The Eleventh BMB-NCAR Project Meeting

Time: 03:30~05:00 pm, Nov 15, 2005

Participants: Dir. Kuo, Dr. Huang, Dr. Guo, Shui-Yong Fan

 

1.   The project review

Dr. Huang and Shui-Yong have started to prepare the project review to be presented to BMB at the beginning of December. Shuiyong showed the draft presentation. Dir. Kuo and Dr. Guo provided their comments and suggestions. Dr. Huang and Shui-Yong will continue to work on the presentation and should have a modified version next week.

2.   Discuss the project progress

á      Parallel runs

Shui-Yong showed the verification diagrams of EXP07 and EXP08 and EXP09.

 

EXP07: ncar3dvar with BMB BES. And namelist.3dvar is the same as that of BMB OPR(operational system) except len_scaling=1 and var_scaling=1. This means no factors will be added to background error.

EXP08: an experiment with Cressman analysis as another reference in addition to EXP0 (OPR) and EXP4 (NoOBS).

EXP09: wrfvar with new BMB BE generated by gen_be for mm5 with half-month series of BMB OPR forecast fields. Namelist options are len_scaling=1 /var_scaling=1/chech_rh=2/sfc_assi=1.

 

The scores of EXP08 with Cressman analysis are worse than those from most of 3D-Var experiments. Dr. Huang was pleased with the results as he and Chen Min had the opposite results in the MM5DFI paper.

 

It is very encouraging to see EXP09 has the best scores for all upper air variables. The surface scores are not the best, but comparable with EXP0 (OPR). This is the most important progress made so far in the project, as EXP09 uses the latest version of WRF-Var and the new BE generated by gen_be_stag0 from the mm5 (as the BMB operational system) forecasts. This will ensure the future BMB operational system benefits from all future development of WRF-Var. This should be the starting point for our next round of tuning. Shui-Yong found different SFC_ASSI options give very different assimilation results. Dr. Huang suggested that one more experiment with the other SFC_ASSI should be done.

  

á      Gen_be work

Shui-Yong has done more tests to the code gen_be for mm5, including T/RH/Psfc difference field tests. There are no problems found in the current code. Shui-Yong got a new BE with the code and did an experiment with this new BE (EXP09).

 

Shui-Yong also showed some BE structure function plots but more details about the new BE will be investigated.

á      WRF model work

Shui-Yong tried two methods to get the IC of WRF model from CMA T213 global data: one is changing T213 data to wrfsi intermediate data format and then using wrfsi; the other is changing MM5 REGRID output to the format wrfsi can deal with by using the transform package mm5_p_convert. But T213 has no soil temperature and wrf model cannot run without soil temperature (from Wei Wang). And some cases make error and damp with the second method.

3.   Make a task list

á      Complete the project review presentation.

á      Run two more experiments, one is wrfvar with new BE and namelist options same as EXP09 except SFC_ASSI=2 (SFC_ASSI=1 in EXP09); the other is to replace T213 by AVN forecast field as the model firstguess.

á      Solve the problem of WRF model and run it.

4.   Next meeting

 

Next meeting will be at 2:00 pm Tuesday 29 November 2005.