Hi Keith,
After I merged my code (ctsm5.1.dev108) with release-cesm2.2.03, the newly merged code requested more definitions of one variable. I compared the old code and merged code, I didn't delete anything about 'fan_nh3_to_atm'. Do you know if this question was caused by the different cime versions?
Best,
ERROR: Variable 'fan_nh3_to_atm' from file '/glade/work/jinmuluo/cases/DerechoTest/Buildconf/clmconf/drv_flds_in' is not in the namelist definition.
old code (works well on cheyenn, CTSM): /glade/u/home/jinmuluo/CLM-FANv3
Newly merged code: /glade/u/home/jinmuluo/CLM-FANv3tag01