[Ncep.list.fv3-announce] NEMSfv3gfs and FV3 git repository updates 20180417

[Jun Wang - NOAA Federal]

Dear all,

Following changes were committed to the NEMSfv3gfs and FV3 repositories:

Task #48158 <https://vlab.ncep.noaa.gov/redmine/issues/48158>: merge fv3
coupling branch back to fv3 git repo

This is the first step to set up coupled system using fv3 as atmosphere
grid component. Following code changes are added:

1) Update integration loop to allow time sequencing in coupled mode so that
atmosphere comp can come out integration at coupling frequency and come
back from coupling to continue integration.
2) The coupled fields required by the coupled system (fv3-mom-cice and
fv3-ww3) are set up. This includes import fields to atmosphere and export
fields that atmosphere provides to other components: currently ocean, wave
and sea ice. A model configuration variable "cpl" is added in
model_configure, when it is set to .true., the model is running on coupled
model, when it is .false., the model is running on standalone mode.
3) New capability to write out vtk files on fv3 grid and to dump out
coupled fields from fv3 is added. A logical variable "cplprint_flag" is set
to control the debug prints when model runs in coupled mode.
"cplprint_flag" will be set to true when the "dumpField" attribute is set
to true and then the VTK files and coupled fields will be written out in
FV3.
4) The land sea mask is added to fv3 forecast grid, it will be used for
regridding flux fields in coupled system.

The branch was tested in some coupled apps. The plan is to test it in
standalone mode and commit the code to the fv3 git repo first. The Coupled
apps will bring up their fv3 branches to this master version while merging
corresponding changes in other components.

Above code changes have no impact on NEMSfv3gfs baseline. The code passed
regression test for standalone fv3 app NEMSfv3gfs.

Thanks.

Jun
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