[Ncep.list.fv3-announce] NEMSfv3gfs and FV3 git repository updates 20190606

Dusan Jovic dusan.jovic at noaa.gov
Thu Jun 6 18:38:12 UTC 2019


      NEMSfv3gfs and FV3 git repository updates 20190606
      <https://vlab.ncep.noaa.gov/redmine/news/780>


Following changes were committed to the NEMSfv3gfs repositories:

Ticket #64015 <https://vlab.ncep.noaa.gov/redmine/issues/64015>:

The TKE-EDMF is further updated:
1) the constant minimum mixing length (30m) is modified to decrease 
exponentially with height from 30m at surface, which helps to reduce the 
negative wind speed bias in upper troposphere.
2) the background diffusivity and the empirical coefficient for TKE 
dissipation are modified to decrease with increasing stability for 
stable layers.
3) the empirical coefficient of eddy diffusivities for scalar variables 
in free atmosphere is increased from 0.15 to 0.2.

When the new namelist variable for TKE-EDMF ('isatmedmf') is set to 1, 
the updated TKE-EDMF scheme ('satmedmfvdifq.f) is used. If isatmedmf=0, 
the initial version of TKE-EDMF ('satmedmfvdif.f') is used.

and ticket #62862 <https://vlab.ncep.noaa.gov/redmine/issues/62862> time 
checking in fv3_checkimport in fv3 cap

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