PCCM2 supports monthly averaging on the primary history tape. This is specified in the namelist by setting the value of NINAVG to the string value `Q' for the primary history tape:
NINAVG = 'Q',
In monthly average mode, PCCM2 writes the primary history data set only once each month. Restart data sets are written at this time as well. Naming of the monthly averaged history volumes and restart data sets differs from normal history output mode. Each volume is named as described in the following on-line documentation in the NCAR release of CCM2.1.
The file naming convention of the monthly average history tape will be of the form mm-yy (mm=month, yy=year). All monthly average restart files will also contain the month and year as part of their names. For example, a monthly average history tape for the month of December during model year 0 will have the file name 12-00. The primary regeneration file that goes with the December average will be r12-00.A.
In addition, if PARHIST = .TRUE. in the namelist, the monthly restart history volumes will be written in volume-decomposed mode: processor row numbers will be appended to the file names. Midmonthly restarts are not supported in the parallel model; monthly average restart files are written at the same time monthly average history is written. As with restart files in normal history mode, the monthly average restart files are written one file per processor.