Flow Dependent Localization (Hodyss and Bishop, QJR)
Ensembles give flow dependent noisy correlations
Stable flow error correlations
km
km
Unstable flow error correlations
Recently, some new
algorithms have been proposed to make localization flow dependent.
When flow is stable, in the
atmosphere on can expect the background error correlations to be larger
scale (errors are larger scale). When flow is unstable (e.g. lots of small
scale turbulence, convection), the errors will also be smaller scale.More sampling error for a finite
ensemble in the unstable situation.