HEMCO CS flag for skipping new tracer species in restart file not working in GCHP, worked previously in Classic about gchp HOT 2 CLOSED

Hi @amy1916, thanks for reaching out about this. Some of the GEOS-Chem simulations require that all species be in the restart file, including the standard simulation. This was a new feature added recently per request of the GEOS-Chem Steering Committee to match the behavior of GEOS-Chem Classic. For GEOS-Chem Classic you can get around this by updating a flag in HEMCO_Config.rc, as you did. In GCHP that part of HEMCO_Config.rc is not used because the NASA MAPL library is used for data read instead. To configure your run to allow missing species in the restart file you instead need to flip a switch in config file setCommonRunSettings.sh. Search for string "Require_Species_in_Restart" in the file. If set to 1 it will require species, and if set to 0 it will not.

This question has come up a lot so I think we need to update our docs to be more clear about it. In the next version I will move the setting to higher in the config file so it is more visible. I will also update the GCHP Debugging page to specifically mention this issue to look for and how to fix it. We have this section of GCHP ReadTheDocs about this. Let me know if you have ideas beyond what I just listed to make it more clear.

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Hi @lizziel, thank you for the clarification. Sorry, I missed that in the GCHP ReadTheDocs, I was mainly looking at the 'Update chemical mechanisms with KPP' section. I think this is clear and will be great for the setting to be more visible in the config file. Thanks again for your help with this.

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