4 Nest SimulationΒΆ

The following scripts are provided by the author for running a one-way nesting WRF-CTSM simulation. This is suitable for high-resolution WRF-CTSM simulations. As described in Using CTSM with WRF (Nested Model Runs), one-way nesting means that boundary conditions are passed from the outer (parent) domain to the inner (child) domain, but not vice versa.

In a case of 4 nested domains, we run a WRF simulation for the outer 3 domains (i.e., d01, d02, d03) as dynamic downscaling, and then run a WRF-CTSM simulation for the innermost domain (i.e., d04). The workflow is:

  • Run WPS for all domains

    • Get met_em.d0*, geo_em.d0*

  • Run WRF for d01, d02, and d03 as dynamic downscaling

    • Get wrfout_d03_*

  • Run real.exe for d03 and d04

    • Rename met_em.d03.*.nc as met_em.d01.*.nc and rename met_em.d04.*.nc as met_em.d02.*.nc for running real.exe (here, the original d03 is the outer domain and the original d04 is the inner domain)

    • Get wrfinput_d02

  • Run ndown.exe for d04

    • To extract data from wrfout_d03_* as input for the inner domain

    • Rename wrfinput_d02 as wrfndi_d02 for running ndown.exe

    • Get wrfinput_d02 and wrfbdy_d02

  • Run WRF-CTSM for d04 (single domain)

    • Generate CTSM surface data based on geo_em.d04

    • Rename wrfinput_d02 as wrfinput_d01 and rename wrfbdy_d02 as wrfbdy_d01.

Please refer to the official tutorials for using ndown.exe: