Cannot obtain CAM monthly history files with more than one time entry

[BenT]

I'm running a basic F2000climo in 2.1.5, just trying to get the output configured.

In order to get some monthly variables, and write more than one month in a single NetCDF file, I have added the following to my user_nl_cam file:

&cam_history_nl
nhtfrq = 0, 0
mfilt = 1, 120
avgflag_pertape = 'A', 'A'
fincl2 = 'PRECL','PRECC','PRECT','PRECTMX','TREFHT','TREFHTMX','TREFHTMN',
'TS','TSMX','TSMN','PSL','RELHUM','CLDTOT','CLDLOW','CLDMED',
'CLDHGH','FSNS','FLNS','FSNT','FSNTOAC','FLNT','LHFLX','SHFLX','TAUX','TAUY',
'FSDS','FSDSC','SST','OMEGA','ZBOT'
/

This is reflected in the ./run/atm_in.

&cam_history_nl
avgflag_pertape = 'A','A'
fincl2 = 'PRECL', 'PRECC', 'PRECT', 'PRECTMX', 'TREFHT', 'TREFHTMX', 'TREFHTMN', 'TS', 'TSMX', 'TSMN', 'PSL', 'RELHUM',
'CLDTOT', 'CLDLOW', 'CLDMED', 'CLDHGH', 'FSNS', 'FLNS', 'FSNT', 'FSNTOAC', 'FLNT', 'LHFLX', 'SHFLX', 'TAUX',
'TAUY', 'FSDS', 'FSDSC', 'SST', 'OMEGA', 'ZBOT'
mfilt = 1,120
nhtfrq = 0,0
/

However, when I run for 100 days, I have not been able to obtain output history files with more than a single sample entry (i.e. a single month). Output is (3) single monthly h1 files.

What am I doing wrong? Thanks!

 

[BenT]

Since it appears I was doing nothing "wrong" and I wasted a whole bunch of time on this, I'll answer my own question.

I was confident that I had made a simple formatting error, but Claude (after getting it wrong twice) and I eventually figured out apparently monthly files are hard coded to a single time step. So, it appears that mfilt is ignored where nhtfrq = 0. My goodness what a ridiculous "feature" without documentation.

CAM and CLM output frequency