A quick enhancement for clipping negative Q in the analysis of EnKF for fv3-lam #566
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TingLei-daprediction
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…oisture values in the analysis of EnKF for FV3-LAM
TingLei-daprediction
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…oisture values in the analysis of EnKF for FV3-LAM
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David and Chunhua, Could you please review Ting's changes? We want to implement the change in rrfs v0.5. |
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…oisture values in the analysis of EnKF for FV3-LAM
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…oisture values in the analysis of EnKF for FV3-LAM also remove the condition of l_use_enkf_directZDA=.true. for clipping of negative values for hydrometeors when cliptracers=.true.
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Resubmit PR for cleaning the unneeded item in the previous PR In correspondence to the EMC GSI Issue#566, this PR contains a quick adding of the clipping of negative values of sphum (q) in the analysis of FV3-LAM EnKF. This part of codes are not tested in the current GSI regression tests, which, hence, are not run. The current codes are verified using local FV3-LAM case. It is found the differences from this changes exist for sphum ( maximum values about 0.003 (units) and 0.3 K for T (sensible T). The latter is because the sphum would be used when the analysis TV is converted to T. All differences are on spontaneous points and values are reasonable as expected. Hence, the code is regarded as verified. Fixes #566 **DUE DATE for this PR is 6/15/2023.** If this PR is not merged into `develop` by this date, the PR will be closed and returned to the developer.
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In the current FV3-LAM EnKF, negative values in the hydrometers wold be replaced with the minimum positive values available in the running of this program. But this clipping is not applied to the moisture (sphum ). The negative values would cause issues for the following modeling/forecast if the model wouldn't use clipping on its' own, that is the case found by @JiliDong-NOAA
Hence, a quick adding of such clipping for sphum (q) in the fv3-lam EnKF is to be done.
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