Doubt about ROMS surface forcing files

[met-sree]

Dear all,
I want to run the COWAST model (WRF+ROMS+SAWN), similar to the Sandy test case.

1. When coupling the ROMS model with WRF, won't it take surface forcing files from WRF? Do we need to provide them externally?

2. If my WRF initial condition is from GFS, can I use surface forcing files from ERA? Is that a good approach?

3. I am trying to extract the forcing files from GFS for the recent year (2023), but the code provided in "roms_wilkin" is not working due to changes in the data path. I also tried extracting the data using "ncei_2roms.m," but it is showing an error:
   going to get GFS grid 4 0.5deg data
   getting GFS grid 4 0.5 deg data at 20230611T000000
   lwrad down is not available for GFS
   lwrad up is not available for GFS
   swrad down is not available for GFS
   swrad up is not available for GFS
   rain is not available for GFS
   and atlast error: at var = double(ncread(url,'Pressure_reduced_to_MSL_msl'));
   like, Error in netcdf.open (line 67)
   [varargout{:}] = netcdflib ( 'open', filename, varargin{1} );

Please provide your suggestions to overcome this issue.

Thank you,
Sree

[jcwarner-usgs]

1- if you have roms and wrf coupled, and you #define ATM2OCN_FLUXES, or #define BULK_FLUXES, then WRF will send the necessary fields to ROMS to compute the surface heat and momentum fluxes. And WRF will get the SST from ROMS. So you do not need any surface forcing files for ROMS.

2- sounds like a question for the WRF forum. this forum is more on the coupling. But in general, if the init condition is not too different than the forcing, then the model should be ok. it is best to run the model for several days or so before the time period of interest.

3- yes i know that GFS doe not have all the data sometimes.
the package from Wilkin should work to get ecmwf data.
if you have a problem with that package, you could post a message on the ROMS forum.

[met-sree]

Thank you Sir.