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geoschem / geos-chem

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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[QUESTION] How to assess Tropospheric Ozone concentration changing by CH4 #1294

Closed tjansakoo closed 1 year ago

tjansakoo commented 2 years ago

Hi, currently I'm interested to assess the impact of CH4 emission on ground surface ozone concentration. There is a possible way to assess it via GEOS-chem as I know GEOS-Chem assumes that CH4 emission on the surface layer is not changing right?

Thank you in advance.

stale[bot] commented 2 years ago

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msulprizio commented 1 year ago

The full-chemistry simulation in GEOS-Chem uses monthly mean surface methane distributions from NOAA GMD flask observations. These are read in via HEMCO:

https://github.com/geoschem/geos-chem/blob/7e51a0674aba638c8322fef493ac9251095e8cf4/run/GCClassic/HEMCO_Config.rc.templates/HEMCO_Config.rc.fullchem#L3413-L3418

See this wiki page for more details on those data: http://wiki.seas.harvard.edu/geos-chem/index.php/Tropospheric_chemistry_mechanism#CH4_concentrations.

We've had a few users inquire in the past about using CH4 emissions from the CH4 simulation in the full-chemistry simulation, but I'm not sure if anyone has attempted that. It would involve manually bringing in entries from HEMCO_Config.rc for the CH4 simulation into the HEMCO_Config.rc for your full-chemistry simulation. One thing to keep in mind is that the CH4 simulation uses archived OH concentrations from v5 of GEOS-Chem.

tjansakoo commented 1 year ago

Thank you so much I will check the HEMCO_Config.rc

yantosca commented 1 year ago

Closing out this issue for now.