Assistance running HEMCO Standalone online SoilNOx

[tanksnr]

Name and Institution (Required)

Name: Mogesh Naidoo Institution: CSIR

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• [x ] Support guidelines
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• [x ] Debugging GEOS-Chem and HEMCO errors
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Description of your issue or question

Hi everyone,

I am running HEMCO Standalone 3.7.1. I am attempting to run the online SoilNOx extension (104) using input data downloaded from: http://ftp.as.harvard.edu/gcgrid/data/ExtData/HEMCO/SOILNOX/v2014-07/ This includes the land-cover, fertilizer and default deposition reservoir. I also include MERRA-2 input.

The error I'm getting is:

HEMCO ERROR: Cannot fill extension field DRY_TOTN
 --> LOCATION: ExtDat_Set_2R (hcox_state_mod.F90)

HEMCO ERROR: Cannot fill extension field WET_TOTN
 --> LOCATION: ExtDat_Set_2R (hcox_state_mod.F90)

HEMCO ERROR: DRYCOEFF not defined

To me this looks like the extension requires dry and wet deposition from a host atmospheric model. I do provide input of "DEP_RESERVOIR", and from the log it looks like the field is being filled. Does the DEP_RESERVOIR_DEFAULT data not replace the DRY_TOTN and WET_TOTN fields? Or do I absolutely need to run GEOS-Chem to make use of the online soilnox extension? I'm also not sure where to define DRYCOEFF.

I'm attaching the config and log files here:

HEMCO_Config.rc.txt HEMCO_current.log HEMCO_Diagn.rc.txt HEMCO_sa_0.6x0.6-RSA_Grid.rc.txt HEMCO_sa_Config.rc.txt HEMCO_sa_Time.rc.txt

[yantosca]

Thanks for writing @tanksnr. Have you tried commenting out the entries for DRY_TOTN and WET_TOTN in HEMCO_Config.rc? Those fields are for passing deposited nitrogen from the GEOS-Chem model to the extension. You can also comment out entries for other similar fields.

You can certainly also try to run a a GEOS-Chem simulation. If you turn off chemistry and transport then it should go faster than with those operations turned on.

[yantosca]

Also DRYCOEFF is read in as part of the GEOS-Chem dry deposition module.

[tanksnr]

Thanks for writing @tanksnr. Have you tried commenting out the entries for DRY_TOTN and WET_TOTN in HEMCO_Config.rc? Those fields are for passing deposited nitrogen from the GEOS-Chem model to the extension. You can also comment out entries for other similar fields.

You can certainly also try to run a a GEOS-Chem simulation. If you turn off chemistry and transport then it should go faster than with those operations turned on.

Thank you for having a look. There are no entries for DRY_TOTN or WET_TOTN in my HEMCO_Config.rc file. I would have thought the DEP_RESERVOIR variable can be used to replace those? I'll investigate further in the soilnox extension code but it does look that way from the outset.

For DRYCOEFF, it looks like I can read them in within HEMCO_Config.rc manually or from a netcdf Olson_1992_Drydep_inputs.nc.

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