[Ncep.list.fv3-announce] NEMSfv3gfs and FV3 git repository updates 20180428

Jun Wang - NOAA Federal jun.wang at noaa.gov
Fri Apr 27 13:21:31 UTC 2018


Dear all,

Following changes were committed to the NEMSfv3gfs and FV3 repositories:

Task #49401 <https://vlab.ncep.noaa.gov/redmine/issues/49401>: Advanced
physics update to fv3gfs - add MG3, fix some bugs in MG2 and vertical
diffusion in shoc

This ticket is on adding updated version of latest MG3 microphysics from
NCAR. The code has been modified to make it more efficient including
quasi-implicit treatment of sedimentation.

1. The updated version can be run as either MG2 or MG3 via namelist
options. The differences between MG2 and MG3 is that MG3 includes
prognostic graupel and it's number concentration.

2. While installing MG3 and optimizing a bug was found in the optimized MG2
version (which is in the master now) which is now fixed.

3. A bug in the vertical diffusion of TKE in shoc is also fixed. Some
tunable parameters for shoc is now exposed to the namelist as well as some
parameters for MG3. The microphysics driver is optimized to reduce memory
by eliminating unnecessary arrays.

4. For shoc an option following Scipion et. al. is added for TKE
dissipation near the lower boundary.

5. In this version of the code the word "INPUT/" is removed from the file
name in "ozinterp.f90" and "h2ointerp.f90". With this change to the code
the ozone and h2o forcing file needs to be in the "RUN" directory, outside
of the "INPUT" directory. Additional namelist parameters are added (related
to SHOC and MG) to the physics namelist. To run MG3 or "MG3 as MG2" or the
original MG2/MG1, proper namelist and field_table needs to be used. Some
examples can be seen in the additional regression tests.

6. The IO routine "module_wrt_grid_comp.F90" has been modified to set up
file names for all time ((including every time step and forecast hours
beyond 999 hours). The code has been tested by running up to 1080 hours (45
days).

Regression test scripts are modified to handle the o3 and h2o input file
directory change. A new regression test, csawmg3sho127, with C96 127
vertical layers is added and currently runs on cray and theia. The above
code changes do not alter baseline results except the cs/mg/shoc regression
tests.
Thanks!


Jun
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://www.lstsrv.ncep.noaa.gov/pipermail/ncep.list.fv3-announce/attachments/20180427/da032b1b/attachment.html 


More information about the Ncep.list.fv3-announce mailing list