How can I keep the initial input_sounding profile fixed during an ideal simulation (em_seabreeze2d_x)?

[kaee]

Hello.


I am running an ideal WRF case (em_seabreeze2d_x).


I understand that ideal.exe only generates the initial condition (wrfinput_d01) from input_sounding, and afterwards wrf.exe evolves the atmosphere normally.


My goal is not to change the initial sounding. Instead, I want to keep the initial vertical sounding (temperature and/or wind profile) fixed during the entire simulation, so that it does not evolve with time.


I found some old discussions suggesting that solve_em.F should be modified, but I am not sure where this should be done or whether solve_em.F is really the correct place.


Has anyone implemented something similar?

• Is solve_em.F the correct file to modify?
• Or should the restoring be implemented somewhere else (e.g., RK update routines, physics routines, or another module)?

Any suggestions or examples would be greatly appreciated.


Thank you.

 

[Ming Chen]

I am not sure I completely understand your question. The ideal case of em_seabreeze2d_x runs with full-physics and uses periodic lateral boundary. The input sounding has no wind. It only provides initial condition. Once the model starts, all variables are updated by WRF phsyics/dynamics.

 

[kaee]

I am not sure I completely understand your question. The ideal case of em_seabreeze2d_x runs with full-physics and uses periodic lateral boundary. The input sounding has no wind. It only provides initial condition. Once the model starts, all variables are updated by WRF phsyics/dynamics.

Thank you. I think I understand your explanation. If I understand correctly, input_sounding is used only to generate the initial condition, and it is not referenced again during the simulation.

In that case, if I want to keep some variables from the initial sounding (for example, the upper-level wind or potential temperature profile) close to their initial values, is modifying solve_em.F essentially the only approach? Or is there another part of the WRF code that would be more appropriate?