SOA photolysis rate in CMAQ

CMAQ Chemistry and Aerosols
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Hi,

Is SOA photolysis considered in CMAQ (for example, CMAQ 5.3.2)? I tried to dig into the source code and look for signs. But I did not find any signs of SOA photolysis except SOA oligomerization. I want to make sure about this.

Thanks
Ling

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Hi Ling,

Can you look at this post.

https://forum.cmascenter.org/t/about-soa-species-in-cmaq-v5-3/3858/4

Also you can refer this article

https://gmd.copernicus.org/preprints/gmd-2020-345/gmd-2020-345.pdf

I also suggest you can also contact @ben_murphy for more clarification.

Also you may look at third bullet point in the link below.

https://github.com/USEPA/CMAQ/wiki/CMAQv5.4-Series-FAQ#chemistry

Manish

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Hi Manish,

Thank you for the reply! However, I still haven’t found any clues on SOA photolysis in CMAQ.

Thanks
Ling

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Hello,
You can find the peer-reviewed references for CMAQ’s SOA treatment here: How to Cite CMAQ | US EPA

Photolysis of SOA is not considered in CMAQ. Oligomerization is not modulated by photolysis and is a condensed phase process. Photolysis of SOA has been implemented in work that is under review (Vannucci et al.) and is under consideration for operationalizing in CRACMM3. The work by my student (Vannucci et al.) could be published in the next 2-3 months.

Havala

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