p_interp will interpolate WRF-ARW netCDF output files to user specified pressure levels.

------------- Compile ------------------------------

A netCDF library is needed for compiling the code.  The MPI library is needed for running 
parallel.  There are many options for compiling at the top of p_interp.F90.

Serial Compile

      pgf90 p_interp.F90 -L/usr/local/netcdf/lib -lnetcdf -lm  \  
      -I/usr/local/netcdf/include  -Mfree  -o p_interp

Parallel Compile:

      mpxlf_r -qfree=f90 -L/usr/local/netcdf/lib -lnetcdf -lm \
      -I/usr/local/netcdf/include -o p_interp p_interp.F90 -WF,-D_MPI

If successful, this will create an executable called p_interp.

------------- Namelist Options ----------------------

New options in the namelist:

 met_em_output  = .FALSE.   Set to .TRUE. to calculate and output fields needed in 
                            a met_em file.  These files are used as input to real.exe.
 split_output   = .FALSE.   Set to .TRUE. to output each time in the input file to 
                            a separate file.
 mpi_debug      = .FALSE.   Set to .TRUE. for additional output that may be helpful
                            when debugging parallel code.


Info about running with met_em_output = .TRUE..  Other options need to be set in the namelist:

split_output = .TRUE.
unstagger_grid = .FALSE.
extrapolate = 1
process = 'all'

If you forget to set any of the first 3 options, they will be reset automatcially in the code.
If process is set to 'list', the code will stop and the user will have to set process to 'all'.

p_interp will stop if met_em files already exist.  This is to avoid overwriting any met_em files
created by metgrid.exe.

------------- Run ------------------------------

To run serially:

unix> p_interp

To run parallel (Aix):

      mpirun.lsf p_interp

=====================================================================================================================

Ejemplo en cluster (area51)
slonin@master ~/WRFV33/WRFV3/main/P_INTERP $ gfortran p_interp.F90 -L-L/tools/lib -lnetcdf -lm -I/tools/include -o p_interp
slonin@master ~/WRFV33/WRFV3/main/P_INTERP $ ldd p_interp
	linux-vdso.so.1 (0x00007fffe45d7000)
	libgfortran.so.3 => /tools/lib/libgfortran.so.3 (0x00002ae9acf38000)
	libm.so.6 => /tools/lib/libm.so.6 (0x00002ae9ad24c000)
	libgcc_s.so.1 => /tools/lib/libgcc_s.so.1 (0x00002ae9ad547000)
	libquadmath.so.0 => /tools/lib/libquadmath.so.0 (0x00002ae9ad75c000)
	libc.so.6 => /tools/lib/libc.so.6 (0x00002ae9ad991000)
	/tools/lib64/ld-linux-x86-64.so.2 (0x00002ae9acd14000)
slonin@master ~/WRFV33/WRFV3/main/P_INTERP $ mv p_interp ../../run/