[Wrf-users] Unrealistic PBL heights when using CLM as compared to NOAH

[Jatin Kala]

Hi all,
We ran WRF simulations (3.8.1) which are identical, except for the LSM choice, i.e., NOAH versus CLM.
While the simulation using NOAH look very reasonable, the one using CLM looks rather strange.

CLM_PBLH_ncview.png shows PBL heights of about 900 m within the relaxation zone, but about 100-200 m inside.
While i always expect some discontinuity within the relaxation zone, this looks spurious.

NOAH_PBLH_ncview.png shows PBL heights at the same output time, and we do not have this issue.

The same thing issue reflected in the sensible heat flux (HFX) outputs (also attached).
CLM_HFX_ncview.png shows higher sensible heat flux over inland water points as compared to the land points.....
NOAH_HFX_ncview.png shows near zero sensible heat flux over the inland water points, and much higher over land points, which makes a lot more sense.

When i look at SWDOWN from the CLM outputs (CLM_SWDOWN_ncview.png attached), it's exactly zero across the domain, except over the inland water point where it is 600 Wm-2. How is this possible??

SWDOWN for NOAH looks fine (NOAH_SWDOWN_ncview.png attached).

Has anyone else experienced similar issues when using CLM in WRF? The namelists are attached, and the only difference is sf_surface_physics and num_soil_layers:

134:temp_CLM Jatin$ diff namelist.input_CLM ../temp_NOAH/namelist.input.NOAH
71c71
<  sf_surface_physics                  = 5,     5,     5,      5,
---
>  sf_surface_physics                  = 2,     2,     2,      2,
80c80
<  num_soil_layers                     = 10,
---
>  num_soil_layers                     = 4,

Both simulations are driven with Era-Interim. real.exe was run for each simulation separately, using the same met_em files.

tar files with all input and few output files can be downloaded from here if that's useful:

https://www.dropbox.com/s/nigy40p1pqb1sdz/CLM.tar?dl=0
https://www.dropbox.com/s/b1dfs3wum5ytb8p/NOAH.tar?dl=0

Thanks in advance,
Jatin


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