4DVar Tutorial Introduction
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4-Dimensional Variational (4D-Var) Data Assimilation Tutorial
This page is under construction
Download the code
All of the additional scripts necessary to run the 4D-Var tests are available from the ROMS Subversion (SVN) repository. The 4D-Var test cases are for the California Current System, 1/3 degree resolution, (WC13).
> svn checkout --username joeroms https://www.myroms.org/svn/src/test my_test
Directory Structure
When the checkout is complete, you will have the following directory structure under your my_test directory.
/WC13 Main California Current System 4D-Var applications
/ARRAY_MODES Stabilized representer matrix array modes and clipping
/Data Input data directory
/Functionals Analytical expression header file
/I4DVAR Primal form of incremental, strong constraint 4D-Var, I4D-Var
/I4DVAR_impact I4D-Var observation impact
/Normalization 4D-Var error covariance normalization coefficients
/plotting 4D-Var plotting scripts (Matlab and ROMS plotting package)
/PSAS Dual form of 4D-Var, Physical-space Statistical Analysis System, 4D-PSAS
/PSAS_impact 4D-PSAS observation impact
/PSAS_sensitivity 4D-PSAS observation sensitivity (adjoint of 4D-PSAS)
/R4DVAR Dual form of 4D-Var, indirect representer method, R4D-Var
/R4DVAR_impact R4D-Var observation impact
/R4DVAR_sensitivity R4D-Var observation sensitivity (adjoint of R4D-Var)