IMPORTANT: Added some enhacements

[arango]

Added coupled of enhancements:

• Added the capability to write surface air temperature (Tair) to history, quicksave and average, output NetCDF files. Sometimes it is advantageous to write out the air temperature used in the net surface heat fluxes when BULK_FLUX or atmospheric coupling is activated.

The standard input script roms.in includes:

...
Hout(idTair) == F       ! Tair               surface air temperature
...
Qout(idTair) == F       ! Tair               surface air temperature
...
Aout(idTair) == F       ! Tair               surface air temperature

Warning: All the ROMS standard input files were modified to include the logical switches to write out surface air temperature including the one on the test repository.

Code was added to the output routines def_avg.F, wrt_avg.F, wrt_his.F, and wrt_quick.F. The files def_his.F and def_quick.F already have the definitions for adding Tair.

• Modified diag.F and close_io.F to provide more information when ROMS blows-up. The blowup_string in diag.F stores the reason why the model is blowing-up. For example, we can get:

  Blowing-up: Saving latest model state into  RESTART file
      REASON: MaxDensity =  9.1E+03
  

• Updated ESMF coupling input script coupling_esmf.in to include the nested grid number (NestedGrid keyword) when merging field from DATA and ESM components.

  ! Weighted coefficients for the merging of DATA component fields with the same
  ! field from other ESM components. Melding coefficients are positive and MUST
  ! add to unity. They are read from an input NetCDF file ('WeightsFile'). The
  ! user needs to specify the NetCDF variable names for the weights for the DATA
  ! ('VnameDATA') and ESM ('VnameESM') components. Also, specify which grid
  ! ('NestedGrid') needs a merged field from DATA and ESM components. Currently,
  ! the weight values are only needed by the atmosphere component.
  
  WeightsFile(atmos) =  meld_weights_atm.nc
    VnameDATA(atmos) =  data_weight
     VnameESM(atmos) =  ocean_weight
   NestedGrid(atmos) =  1
  

  It is possible to couple directly with one of the nested grids only, for example:

Here, the red box is the regional ROMS grid while the black domains are the atmospheric coarser (45km) and finer nest (15km) grids. The coupling between the ROMS and the atmospheric model can be done with either the coarser grid (NestedGrid(atmos)=1) or the refined grid (NestedGrid(atmos)=2). The DATA component is used to provide SST in grid cells not covered by ROMS. The weighted coefficient are used to meld DATA (SST from HyCOM) and ROMS components.