Feature request: Hybrid filter

[hkershaw-brown]

Add hybrid filter assimilation algorithm as an option in DART.

Currently on: https://github.com/mgharamti/DART/tree/hybrid

To do list:

• [ ] Test case /glade/work/gharamti/hybrid/run_hyb_filter
• [ ] low order models
• [ ] the hybrid branch is based on DART pre https://github.com/NCAR/DART/releases/tag/v9.12.0

[hkershaw-brown]

First bash through updating to main (Jeff rector)

https://github.com/NCAR/DART/tree/hybrid-main

Untested.

[hkershaw-brown]

https://github.com/NCAR/DART/tree/hybrid-main-merge

needs:

• mpi utilities mpif08 changes
• hybrid only supported for filter_kinds 1,2. How should this interact with QCEFF which is a per-qty filter_kind

[mgharamti]

Helen, the hybrid scheme should technically work with any filter type. During testing and validating with WRF-Hydro, I only checked EAKF and EnKF. Integrating the scheme with the QCEFF though, might be tricky. We'll need to discuss that.

[jlaucar]

This is my number one priority once I'm back from Asia at the start of July. There are some challenges and we need to discuss whether it should be done in the branch with the smoother capability.

On Mon, Apr 29, 2024 at 9:49 AM Moha Gharamti @.***> wrote:

Helen, the hybrid scheme should technically work with any filter type. During testing and validating with WRF-Hydro, I only checked EAKF and EnKF. Integrating the scheme with the QCEFF though, might be tricky. We'll need to discuss that.

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[hkershaw-brown]

Pre release version for v9.11.7 is here https://github.com/NCAR/DART/releases/tag/v9.11.7-hybrid