Introduction

This is a redesign and reimplementation of GAMIL dynamical core (shortly as dycore) developed in IAP/LASG. New dycore should be devised with the following considerations ordered by priority from high to low:

• Switch between hydrostatic and nonhydrostatic (e.g. hydrostatic-pressure coordinate)
• Better vertical coordinate (e.g. SLEVE)
• Nonhydrostatic (e.g. filter vertical acoustic wave or implicit solver)
• Deep atmosphere
• Good extendability

Currently, only a barotropic dycore is implemented, and we are working on a moving reduced tendency scheme to improve numerical stability around Poles.

Prerequistes

You should install the following software with proper version yourself:

• CMake
• NetCDF
• NCL

Usages

Obtain the codes by using git command:

$ git clone https://github.com/dongli/gamil-dycore --recursive

Build the model:

$ cd build
$ FC=gfortran cmake ..
$ make
$ cd ..

There should be dycore_test.exe file generated.

Run the Rossby-Haurwitz wave test:

$ cd run
$ ../build/dycore_test.exe namelist.rh_test
$ ls rh_test.360x181.dt240.h0.*.nc
$ ncl -Q ../src/test_cases/barotropic/plot_rossby_haurwitz_wave_test.ncl file_prefix=\"rh_test.360x181.dt240\"

You can modify the namelist file namelist.rh_test, such change the time step size. There should be rh_test.360x181.dt240.pdf file depending on your modification of the namelist file.

Run the mountain zonal flow test:

$ cd run
$ ../build/dycore_test.exe namelist.mz_test
$ ls mz_test.360x181.dt240.h0.*.nc
$ ncl -Q ../src/test_cases/barotropic/plot_mountain_zonal_flow_test.ncl file_prefix=\"mz_test.360x181.dt240\"

There should be mz_test.360x181.dt240.pdf.

Other test cases:

• jet_zonal_flow
• steady_geostrophic_flow

Authors

• Bin Wang
• Li Dong
• ...