Namelist Variable Questions

[mborrus]

Hi there -

The variable n_sponge is set to 0 by default, which would suggest there is no sponge layer. This doesn't seem correct: there should be some sponge layer, but I'm not sure where it's defined. Should I assume the sponge layer extends down to 8 hPa like in Zhao et al. 2018?

To introduce small perturbations to our initial conditions, I used the variable add_noise. I was wondering at which vertical levels is thermal noise added? Is it only to the lowest levels, or is it to all levels?

Thanks for any help,
Marshall

[thomas-robinson]

n_sponge is described in the FV3 documentation that is within the authoritative repository (GitHub:NOAA-GFDL/GFDL_atmos_cubed_sphere), PDF file in the docs directory.

add_noise is described in the fv_arrays.F90 file where the namelists are defined. n_sponge also has a short description there as well. The add_noise variable is used in fv_restart on every point.