About setting MEGAN in HEMCO_Config.rc file

[yangning-code]

Your name

Ning Yang

Your affiliation

JNU

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

I am using GEOS-Chem to simulate pollutants for 2023, but I want to use the online MEGAN emissions for 2013. How should I set it up to achieve this?

[msulprizio]

Hi @yangning-code. You can simply set the following in HEMCO_Config.rc:

--> OFFLINE_BIOGENICVOC    : false

and

108     MEGAN              : on

If you would like to utilize the biogenic emissions output diagnostic, you will also need to modify all Biogenic entries in HEMCO_Diagn.rc to use ExtNr Cat of 108 -1 (to get the field from the MEGAN extention 108) instead of 0 4 (to get the field from the base emissions).