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Run ideal TCs with a different sst

Y

Yuchen Kang

New member
Hello, I'm trying to run some ideal TC runs with different sst (the default is 28°). However, by changing the module_initialize_tropical_cyclone.F, recompiling, ./ideal.exe, ./wrf.exe, I find my TC to be completely not developing from the initial seedling. I'm not trying to run a time varying sst, so I'm not sure if my process is wrong somewhere. Is there some other part (aside from sounding) that I need to edit?
 
Ming Chen said:
How did you change SST?
Click to expand...
I change by go to module_initialize_tropical_cyclone.F, the user setting part:
!-----------------------------------------------------------------------
! USER SETTINGS

! Parameters for analytic vortex:
! Reference: Rotunno and Emanuel, 1987, JAS, p. 549

r0 = 412500.0 ! outer radius (m)
rmax = 82500.0 ! approximate radius of max winds (m)
vmax = 15.0 ! approximate value of max wind speed (m/s)
zdd = 20000.0 ! depth of vortex (m)


! other settings:

fcor = 5.0e-5 ! Coriolis parameter (1/s)
sst = 28.0 ! sea-surface temperature (Celsius)
 
Ming Chen said:
These options you posted are the same as the default ....
Click to expand...
Hi, so I have tried changing that sst to 29, 30, and 27. Wrf successfully generates the wrfinput file, but the cyclone does not develop at all when I actually run it. I thus wonder if the way I change sst is wrong.
 
Hi,

Are you able to run the default case and successfully generate the vortex?

As for the SST change, I believe you did it correctly. The only issue is that, once you changed SST but didn't change the input sounding, it may take longer time for the vortex to develop.

The best practice is to change both SST and input sounding simultaneously. In general, 1-degree T increase should correspond to 7% moisture increase ( just a rough estimate). I dimly remember a paper actually described such kind of sensitivity tests, but I just couldn't find that paper.

Hope this is helpful for you. Let me know whether the default option works for you. Thanks.
 
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