[FEATURE REQUEST] Update incorrect PM2.5 definintion for complex SOA simulations

[yantosca]

Request a new GEOS-Chem feature

Colette Heald wrote:

The folks from Edinburgh below pointed out that the PM2.5 calculation described on the wiki doesn't seem to be up to date with the v12.6.0 removal of isoprene VBS from the SOA:
http://wiki.seas.harvard.edu/geos-chem/index.php/Particulate_matter_in_GEOS-Chem

Could you update that, and double check that the code reflects those changes as well?
...
In terms of definitions it's not clear whether OPOA should be POA or SOA. As Jeff says, there are measurement reasons to lump OPOA with SOA, but there are source reasons to do the opposite. We mention this on page of 4 of Pai et al. 2020 where we decided to classify OPOA as POA rather than SOA, largely to be consistent with previous GEOS-Chem studies, especially Pye et al., 2010. You can also see this in Figure 1 of Pai et al. which describes the current complex and simple scheme implemented in GEOS-Chem. That figure is now up on the wiki for SOA: http://wiki.seas.harvard.edu/geos-chem/index.php/Secondary_organic_aerosols

Note that on the wiki link above, the removal of VBS isoprene SOA in v12.6.0 is also discussed. We will follow up with the Support Team to make sure that the PM2.5 calculation is similarly described (for the removal of VBS isoprene SOA).

[yantosca]

We will add this as a patch in 12.9.2, as this will not affect the Standard or Benchmark simulations.

[yantosca]

This issue is now resolved by commit 91e6814.

This update was supplied by Maggie Marvin.