Enable tapering of atm ensemble spread at the model top #3096
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CatherineThomas-NOAA
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Evaluation of the impact of the tapering can be found here. Two rounds of evaluation were performed, both before and after the GWD changes were included for HR4. |
CatherineThomas-NOAA
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Nov 13, 2024
This commit turns on the tapering of atmospheric ensemble perturbations at the model top in the EnKF to reduce the upper layer ensemble spread. This commit also includes a minor update of changing the IC tag date for the staged HR4 ICs. Resolves NOAA-EMC#3096
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WalterKolczynski-NOAA
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Nov 22, 2024
This commit turns on the tapering of atmospheric ensemble perturbations at the model top in the EnKF to reduce the upper layer ensemble spread. Resolves NOAA-EMC#3096 --------- Co-authored-by: Rahul Mahajan <aerorahul@users.noreply.github.com>
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What new functionality do you need?
The GSI EnKF was previously updated to allow for the tapering of the ensemble spread towards the model top. The needed update would turn on that feature by default for GFSv17.
What are the requirements for the new functionality?
When GFS experiments are run with the global workflow, the atmospheric ensemble perturbations should be reduced towards the model top automatically using the
taperanalpertsnamelist variable in the EnKF.Acceptance Criteria
taperanalperts=.true.in the GSI EnKF namelist and runs without failureSuggest a solution (optional)
A PR will be opened to include the new variable in the config.eupd file as well as the update needed for the ex script to read and pass on the new variable.
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