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Two alternative ocean surface flux schemes are implemented in E3SM in order to better simulate the heat and moisture fluxes over the ocean.Contributors: Kai Zhang, Jack Reeves Eyre (Unlicensed)
Algorithmic Formulations
The first scheme is the COAREv3.0 scheme that is based on Fairall et al (2003). This scheme was previously implemented in NorESM and it showed positive impacts on the climate. The second scheme is the UA flux scheme that is based on Zeng et al. (
to be completed). Jack Reeves Eyre (Unlicensed), since you have a good slide that compares the default scheme and the two new schemes, could you please add it here?Design and Implementation
PR for COAREv3.01998). See slide 1 in PowerPoint below for summary table.
Design and Implementation
Text below is copied from Jack's page.
PR: https://github.com/E3SM-Project/E3SM/tree/jackreeveseyre/cime/alternate_surface_flux
- Default scheme (ocn_surface_flux_scheme = 0)
- COARE (ocn_surface_flux_scheme = 1)
- UA scheme (ocn_surface_flux_scheme = 2)
To turn on the UA scheme add the following to user_nl_cpl:
ocn_surface_flux_scheme = 2 |
or add to your run script:
cd $CASEROOTcat << EOF >> user_nl_cpl ocn_surface_flux_scheme = 2EOF |
This flag defaults to 0 (E3SMv1 scheme; Large and Pond etc.) and can also take value 1 (COARE v3.0).
Verification and Unit Testing
Validation
atmosphereAtmosphere-only (5yr) simulations were performed and evaluated against observation. details Details can be found at:
/wiki/spaces/EWCG/pages/942342153
/wiki/spaces/EWCG/pages/976519868
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Performance Testing
No significant changes in model performance.