Column level CH4 output not writing to history

[wwieder]

Brief summary of bug

I'm unable to get column level output with the following history variables.

'CH4_PROD_COL','CH4_OXID_COL',
'CH4_OXID_DEPTH_SAT','CH4_OXID_DEPTH_UNSAT',
'CH4_PROD_DEPTH_SAT','CH4_PROD_DEPTH_UNSAT'

These diagnostics would be helpful for WIEMIP.

General bug information

Running on the wetland branch branch_tags/wetlands.n03.ctsm5.4.029-5-ga7d904abb

Hash on the end includes usermods in #3950 (latest not yet pushed), but briefly using the following in user_nl_clm

...
hist_nhtfrq = 0,0,0
hist_mfilt = 1,1,1
hist_dov2xy = .true., .false., .false.
hist_type1d_pertape = 'GRID','COLS','PFTS'
...
hist_fincl2 = 'H2OSFC','H2OSNO','ZWT','ZWT_PERCH','FROST_TABLE',
   ...
   'CH4_PROD_COL','CH4_OXID_COL',
   'CH4_OXID_DEPTH_SAT','CH4_OXID_DEPTH_UNSAT',
   'CH4_PROD_DEPTH_SAT','CH4_PROD_DEPTH_UNSAT', 
   ...

Important details of your setup / configuration so we can reproduce the bug

Case directory is here /glade/work/wwieder/wiemip/clm6_hh_ukesm_ctrl

Important output or errors that show the problem

several cesm.logs have errors like:
htapes_fieldlist ERROR: CH4_PROD_COL in fincl( 31 ) for history tape

see unzipped log files /glade/derecho/scratch/wwieder/archive/clm6_hh_ukesm_ctrl/logs

[wwieder]

@swensosc or @slevis-lmwg can you help with this?

[slevis-lmwg]

I will start troubleshooting.

[slevis-lmwg]

@wwieder my first suggestion is to try hist_wrtch4diag = .true. in your user_nl_clm because I see this as an if statement around these history fields.

In namelist_definition_ctsm.xml, this setting is documented as "If TRUE, add extra diagnostics for methane model to the history files"

[wwieder]

Ah, I wondered about that, will give it a shot. Thanks

[wwieder]

OK, that does turn on the requested diagnostics on the h1 files (column output). 🥳

It also adds a bunch more diagnostics to the h0 files (gridcell output) that may not be as relevant, including a bunch of vertically resolved variables, but maybe that's OK? What's the behavior we want to support longer term, @swensosc ?

[swensosc]

I'm not sure how the activation works, but it might be best if a variable could be added to history via the namelist option that sam mentioned, *or* via adding to the fincl_ array. Then you could get the suite of variables if you wanted (via namelist flag) or individually. It seems like now it's one or the other.

…

On Wed, May 27, 2026 at 5:05 PM will wieder ***@***.***> wrote: *wwieder* left a comment (ESCOMP/CTSM#4051) <#4051 (comment)> OK, that does turn on the requested diagnostics on the h1 files (column output). 🥳 It also adds a bunch more diagnostics to the h0 files (gridcell output) that may not be as relevant, including a bunch of vertically resolved variables, but maybe that's OK? What's the behavior we want to support longer term, @swensosc <https://github.com/swensosc> ? — Reply to this email directly, view it on GitHub <#4051?email_source=notifications&email_token=AGRN57EN6FFUA7OKSVGAB6L445YCRA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTINJVHEZTSMZRGEZKM4TFMFZW63VHNVSW45DJN5XKKZLWMVXHJLDGN5XXIZLSL5RWY2LDNM#issuecomment-4559393112>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AGRN57A6A5CFAWCUS5YPEHT445YCRAVCNFSM6AAAAACZP3NFMWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHM2DKNJZGM4TGMJRGI> . Triage notifications, keep track of coding agent tasks and review pull requests on the go with GitHub Mobile for iOS <https://github.com/notifications/mobile/ios/AGRN57A5MCKMJF72HZZARFD445YCRA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTINJVHEZTSMZRGEZKM4TFMFZW63VHNVSW45DJN5XKKZLWMVXHJKTGN5XXIZLSL5UW64Y> and Android <https://github.com/notifications/mobile/android/AGRN57DCKC3PQAVDTO5BUZL445YCRA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTINJVHEZTSMZRGEZKM4TFMFZW63VHNVSW45DJN5XKKZLWMVXHJLTGN5XXIZLSL5QW4ZDSN5UWI>. Download it today! You are receiving this because you were mentioned.Message ID: ***@***.***>