ALATNET Seminar on Data Assimilation

Lecture 6

Structure functions

• 6.1 The matrix B: role, sources of information and modelisations.
• 6.2 Illustration of the main features of B.
• 6.3 Use of the inverse square-root of B and its formulations in 3D-Var.

Practical Advanced Tutorial 6

Single observation experiments

• Single observation experiment - an academic test to study and compare the analysis systems and their properties
• How to run single obs experiment with Aladin model
• Multivariate properties of Aladin/3DVAR
• Horizontal and vertical structure of the analysis increments
• Impact of the observation position on the shape/properties of the analysis increments
• Standard vs. lagged Jb statistics
• Recent experiments with data assimilation in Aladin/LACE
• Didactic per-paper exercises