UCM model Issue

[climatewind]

I tried to run SL-UCM model by putting sf_urban physics value as 0,0,0,1 in a 4 domain model. The model ran successfully, but whe I ran the same model with urban physics as 0,0,0,0; and removing the use_wudapt lcz from the model, the result came out to be same as previous. Kindly, tell the possible error.
The model version of WRF is V4.4.

 

[Ming Chen]

What files did you compare with and without UCM? How many urban points are there in your domains?
When you say the results are same, did you mean they are bit-for-bit identical?

Another issue is that, it is recommended that all physics schemes (except cumulus) should be same for all domains. In your case, you set feedback = 1 and sf_urban_physics = 0, 0, 0, 1. Such settings can cause inconsistency between D03 and D04. I am perplexed that the model ran to the end successfully.

 

[climatewind]

The output file for domain 4 (D04) are compared in both the cases. As the study area under the domain 4 is a city at 333.33 m resolution, many of the points are urban. The results are bit to bit same, which is creating the concern.

The sf_urban_physics was chosen as 0,0,0,1 to minimize the computational power and memory consumption.

 

[Ming Chen]

can you upload your wrfout_d04 files (with and without urban physics) for me to take a look? Thanks.

 

[climatewind]

The file size is too large. Is there any other way to upload these files?

 

[climatewind]

Any suggestions?

 

[climatewind]

Google Drive: Sign-in Kindly use this drive link to download the files. This will need permission to open, so kindly send request to open while opening the file

 

[htan2013]

Make sure your urban_physics option equals to 0 and 1 for your wrfinput (NO_UCM and UCM).
How identical are your results? Have you compared area-averaged? For example, can you generate a xy plot for 2-m temperature?

 

[climatewind]

The results are point to point same

 

[climatewind]

Mr. Ming Chen any updates?

 

[Ming Chen]

By saying "point-to-point same", do you mean the wrfout files from the two runs are identical?

Can you check whether you have the file 'diffwrf' existing in in WRF/external/io_netcdf? if so, please issue the command:

WRF/external/io_netcdf/diffwrf wrfout_urban wrfout_no_urban > log

(Note I use wrfout_urban and wrfout_no_urban to represent wrfout files form your two runs)

And upload the log file for me to take a look.