Doug and Stacy:

I have made a single time-gcm netcdf history file containing 12 histories,
one for each mid-month day for 1993 (file is ~112 Mb).
The file is on mss as /FOSTER/kib22mt/peqt_1993.nc

-rw----rw-  1 FOSTER  93300081  111986040 Aug 30 10:16 /FOSTER/kib22mt/peqt_1993.nc
12 mid-month histories for 1993 equinox for waccm

I am attaching an ncdump of this file. The model fields are:
 'TN','N4S','CO','CO2','H2','NO','O1','H','N2D','Z'
These are the fields you requested, plus TN and Z.

I used NCO operator ncrcat to concatenate 12 separate monthly files.
This worked fine, but a side-effect is that some of the variables
(not model fields) are incorrect, e.g., the coord var time(time) is
all 0 (wrong!), and many of the global attributes apply to Jan only. 
The ncrcat command used is in the global attribute "history" on the file.  
However, mtime, year, day, ut, etc., are all correct, e.g.:

 day = 15, 46, 74, 105, 135, 166, 196, 227, 258, 288, 319, 349 ;

These are the days of the year (1->365) for each history corresponding
to the 15th day of jan->dec. These are also the model days given
in mtime(1,time). 

The individual month files (with all model fields) from which peqt_1993.nc
was made are also saved in /FOSTER/kib22mt.

I made a run of our post-processor and saved ut vs latitude and ut vs height 
contours in /FOSTER/kib22mt/peqt_1993.30-110km.cgm. 
Use idt to view this cgm file.

Let me know how it goes..

--Ben