USTAR

[21marta]

Hi,

Can you help me find where USTAR is calculated?(I am using MYJSFC surface scheme.
Because in the MODULE_SF_MYJSFC it is taken from somewhere.

 

[Ming Chen]

It is updated in PBL scheme. Please look into codes related to the PBL scheme you specify.

 

[21marta]

But what if I have bl_pbl_physics set to 0?

 

[Ming Chen]

If you set isfflx = 1 or 2, then ustar will be calculated in sfclay routine. If isfflx = 0, ustar will not be calculated.

 

[21marta]

I ahve isfflx set to 1 so according to you the USTAR is calculated in sfclay routine, which in my setup is myjsfc. From where then is the USTAR value taken in module_sf_myjsfc?

 

[n1o1o3n]

Dear 21marta

Hi, I was struggling with the similar problem, when using WRFv3.8.1.
But Ming Chen provided me a revised driver file, which enables to use Ustar calculated in sfclay routine.

After checking the difference of driver file between WRFv3.8.1 and WRFv4.0.2, I found that the mechanism had been incorporated into WRFv4.

So I guess you are using WRFv3.
Following URL shows the detail.

http://forum.mmm.ucar.edu/phpBB3/viewtopic.php?f=40&t=410

I am happy if it makes sense.

Best