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GEOS-Chem "Science Codebase" repository. Contains GEOS-Chem science routines, run directory generation scripts, and interface code. This repository is used as a submodule within the GCClassic and GCHP wrappers, as well as in other modeling contexts (external ESMs).
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HEMCO_diagnostic.nc - Question regaridng MOH biogenic emission #2189

Closed laura-hyesung-yang closed 7 months ago

laura-hyesung-yang commented 8 months ago

Name: Laura Yang Institution: Harvard University Model version: 14.3.0

May I ask a question regarding the HEMCO_diagnostic.nc file? I'm trying to see what EmisMOH_Biogenic looks like in this file. When I plot the June 2016 monthly HEMCO_diagnostic file EmisMOH_Biogenic, it shows MOH biogenic emission is 0. Screenshot 2024-03-08 at 1 54 15 PM

In my HEMCO_Config.rc file, I have offline biogenic VOC emission on. --> OFFLINE_BIOGENICVOC : true # 1980-2020

The online biogenic VOC emission is also on but to my knowledge, if the species exist in OFFLINE biogenic VOC, online MEGAN computation doesn't get used. 108 MEGAN : on ISOP/ACET/PRPE/C2H4/ALD2/MOH/EOH/MTPA/MTPO/LIMO/SESQ/SOAP/SOAS

The MOH biogenic source is read from the directory shown below: 0 BIOGENIC_MOH $ROOT/OFFLINE_BIOVOC/v2021-12/0.5x0.625/$YYYY/$MM/biovoc_05.$YYYY$MM$DD.nc MOH_MEGAN 1980-2022/1-12/1-31/* EFY xy kg/m2/s MOH - 4 2

When I checked the input file, I found that the emission is not zero for MOH (example from biovoc_05.20160601.nc file).

Screenshot 2024-03-08 at 1 52 58 PM

Other biogenic species specified under OFFLINE_BIOGENICVOC show emission in HEMCO_diagnostic.nc file. I wonder why only MOH shows 0 emissions in the file. Is category 4 the correct one for biogenic sources? I'd greatly appreciate your insight on this matter. Thank you!

yantosca commented 8 months ago

Hi @laura-hyesung-yang, thanks for writing. I think the issue may be that you have the wrong extension number for EmisMOH_Biogenic in your HEMCO_Diagn.rc file. By default this should be set to 108 (extension number for MEGAN), but if you switch to use the offline emissions you will need to change that to 0 (extension number for base emissions).

laura-hyesung-yang commented 8 months ago

@yantosca Hi Bob! Thank you for your prompt response. I checked HEMCO_Diagn.rc file and indeed EmisMOH_Biogenic has an extension number of 108. I will try to run the model with extension number of 0 instead and close this issue if that fixes what I see on HEMCO_diagnostic.nc!

yantosca commented 8 months ago

Thanks @laura-hyesung-yang. Also don't forget to change the extension number to 0 in HEMCO_Diagn.rc for all of the other biogenic diagnostic species that you need to save out. Ditto for the other offline emissions such as biomass, etc.

laura-hyesung-yang commented 8 months ago

@yantosca Actually all the other biogenic species except for MOH have an extension number of 0 in HEMCO_Diagn.rc. It makes sense why I only had 0 emissions for EmisMOH_Biogenic in the HEMCO_diagnostic.nc file!