4DVAR minutes 01/05/06

AFWA 4D-Var meeting Hans, Dale, Qingnong, John M, Tom, John B, Chris 2:00-3:20 pm, 01/05/2006. Lilly room

1. The task list from the last meeting

1) Review and maintain the WRF-Var framework after Wei

Tom described what have been done since the last meeting. The merge of WRF and WRF-Var (3D-Var part) is almost completed and tests can be done for both model and var using the same setup. The script system for testing needs further refinements. Dave and John B will join the work and take over part of the responsibility from Tom.

2) Develop nest-up/down tools

Due to the MMM regional climate project, the work had to be moved to 2006.

3) Re-write xatowrftl related subroutines

Done.

4) Perform top-level TL and AD tests on the IHOP case and …

It was found out the IHOP grid is too large for the current 4D-Var.

5) Prepare 1h obs for the IHOP case

We need to wait for MPP code.

2. 2005 report

Hans wrote the 4D-Var part of the 2005 report for AFWA project. Dale will complete the report by revising it and adding the WRF-Var part to it. He already sent the current version to AFWA.

Only one modification is needed to correct the statement on the interpolation task.

3. 2006 tasks

The 2006 project should start now (not Oct 2005 as in the draft SOW). John M and Dale will confirm this soon. The dates we set for different tasks should be shifted by one or two months accordingly. Hans pointed out the missing 0.25FTE in the 4D-Var. The possible KMA contribution to 4D-Var may be used here. We may have some leftovers in the project and John will check the budget. Afterwards we need another discussion.

Hans also stressed the importance of the SE work (3.2b, 3.3b, 3.3c) and asked whether we could get the work done by June or July. John M thought given the FTEs including the missing 0.25FTE the work should be done by then.

Dale questioned why the testing/tuning task depends on coupler and MPP tasks. Hans clarified his statement and said the testing/tuning task started already and would continue with the minimum grid configuration. However, the testing/tuning with realistic configuration requires the coupler and the MPP code.

4. The major missing components

1) Physics TL and AD

The AFWA 2006 task only involves simple vertical diffusion. Laura from CSU plans to get the CSU microphysics scheme, including TL and AD, into WRF. After she gets nonlinear code implemented, Qingnong will join her to get the TL and AD code in. There has also been discussion for some time on getting Jenny involved in the microphysics work, implementing another scheme. It was agreed at the meeting that we should discuss this again after we get a new budge estimate from John M.

2) JcDFI

Hans mentioned that missing Jc could cause problems for WRF 4D-Var. He wants to see this one done this year. Dale was concerned about loosing foci and mentioned that JcDFI would be a task for AFWA 2007. It was agreed that this could be done only if extra funding or “free” manpower were available.

3) Jbdy

Similar arguments as those for JcDFI were made on this term.

5. Other issues

• Dale, Hans and John B will visit AFWA on Jan 18-20. One of the tasks will be to install the current 4D-Var on the IBM of AFWA. Hans and John will go through the installation on bluesky next week. • Qingnong reminded the group that our TAF license will end this year and suggested making good use of it. If we cannot allocate manpower to physics work, we should at least generate TL and AD for all available WRF physics subroutines. • Hans explained his recent contact with Xin Zhang from Hawaii Univ. Xin has been thinking to apply the NCAR visiting program to work on JcDFI. • Hans promised to organize the 4D-Var project meeting regularly and write meeting memos for records.