Capability to output changes of tracer fields due to chemical processes

[KaiWang-NOAA]

This is for the AI/ML emulator for chemistry. We need the capability to output chemical tracers before and after different chemical processes to generate the training data.

A preliminary code modification has been attempted in the GFS-CMAQ legacy model (will put the similar change to the UFS-CMAQ later if UFS-CMAQ is desired) to write the RESTART files every 30-min for tracers before and after the AQM step. However this modification is not optimal since the outputs account for all the processes in the AQM component including not only the gas/aerosol chemistry but also emissions and dry depositions etc. A new feature needs to be developed in order to exclude those non-chemistry related processes.

[BrianCurtis-NOAA]

@KaiWang-NOAA is this something you want to be ready for what will be AQM v8 or sometime later than that?

[KaiWang-NOAA]

@BrianCurtis-NOAA @JianpingHuang-NOAA This issue is related to the AI project. We currently have a temporary solution, which is much less accurate than what the AI team actually needs. The capability with accurate treatments will need substantial code modifications and should be considered in AQMv8.

[bbakernoaa]

@KaiWang-NOAA @JianpingHuang-NOAA are we still targeting this as a potential update for AQMv8?