Geopotential height field from calc_ecmwf_p.exe

[kyle_r]

Hello,

I am attempting to process ERA5 forcing data for use within WRF, but I am unable to obtain geopotential height from calc_ecmwf_p.exe. I've ungribbed both surface and 3-D fields, and they contain SOILHGT (surface), TT (3D), and SPECHUMD (3D) (please see attached output from rd_intermediate.exe). I am then able to successfully run calc_ecmwf_p.exe, which only has a warning regarding not computing RH (calc_ecmwf_out.txt). When I run rd_intermediate.exe on a "PRES" intermediate file, it only shows PRESSURE as being in the file (intermediate_PRES.txt). From the description of calc_ecmwf_p.exe in the WRF User's Guide, it seems that I have the required variables for computing a 3D geopotential height field, but I don't see any indication of it in the intermediate files. Does anyone know why calc_ecmwf_p.exe isn't outputting geopotential height? Thank you

 

[kwerner]

Hi,
I don't believe you should need to use the calc_ecmwf_p.exe program when using ERA5 data. Have you tried without using it and just running WPS following the instructions in How to Process ERA5 Data?

 

[kyle_r]

Apologies, I should have mentioned that I downloaded the data on model levels instead of pressure levels because model-level data is required for a separate part of our study.

 

[kwerner]

Hi, apologies for the delay in response. I've been out of the office. Thank you for your patience. If you're still having trouble with this, will you attach the "ecmwf_coeffs" file you used for running the calc_ecmwf_p.exe program? Thanks!

 

[kyle_r]

No worries. I've attached the coefficient table that I used. I couldn't get it sorted out, so I ended up using the instructions from the ECMWF website for calculating geopotential on model levels, which I then use to calculate geopotential height. Ungrib is locating my geopotential height files, so it seems like everything is working ok with my current workflow.