Instructions for Converting OGCM Data to Conference Format

The data files in the sample data directory were produced using the programs posted here. Please feel free to use any method you desire to convert the data but is important that all data be in netCDF format and on the same grids and in the same units. If your data is already in netCDF format these programs should ease the conversion process. The programs require Ferret, netCDF, and a Fortran compiler.

1. 30N-30S 2-D fields on 2.5 deg. x 2.5 deg. grid

There are four files available to facilitate this conversion:

File 1. Journal file for Ferret regridding and data dumping.
File 2. Script file for generating netCDF files.
File 3. NetCDF description file.
File 4. Fortran program for loading the netCDF file.

File 1 will allow users who have their data in netCDF format to use Ferret to regrid the data on the 25 x 144 grid and dump the data to unformatted binary files. Files 2-4 will create a netCDF file and load the unformatted data into this netCDF file. The following changes will be needed to suit the inividual user. They are listed by file number:

1. The "netcdf_input_file_goes_here" file will have to be changed to the user's file name. This .jnl file is setup to dump 240 months of data.The user will have to modify this as required. Please note that this file is for CCM3 model output and dumps more fields than the rquested number of fields. In some cases multiple fields are used to calculate the requested fields
2. The .csh file will have to be modified to point to the location of the netCDF libraries and executables. This program generates the netCDF file. Compiles the loading program and then runs the loading program.
3. The .cdl file should only require that the user change the description entry near the bottom of the file to an appropriate entry for their data.
4. The fortran program will have to be updated to point to the proper location of the netCDF include files. Search for "include" to find the location to make the change. Please note that when the data is read in various factors are applied to make the proper unit conversions. Some values are calculated from multiple input files (such as precipitation and relative humidity).

2. Zonal Sections

There are four files available to facilitate this conversion:

File 1. Journal file for Ferret regridding and data dumping.
File 2. Script file for generating netCDF files.
File 3. NetCDF description file.
File 4. Fortran program for loading the netCDF file.

The example files are set up to produce the 10W zonal section. Changes have to be made to Files 1, 2 and 4 will have to be changed by replacing every occurance of 10W with the appropriate longitude to produce the other sections. File 3 will have to have the longitude changed in the grid description. The longitude will have to be converted to degrees east of the prime meridian when updating this file. File 1 will allow users who have their data in netCDF format to use Ferret to regrid the zonal sections and dump the data to unformatted binary files. Files 2-4 will create a netCDF file and load the unformatted data into this netCDF file. The following changes will be needed to suit the inividual user. They are listed by file number:

1. The "netcdf_input_file_goes_here" file will have to be changed to the user's file name. This .jnl file is setup to dump 240 months of data. This .jnl file will have to be run once for every zonal section
2. The .csh file will have to be modified to point to the location of the netCDF libraries and executables. This program generates the netCDF file. Compiles the loading program and then runs the loading program.
3. The .cdl file should only require that the user change the description entry near the bottom of the file to an appropriate entry for their data.
4. The fortran program will have to be updated to point to the proper location of the netCDF include files. Search for "include" to find the location to make the change. Please note that when the data is read in various factors can be applied to make the proper unit conversions. The value of "nt" will have to be changed to allow for the number of months in the user's data. The program will compute the climatology from the monthly data.