Rainfall highly overestimation over Africa

[rabbanidu93]

Dear concern,

I get (800 mm/day) highly overestimated rainfall (compared to observation) over the middle part of Africa for domain that covers Africa, Asia and Australia (picture attached) using a local assimilated GFS dataset. But I am getting same overestimation using raw NCEP GFS (0.25x0.25) dataset. I tried to find the reason by selecting a domain that only covers only Africa. I have also checked by changing mp_physics 1,3,6 for different IC & BC. But, nothing solves the issue. Required things are attached.

Why does it happen? What can i do to solve this issue?

Thanks in advance.
Rabbani

 

[Ming Chen]

Rabbani,
I have a few concerns of your namelist.input options:
(1) the time step of 30 is too small for 9km resolution.
(2) sf_surface_physics =0 is not a reasonable option. Please specify the surface scheme for your case.
(3) radt = 4 should be changed to radt =9
(4) please try the following options:
mp_physics = 8,
ra_lw_physics =4,
ra_sw_physics = 4,

 

[rabbanidu93]

Thank you Ming Chen, the issue is solved using your suggested combination of @physics.