How does YSU PBL scheme work above PBL height?

[optism]

Hello, the YSU PBL scheme has the diffusivity coefficient Km scaling with (1 - z/h_pbl) where h_pbl is the diagnosed boundary layer height. What happens when z > h_pbl, say for shallow boundary layers? How is turbulent mixing modeled above the boundary layer?

Thanks!

 

[Ming Chen]

Please take a look at this paper:
Hong, Song–You, Yign Noh, Jimy Dudhia, 2006: A new vertical diffusion package with an explicit treatment of entrainment processes. Mon. Wea. Rev., 134, 2318–2341. doi:10.1175/MWR3199.1
Hope you can find helpful information in it.