simulate idealized squall line or supercell using MPAS

[dy_008]

Hello, I tried to explore the idealized cases of squall line and supercell on MPAS. The tutorial suggests me to download the default domain, which contains a grid.nc with periodic lateral BCs. I hope to change the domain size with a different grid spacing, and also modify the sounding (both thermodynamic and U V wind). How am I supposed to do it? I tried to modify mpas_init_atm_cases.F, but the info is really limited. I can only modify the model heights and level distributions. What is the reference sounding?

Thanks,
Yi

 

[Ming Chen]

Hi Yi,

The MPAS mesh generation is a complicated process (see https://www2.mmm.ucar.edu/projects/mpas/tutorial/Virtual2023/lectures/Mesh_generation.pdf).
Currently, the meshes for ideal cases are pre-generated and users need to stay with these meshes. If you need a different mesh with different grid resolution, you will have to follow the instruction shown in the above document to create your mesh.

For the input sounding, MPAS ideal cases are different to WRF ideal cases in that, the sounding information is hardcoded in MPAS. Details can be found in the code "mpas_init_atm_cases.F". You need to modify this code to change the sounding information.

Unfortunately we don't support new mesh generation to meet individual user's need.

 

[dy_008]

Hi Yi,

The MPAS mesh generation is a complicated process (see https://www2.mmm.ucar.edu/projects/mpas/tutorial/Virtual2023/lectures/Mesh_generation.pdf).
Currently, the meshes for ideal cases are pre-generated and users need to stay with these meshes. If you need a different mesh with different grid resolution, you will have to follow the instruction shown in the above document to create your mesh.

For the input sounding, MPAS ideal cases are different to WRF ideal cases in that, the sounding information is hardcoded in MPAS. Details can be found in the code "mpas_init_atm_cases.F". You need to modify this code to change the sounding information.

Unfortunately we don't support new mesh generation to meet individual user's need.

It is fine. I just need to know the info of the mesh. For example, what is the domain size and horizontal resolution of the squall line/supercell cases? What is the default sounding details (Z,T,Q,U,V)? Those info will be super helpful for me or maybe other users to evaluate the idealized cases.

Best,
Yi

 

[Ming Chen]

Hi Yi,
The supercell ideal case is conducted over approximately 84x84 km domain.
There are156 cells in y direction and 180 cells in x direction. The mesh resolution is around 0.46667km.

As I mentioned previously, there is no input sounding for this case. The sounding data is hardwired in the code "mpas_init_atm_cases.F". You can print out the information you need when running this ideal case.

 

[dy_008]

Hi Yi,
The supercell ideal case is conducted over approximately 84x84 km domain.
There are156 cells in y direction and 180 cells in x direction. The mesh resolution is around 0.46667km.

As I mentioned previously, there is no input sounding for this case. The sounding data is hardwired in the code "mpas_init_atm_cases.F". You can print out the information you need when running this ideal case.

Thank you Ming!

Yi