E3SM-Project / E3SM-Project/v3atm

Enable Mass_xx output when `history_verbose` is on and update Mass_so4 with strat sulfate

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Description

Based on an email thread with @crterai @mingxuan @hwangacme @tangq,

Aerosol modelers often set history_aerosol = True and history_verbose = True to switch on the detailed aerosol diagnostics for analysis. This will add many output fields and increase the data volume. In production runs, history_verbose is often turned off.

In current [code](https://github.com/E3SM-Project/v3atm/blob/c5f8b378c9b4cc8e676df92326e15c2a9902dfdf/components/eam/src/chemistry/mozart/mo_chm_diags.F90#L303) , turning on `history_verbose` would remove output for total concentrations of aerosol species (e.g., Mass_so4), which are required for computing aerosol budget in E3SM Diags. Enable Mass_xx output when `history_verbose` is on would allow using E3SM Diags's aerosol budget tables for development version from specialized aerosol focused runs. @mingxuanwupnnl also noted that we will need to modify the code to get correct Mass_xx fields for v3, as we add strat sulfate so4_a5/so4_c5.

Contributor guide

Open the contributing guide

Research direction

Start at components/eam/src/chemistry/mozart/mo_chm_diags.F90 around the linked history_verbose logic. Trace how Mass_xx fields, especially Mass_so4, are selected when history_aerosol and history_verbose are enabled, including so4_a5 and so4_c5. Done means detailed aerosol runs retain total aerosol concentration outputs with values suitable for E3SM Diags aerosol budget tables.

Written by the indexing model from the issue text.

Assessment

Tech stack
fortran
Domain
data
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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