53 citations · 100 across the 3 of their papers we have counts for
3 papers
Four-dimensional variational assimilation in the unstable subspace (4DVar-AUS) and the optimal subspace dimension
Anna Trevisan, Massimo D'Isidoro, Olivier Talagrand
A key a priori information used in 4DVar is the knowledge of the system's evolution equations. In this paper we propose a method for taking full advantage of the knowledge of the s…
Controlling instabilities along a 3DVar analysis cycle by assimilating in the unstable subspace: a comparison with the EnKF
A. Carrassi, A. Trevisan, L. Descamps +2
A hybrid scheme obtained by combining 3DVar with the Assimilation in the Unstable Subspace (3DVar-AUS) is tested in a QG model, under perfect model conditions, with a fixed observa…
Data assimilation as a nonlinear dynamical systems problem: Stability and convergence of the prediction-assimilation system
Alberto Carrassi, Michael Ghil, Anna Trevisan +1
We study prediction-assimilation systems, which have become routine in meteorology and oceanography and are rapidly spreading to other areas of the geosciences and of continuum phy…