Problems adding invariant SST from OI to ERA5 data

[rjhall]

I am using ERA5 data from Copernicus, and wanting to use an initial SST field from the OI dataset, using a different date to those of the model run. I have converted the SST to intermediate format using the pywinter package and checked that when I convert it back to netcdf it matches the original SST timestep field.
I am using ERA_INVARIANT and the SST intermediate file in the constants name section of WPS. I have changed the date of the SST intermediate file to match the first timestep of the model run.
Everything runs and I get model output. However, when I look at the SST field in the model output it makes no sense. However if I just run everything with the ERA5 SST field I can see a sensible SST field in the output. I don't know what is wrong I'm afraid. Attached are screenshots of the two different SST fields and the namelist.wps file

 

[rjhall]

I should also add that I removed the SST line from the ECMWF table

 

[Ming Chen]

If you use SST from OI dataset, you need to modify METGRID.TBL and add the lands mask for the OI SST. Please take a look at the document

https://www2.mmm.ucar.edu/wrf/users/tutorial/presentation_pdfs/201907/duda_wps_advanced.pdf

slides 47-58 specifically address the landmask issue.

Hope this is helpful for you.

 

[rjhall]

Thank you. I have tried to modify METGRID.TBL as shown. If I add "from input =SST" as shown, the attached error is returned. If I just add the landmask as shown then the whole thing runs but with the same problem as before. Should I be using a different land mask for the OI SST? If so where do I obtain this? To reiterate, I didn't use ungrib on the OI dataset, as it is supplied as netcdf, so I used the pywinter package to create the intermediate file, without the use of a Vtable. I think there is something that I am not understanding here!