Add options to tune weights of mixed ensemble for FV3-LAM EnVar #538
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shoyokota
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Feb 21, 2023
…le for FV3-LAM EnVar
ShunLiu-NOAA
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…V3-LAM EnVar (#541) This PR adds options (weight_ens_gfs and weight_ens_fv3sar) to tune weights of mixed ensemble for FV3-LAM EnVar (#538). Regression tests for global 3dvar/4denvar/4dvar are not completed yet, but for other tests, issues are not found except for "failed the scalability test" and "exceeded maximum allowable hardware memory limit" on Orion. Fixes #538 Co-authored-by: Sho Yokota <syokota@Orion-login-1.HPC.MsState.Edu>
TingLei-daprediction
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…le for FV3-LAM EnVar (NOAA-EMC#541) This PR adds options (weight_ens_gfs and weight_ens_fv3sar) to tune weights of mixed ensemble for FV3-LAM EnVar (NOAA-EMC#538). Regression tests for global 3dvar/4denvar/4dvar are not completed yet, but for other tests, issues are not found except for "failed the scalability test" and "exceeded maximum allowable hardware memory limit" on Orion. Fixes NOAA-EMC#538 Co-authored-by: Sho Yokota <syokota@Orion-login-1.HPC.MsState.Edu>
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In #451, mixed ensemble (using global and regional ensembles simultaneously) options were introduced. However, weight of each ensemble was fixed to one, so background error covariances created by these summation were overestimated compared to only using global or regional ensembles. Here, the following options are introduced to tune weights of mixed ensembles. Setting in weight_ens_gfs+weight_ens_fv3sar=1 is preferable, but not necessary.
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