1DVar sample implementations (ECMWF input)

[frcm]

Provide sample implementations of bending angle and refractivity based variational retrievals using ECMWF model level data. This should include:

• Levenberg-Marquardt minimiser
• reference implementation using M1QN3
• minimal QC (BGQC, optional PGE)
• minimal diagnostics (cost function value, scaled cost function value, retrieval error estimates)
• some generic interface for reading error covariance matrices for both background and observations
• simplified error models for observations (Kursinski or so...)

The programs should be stable enough to tun in a quasi-operational environment (i.e., either generate data or abort with an error message). Configuration / process control should work via command line arguments and / or a configuration file.

[Dave Offiler]

Implemented in ropp_1dvar as stand-alone application ropp_1dvar_refrac_ec with ROPP v0.9 (Beta-2) release, adequate for DMI to test pre-ops with.

[(none)]

Milestone 0.9 deleted