Does Real use parent domains for a late-started inner nest?

[jamesrup]

Hi WRF community,

I wasn't able to find an answer to this in the WRF user guide, though I suspect this information is out there somewhere...

My question is whether or not a WRF simulation with an inner domain started after the parent domain uses the parent domain to update/replace the initial condition for the inner nest. Real.exe generates the initial conditions for all grids, but I'm wondering if the inner-domain initial condition is replaced by information from the parent domain once it reaches the inner-domain start time.

Thanks all!

 

[Ming Chen]

If the child domain starts later than the parent domain, I would recommend that you set

input_from_file = .true., .false.,

In this case the initial condition for the child domain will be derived from the simulation of parent domain. This will keep the fields consistent between parent and child domain.

 

[jamesrup]

Amazing, thanks for the quick reply!

 

[jamesrup]

Hi Ming Chen, as a follow-up, when I run ndown.exe, do you know if the new wrfinput_d02 it produces is downscaled from d01, or if this is just information from the met_em files?

 

[Ming Chen]

wrfinput_d02 is from wrfout_d01, except that more detailed surface information (e.g., terrain height, landuse type, etc.) is included.

 

[jamesrup]

Okay, thanks very much for clarifying.