[Bug]: AttributeError: 'int' object has no attribute 'units'

[chengzhuzhang]

What happened?

When testing zppy, @forsyth2 reported an error from derived variable.

  File "/lcrc/soft/climate/e3sm-unified/base/envs/e3sm_unified_1.10.0_chrysalis/lib/python3.10/site-packages/e3sm_diags/derivations/acme.py", line 175, in molec_convert_units
    if var.units == "molec/cm2/s":
AttributeError: 'int' object has no attribute 'units'

What did you expect to happen? Are there are possible answers you came across?

No response

Minimal Complete Verifiable Example (MVCE)

No response

Relevant log output

Example error from /lcrc/group/e3sm/ac.forsyth2/issue_622v5/v3.LR.historical_0051/post/scripts/e3sm_diags_atm_monthly_180x360_aave_mvm_v3alpha04i-COARE_vs_CTL_1985-2014_vs_0001-0050.o607385:

2024-10-16 15:19:15,254 [ERROR]: core_parameter.py(_run_diag:269) >> Error in e3sm_diags.driver.aerosol_budget_driver
Traceback (most recent call last):
  File "/lcrc/soft/climate/e3sm-unified/base/envs/e3sm_unified_1.10.0_chrysalis/lib/python3.10/site-packages/e3sm_diags/parameter/core_parameter.py", line 266, in _run_diag
    single_result = module.run_diag(self)
  File "/lcrc/soft/climate/e3sm-unified/base/envs/e3sm_unified_1.10.0_chrysalis/lib/python3.10/site-packages/e3sm_diags/driver/aerosol_budget_driver.py", line 148, in run_diag
    metrics_dict_test[aerosol] = generate_metrics_dic(
  File "/lcrc/soft/climate/e3sm-unified/base/envs/e3sm_unified_1.10.0_chrysalis/lib/python3.10/site-packages/e3sm_diags/driver/aerosol_budget_driver.py", line 82, in generate_metrics_d\
ic
    elvemis = data.get_climo_variable(f"{aerosol}_CLXF", season)
  File "/lcrc/soft/climate/e3sm-unified/base/envs/e3sm_unified_1.10.0_chrysalis/lib/python3.10/site-packages/e3sm_diags/driver/utils/dataset.py", line 161, in get_climo_variable
    variables = self._get_climo_var(filename, *args, **kwargs)
  File "/lcrc/soft/climate/e3sm-unified/base/envs/e3sm_unified_1.10.0_chrysalis/lib/python3.10/site-packages/e3sm_diags/driver/utils/dataset.py", line 386, in _get_climo_var
    derived_var = func(*variables)
  File "/lcrc/soft/climate/e3sm-unified/base/envs/e3sm_unified_1.10.0_chrysalis/lib/python3.10/site-packages/e3sm_diags/derivations/acme.py", line 1654, in <lambda>
    (("bc_a?_CLXF",), lambda *x: molec_convert_units(sum(x), 12.0)),
  File "/lcrc/soft/climate/e3sm-unified/base/envs/e3sm_unified_1.10.0_chrysalis/lib/python3.10/site-packages/e3sm_diags/derivations/acme.py", line 175, in molec_convert_units
    if var.units == "molec/cm2/s":
AttributeError: 'int' object has no attribute 'units'

Anything else we need to know?

No response

Environment

e3sm_unified_1.10.0