What does xyL * mean in HEMCO_Cnfig.rc?

[helpyuan]

Your name

liumy

Your affiliation

CAMS

Please provide a clear and concise description of your question or discussion topic.

Hi all,

I want to use the CEDS01 emission inventory for fullchem simulation, and I found the relevant HEMCO_Config.rc file on the webpage (http://geoschemdata.wustl.edu/ExtData/HEMCO/CEDS/v2024-06/config/HEMCO_Config.rc).

Firstly, I would like to confirm if the version of CEDS01 v2024-06 is available? Because I found that this version seems to be consistent with the content of v2023-04. (http://geoschemdata.wustl.edu/ExtData/HEMCO/CEDS/)

Secondly, there is a variable xyL* in the srcDim file of HEMCO_Config.rc. I learned from the manual that xy represents horizontal data and L represents data that can be applied to vertical coordinates. Does * mean it applies to all vertical layers? That is, L* represents the emission of a 2D field to all vertical layers. I don't know if my understanding is correct.

I will be grateful for any help.

[yantosca]

Thanks for writing. We have a description of this feature under SrcDim at this ReadTheDocs page:

• https://hemco.readthedocs.io/en/stable/hco-ref-guide/hemco-config.html#base-emissions

[helpyuan]

Thanks @yantosca. I have reviewed this document and I would like to confirm if * represents the entire vertical layer?

[yantosca]

@helpyuan: Thanks for the followup question. So xyL* is used for the vertical allocation of emissions (such as CEDS). From the code:

             ! Wildcard tells HEMCO to emit same value to all emission levels
             ! A scale factor should be applied to distribute the emissions
             ! vertically

I think this info may not have made it onto ReadTheDocs. We'll try to push a fix for that.

[yantosca]

@helpyuan: Also the CEDS emissions are going to be updated. There was a problem with the original data, which now has been resovled. We will bring this into 14.5.0.

[helpyuan]

Thanks @yantosca! So now CEDS data is not recommended for use? Or which version of CEDS data should I use in this directory (http://geoschemdata.wustl.edu/ExtData/HEMCO/CEDS/)?

[yantosca]

Thanks @helpyuan. You should use the current CEDS (HEMCO/CEDS/v2023-04 until further notice.

[helpyuan]

Thanks @yantosca! I think all my problems have been solved.