Processing and Viewing the Output

The standard QTCM1 package includes pre-written scripts, routines, and control files that utilize standard FORTRAN 77, NCAR Graphics or GrADS to plot the time series of selected output fields. These files are found in directory proc.

The FORTRAN 77 and NCAR Graphics programs require compilation before being used for the first time. These include:

checkdata.f

FORTRAN program to find out how many time levels QTCM1 output files q.out or qmean.out contain.

xy.f

NCAR Graphics program that creates a gmeta file from the file timeseries.out that can be viewed by idt or ctrans. To create this command, compile xy.f using FORTRAN with links to selected NCAR Graphics libraries.

The GrADS scripts provided do not need to be compiled; just execute them within the GrADS program. The output files from QTCM1 provide GrADS binary (Fortran sequential unformatted) data. Note that in GrADS, for , , over global longitude and latitude S to N, grid box (1,1) of the output is located at longitude E, latitude S. Some of the GrADS scripts and control files provided with with the QTCM1 tar package include:

o.ctl

This control file is configured for monthly output from a 10-year run forced with climatological SST. Note that this file assumes the output is produced on a machine using ``big-endian'' format (e.g. SUN).

qtcmpar.gs

Script for defining QTCM1 parameters used in calculating surface wind, etc.

clim16yr.gs

Calculates climatology of a variety of fields for a 16-year run with output given every 30 days. Climatological fields are denoted by attaching a ``c'' to the end of the field name, e.g. ``precc'' for climatology of ``prec'', the precipitation. To use clim16yr.gs, qtcmpar.gs must be present in the same directory.

anom16yr.gs

Calculates anomalies of a variety of fields for a 16-year run with output given every 30 days. Anomaly fields are denoted by attaching an ``a'' to the end of the field name, e.g. ``preca'' for anomaly of ``prec'', the precipitation. This script requires clim16yr.gs be run first.

dump.gs

This script creates a file called ``meta'' which contains ``quick and dirty'' January and July climatology plots for essentially every field output. Requires output from a 16-year run with output given every 30 days. To create a Postscript file from ``meta,'', type in the command

gxps -i meta -o fname

where fname is the name of the Postscript file being created.

A few other useful examples of GrADS scripts are also included in the QTCM1 distribution. For example, flux.gs defines various fluxes; precEQ.gs was used to plot Figure 16 in Zeng et al. [2]. All the scripts listed above require that you first open a GrADS control file before use. GrADS scripts end with the extension ``gs'', while GrADS control files end with ``ctl''.

For more information on the output file formats, see Section 1.4.2.