Specified dynamics scheme impacts on wave-mean flow dynamics, convection, and tracer transport in CESM2 (WACCM6)

Davis, Nicholas A.; Callaghan, Patrick; Simpson, Isla R.; Tilmes, Simone

doi:https://doi.org/10.5194/acp-22-197-2022

Articles | Volume 22, issue 1

https://doi.org/10.5194/acp-22-197-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-22-197-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 22, issue 1

Research article

|

07 Jan 2022

Research article |

| 07 Jan 2022

Specified dynamics scheme impacts on wave-mean flow dynamics, convection, and tracer transport in CESM2 (WACCM6)

Nicholas A. Davis, Patrick Callaghan, Isla R. Simpson, and Simone Tilmes

Supplement

https://doi.org/10.5194/acp-22-197-2022-supplement

Data sets

CESM2-WACCM6 specified dynamics sensitivity tests Data set N. A. Davis https://doi.org/10.5281/zenodo.4546650

NASA GEOS FP C. D. James https://portal.nccs.nasa.gov/datashare/gmao/geos-fp/das/Y2018/

Model code and software

Source code modifications for CESM 2.0: Online TEM diagnostics N. A. Davis https://doi.org/10.5281/zenodo.4470070

The Community Earth System Model NCAR https://github.com/ESCOMP/cesm

CAM6.3 User’s Guide NCAR https://ncar.github.io/CAM/doc/build/html/users_guide/index.html

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Short summary

Specified dynamics schemes attempt to constrain the atmospheric circulation in a climate model to isolate the role of transport in chemical variability, evaluate model physics, and interpret field campaign observations. We show that the specified dynamics scheme in CESM2 erroneously suppresses convection and induces circulation errors that project onto errors in tracers, even using the most optimal settings. Development of a more sophisticated scheme is necessary for future progress.