Multiple Input files for regional run

[F-Colby-UML]

Initializing a regional run using GEFS ensemble members requires running ungrib on two separate input files, which are designated as A and B from the Amazon Cloud. For the WRF model, this is straightforward. You run ungrib separately on each set, then merge them in metgrid.

The B files have data at more levels than the A files have data at mandatory levels only (1000, 925, 850, ....). But the B files have only 3 soil levels and do not have a surface pressure value. This last limitation does not allow the WRF to initialize. Blending the A and B files provides enough data to initialize the WRF.

How do I do this for MPAS? The tutorial only shows how to add SST data to a regional initialization. I can run init_atmosphere on the B files first, but if I run init_atmosphere a second time on the A files, how do I ensure that the output will be merged instead of overwritten?

Thanks,
Frank Colby
UMass-Lowell

 

[Ming Chen]

Hi Frank,

Let's try the linux command: cat fileA fileB > FILE, then use FILE to run init_atmosphere.

Please let me know whether this method works for you.

 

[F-Colby-UML]

HI Ming,
The cat command seemed to work well and I was able to run the init_atmosphere program without errors. The model run itself failed, with no error messages, but I think I overwhelmed the computer I'm using. Too many grid points I think. I can't get anything to show in the history files except the very first output showing the beginning of the run. So thank you for your help. I'll try a smaller grid to make sure it runs.