INTRODUCTION TO THE CCM PROCESSOR 

                  (Feb 3 1994)

 
The CCM Processor is a batch tool for the analysis of model or
observational data at the National Center for Atmospheric Research
(NCAR), Boulder Colorado.  It can be run on either of the Cray YMPs or
the IBM-RS600/SP1 cluster.  Most frequently the data is in one of 4
history tape formats output by a version of the NCAR Community Climate
Model (CCM).  The data on these files are input to the Processor,
manipulated, and output in various forms, according to a series of
user-specified requests.  The Processor is capable of performing the
following functions:
 

  1)  Analysis of Individual Time Samples (including time series)
  2)  Time Averaging
  3)  Ensemble Averaging
  4)  Time Filtering
  5)  Case Comparison
  6)  Zonal Averaging
  7)  Meridional Averaging
  8)  Vertical Averaging
  9)  Horizontal Area Averaging
  10)  Land/Ocean/Sea-ice Masking
  11)  Horizontal Plotting
  12)  Meridional Cross-Section Plotting
  13)  Latitudinal Cross-Section Plotting
  14)  Time Series Plotting
  15)  Computing New Fields
  16)  Spectral Operations
           a.  Bandpass Filtering
           b.  Horizontal Transformation and Truncation
           c.  Spectral Diagnostics and Graphics
 

Many types of data input to the Processor are allowed.  These include:

  
  Pressure history save tapes,
  Time average history save tapes,
  Time series history save tapes,
  Time average save tapes,
  Time series save tapes,
  Time series plot save tapes,
  List Sorted Data (LSD) save tapes.
 

The history tapes (produced by the model or processor) and the save
tapes (produced by the processor) each have a unique format.  Descript-
ions for the history tapes formats are published in the appropriate
users guides for the corresponding versions of the CCM (see References
on page 59).  The formats for pressure history tapes and the various
types of save tapes are given in the CCM Processor Users Guide.

The Processor is also capable of producing all of the above tape types,
with the exception of obsolete CCM0A history tapes.  Additionally, the
Processor outputs another type of save tape, one which contains only
horizontal slices, and is referred to as a horizontal slice save tape.
The format of this tape is the easiest for the user to read with a
FORTRAN program for the users own external processing or for transmittal
to other institutions.