data assimilation (3D‐Var) system. The first formulation is based on an empir