ALATNET Seminar on Data Assimilation
Lecture 5
TL/AD Techniques
- 5.1 Adjoint technique - general description
- definitions and properties of TL/AD operators
- TL/AD models and their validations
- use of TL/AD models and operators in a variational analysis
- 5.2: Linearized models (diabatic vs. adiabatic)
- description of the physical parametrizations for TL/AD models
- accuracy of the linearization --> evaluation of TL approximation
--> importance of regularization
- impact of including the physical parametrizations in the linearized model
- 5.3: Practical use of adjoint models
- physical parametrizations and data assimilation (4D-Var, 1D-Var)
- sensitivity studies
- tuning of the physical parametrizations
- singular vectors
Postscript document
Practical Advanced Tutorial 5
- PAT 5.1
- some recipes for tangent linear and adjoint coding
- validation methods
- practical exercise of coding and validation
- PAT 5.2
- coding simple example of using adjoint technique for sensitivity
- using adjoint for tuning of the physical parametrizations
- PAT 5.3
- solving a simple analysis problem
- PAT 5.4:
- 1D-Var assimilation of surface parameters or precipitation or clouds