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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 about simulation output #1859

Closed Fearlessssssss closed 1 year ago

Fearlessssssss commented 1 year ago

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Name:Tyler Institution:THU

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Hi, everyone. I wonder where can I get the output of CCN concentration or number concentrations of particles? I haven't seen the related collections in HISTORY.rc. Is it Ok to get the output of these fields directly?

yantosca commented 1 year ago

Thanks for writing @Fearlessssssss. I believe that you would need to run one of the microphysics simulations (either APM or TOMAS) to be able to save out CCN. You might want to contact the Aerosols Working Group for further guidance. Tagging @theloniuspunk @bettycroft

theloniuspunk commented 1 year ago

Hi Tyler, this is Jeff Pierce. If you run with TOMAS, you can calculate CCN offline from the output (number and composition in each size bin). You can also calculate CCN offline from the standard aerosol scheme, but you need to assume a size distribution for each species (some assumptions on how to do that are here: https://doi.org/10.1002/2016JD025886). As far as I know CCN are not calculated online for any run option (perhaps they are for the APM scheme).

Fearlessssssss commented 1 year ago

Got it, thanks a lot!