search

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).
http://geos-chem.org
Other
168 stars 165 forks source link

[FEATURE REQUEST] Reinstate Iy sink reactions on alkaline sea salt aerosol and remove IONO2 recycling on alkaline sea salt aerosol #1585

Closed beckyalexander closed 1 year ago

beckyalexander commented 1 year ago

Request a new GEOS-Chem feature:

Prior to 13.3, uptake of HOI, HONO, and IONO2 on alkaline sea salt aerosol formed ISALA and ISALC. This was removed in 13.3. Also in 13.3, IONO2 recyling on alkaline sea salt aerosol was added. This has contributed to the decrease in ozone in the model.

I've reinstated the sink reactions and removed the IONO2 recycling reaction. This, along with the sea salt alkalinity bug fixes (here and here), brings ozone back to previous model versions when sea salt debromination is turned on.

These sink reactions may not be real and may serve as a straw man for missing Iy sinks. I recommend putting these sink reactions back in so that we can run the model with sea salt debromination turned on.

I've included a plot comparing this model version and two others with surface ozone observations. I've also included a patch file for this change. The model version for the patch file is 13.4.1 and was run with the above-mentioned bug fixes, this patch, and sea salt debromination turned on.

surface.O3.geos.pdf hetIy-patch-file.txt

yantosca commented 1 year ago

Thanks @beckyalexander, I can make a PR from the patch file. This can go into 14,2.0, as we are currently wrapping up 14.1.0.

msulprizio commented 1 year ago

The corresponding PR (#1620) has now been merged into the 14.2.0 development branch.